What kind of challenge would you like to see in a future of compound:m-Methoxyphenol

Recommanded Product: m-Methoxyphenol. About m-Methoxyphenol, If you have any questions, you can contact Deng, XL; Zheng, WN; Jin, C; Bai, LY or concate me.

An article Synthesis of Novel 6-Aryloxy-4-chloro-2-phenylpyrimidines as Fungicides and Herbicide Safeners WOS:000575417400054 published article about ANTIFUNGAL ACTIVITY; DESIGN; PYRIMETHANIL; DERIVATIVES; INHIBITOR in [Deng, Xile; Zheng, Wenna; Jin, Can; Bai, Lianyang] Hunan Acad Agr Sci, Hunan Agr Biotechnol Res Inst, Key Lab Biol & Control Weeds, Changsha 410125, Peoples R China in 2020, Cited 68. Recommanded Product: m-Methoxyphenol. The Name is m-Methoxyphenol. Through research, I have a further understanding and discovery of 150-19-6

Fenclorim is a commercial herbicide safener with fungicidal activity used for chloroacetanilide herbicides, which might be suitable as a lead compound for screening novel fungicides. However, little has been reported so far on the structure-activity relationship of fungicidal activities of fenclorim or its analogues. Here, a series of 4-chloro-6-substituted phenoxy-2-phenylpyrimidine derivatives was synthesized by a substructure splicing route using fenclorim as a lead compound. The structures of synthesized derivatives were characterized by H-1 NMR, C-13 NMR, and HRMS. Their fungicidal and herbicide safening activities were then evaluated. The results revealed that compound 11 had the best fungicidal activity against Sclerotinia sclerotiorum and Thanatephorus cucumeris, which was better than that of the control pyrimethanil. Moreover, compounds 3, 5, and 25 exhibited excellent safening activities against fresh weight, plant height, and root length, respectively. Such activities were significantly improved when compared to fenclorim. In summary, these findings look promising for the preparation of new fungicides and herbicide safeners based on the structure of fenclorim.

Recommanded Product: m-Methoxyphenol. About m-Methoxyphenol, If you have any questions, you can contact Deng, XL; Zheng, WN; Jin, C; Bai, LY or concate me.

Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Awesome and Easy Science Experiments about C7H8O

HPLC of Formula: C7H8O. About Benzyl Alcohol, If you have any questions, you can contact Zhong, R; Wei, ZY; Zhang, W; Liu, S; Liu, Q or concate me.

HPLC of Formula: C7H8O. In 2019.0 CHEM-US published article about ASYMMETRIC TRANSFER HYDROGENATION; C-H; SELECTIVE HYDROGENATION; IRON CATALYSTS; PRIMARY AMINES; COMPLEXES; LIGAND; (DE)HYDROGENATION; REDUCTION; NITRILES in [Zhong, Rui; Wei, Zeyuan; Zhang, Wei; Liu, Qiang] Tsinghua Univ, Dept Chem, CBMS, Beijing 100084, Peoples R China; [Liu, Shun] Wuyi Univ, Sch Biotechnol & Hlth Sci, Jiangmen 529090, Guangdong, Peoples R China in 2019.0, Cited 60.0. The Name is Benzyl Alcohol. Through research, I have a further understanding and discovery of 100-51-6.

Homogeneous catalytic hydrogenation of carbonyl groups is a synthetically useful and widely applied organic transformation. Sustainable chemistry goals require replacing conventional noble transition metal catalysts for hydrogenation by earth-abundant base metals. Herein, we report how a practical in situ catalytic system generated by easily available pincer NHC precursors, CoCl2, and a base enabled efficient and high-yielding hydrogenation of a broad range of ketones and aldehydes (over 50 examples and a maximum turnover number [TON] of 2,610). This is the first example of NHC-Co-catalyzed hydrogenation of C=O bonds using flexible pincer NHC ligands consisting of a N-H substructure. Diastereodivergent hydrogenation of substituted cyclohexanone derivatives was also realized by fine-tuning of the steric bulk of pincer NHC ligands. Additionally, a bis(NHCs)-Co complex was successfully isolated and fully characterized, and it exhibits excellent catalytic activity that equals that of the in-situ-formed catalytic system.

HPLC of Formula: C7H8O. About Benzyl Alcohol, If you have any questions, you can contact Zhong, R; Wei, ZY; Zhang, W; Liu, S; Liu, Q or concate me.

Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Chemical Properties and Facts of 123-11-5

Formula: C8H8O2. About 4-Methoxybenzaldehyde, If you have any questions, you can contact Goncalves, P; Peeraer, A; Adriaenssens, Y; Zonnekein, L; Franck, P; Maes, BUW; Augustyns, K; Van der Veken, P or concate me.

Recently I am researching about SULFINIC ACIDS ALDEHYDE; IN-SITU GENERATION; MULTICOMPONENT REACTIONS; AMIDO SULFONES; MANNICH CONDENSATION; ETHYL CARBAMATE; INHIBITORS; PRECURSORS; NITRILES; IMINES, Saw an article supported by the Fund for Scientific Research-Flanders (FWO-Vlaanderen)FWO. Formula: C8H8O2. Published in AMER CHEMICAL SOC in WASHINGTON ,Authors: Goncalves, P; Peeraer, A; Adriaenssens, Y; Zonnekein, L; Franck, P; Maes, BUW; Augustyns, K; Van der Veken, P. The CAS is 123-11-5. Through research, I have a further understanding and discovery of 4-Methoxybenzaldehyde

The Strecker reaction is a three-component condensation of an aldehyde, an amine, and hydrogen cyanide, delivering an a-amino carbonitrile. Despite extensive investigations, the possibility to use amides instead of amines as one of the three condensation partners has been largely neglected. Nonetheless, the N-acylated alpha-aminocarbonitriles that are obtained in this way are of direct interest for drug discovery, because they make up a well-known class of mechanism-based inhibitors of serine- and cysteine-type hydrolases. In response, we have thoroughly explored the corresponding variant of the Strecker reaction, focusing on catalyst use, solvent, reaction time, and cyanide source. Optimized parameters were combined in a sequential one-pot protocol for which the scope was found to be compatible with library synthesis applications. Product yields ranged from 7 to 90%, and conditions were found to be mild and tolerant to a wide range of functional groups, including moieties that are typically present in druglike molecules.

Formula: C8H8O2. About 4-Methoxybenzaldehyde, If you have any questions, you can contact Goncalves, P; Peeraer, A; Adriaenssens, Y; Zonnekein, L; Franck, P; Maes, BUW; Augustyns, K; Van der Veken, P or concate me.

Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Final Thoughts on Chemistry for m-Methoxyphenol

Computed Properties of C7H8O2. About m-Methoxyphenol, If you have any questions, you can contact Li, CC; Nakagawa, Y; Tamura, M; Nakayama, A; Tomishige, K or concate me.

An article Hydrodeoxygenation of Guaiacol to Phenol over Ceria-Supported Iron Catalysts WOS:000608850500023 published article about VAPOR-PHASE HYDRODEOXYGENATION; TOTAL-ENERGY CALCULATIONS; MODEL COMPOUNDS; SELECTIVE HYDRODEOXYGENATION; MOSSBAUER-SPECTROSCOPY; FE CATALYSTS; BIO-OIL; LIGNIN; REDUCTION; HYDROGENATION in [Li, Congcong; Nakagawa, Yoshinao; Tomishige, Keiichi] Tohoku Univ, Sch Engn, Dept Appl Chem, Sendai, Miyagi 9808579, Japan; [Tamura, Masazumi] Osaka City Univ, Adv Res Inst Nat Sci & Technol, Res Ctr Artificial Photosynth, Osaka 5588585, Japan; [Nakayama, Akira] Univ Tokyo, Grad Sch Engn, Dept Chem Syst Engn, Tokyo 1138656, Japan; [Nakagawa, Yoshinao; Tomishige, Keiichi] Tohoku Univ, Res Ctr Rare Met & Green Innovat, Sendai, Miyagi 9808579, Japan in 2020.0, Cited 82.0. The Name is m-Methoxyphenol. Through research, I have a further understanding and discovery of 150-19-6. Computed Properties of C7H8O2

Guaiacol, one of the main components and a model compound of lignin-derived bio-oil, was transformed into phenol and methylated phenols over a series of supported iron catalysts under atmospheric pressure. CeO2 support was superior to other conventional supports in view of the activity of supported iron catalysts. The effect of iron loading amount on CeO2 supports showed a linear relationship with an iron loading amount up to 3 wt %, which corresponded to monolayer coverage, and then it was almost constant with a further increase of the iron content. The Fe/CeO2 catalyst with 3 wt % iron loading (Fe(3)/CeO2) had higher stability than the catalysts with higher iron loadings. The optimal Fe(3)/CeO2 catalyst showed a 56% phenol yield and an 87% sum yield of phenol and methylated phenols at 673 K under guaiacol/N-2/H-2 = 1/45/135 flow with W/F = 1.0 g.h.mol(total)(-1). The X-ray diffraction (XRD), diffuse reflectance UV-visible (DRUV-vis), Raman, and X-ray absorption spectroscopy (XAS) characterizations confirmed that the FeOx species were finely dispersed on the Fe/CeO2 catalyst with <= 3 wt % iron, and higher iron loadings led to formation of Fe2O3 particles in calcined catalysts. Although other supported iron catalysts with 3 wt % iron loading also contained dispersed FeOx species, the reducibility of Fe/CeO2 was higher than that of other supported iron catalysts, which might be related to the higher activity. The XAS characterization of spent catalysts showed that the stable Fe(3)/CeO2 catalyst contained only Fe3+ and Fe2+ species during the reaction, while in the Fe(10)/CeO2 catalyst, the reduction of iron proceeded to a greater extent and Fe3C crystals grew during the reaction. The structure of this monolayer Fe(3)/CeO2 was further characterized by extended X-ray absorption fine structure (EXAFS) and density functional theory (DFT) calculations. Rather than a two-dimensional Fe oxide sheet, a structure composed of dispersed Fe4O6 clusters is suggested for monolayer coverage. The coordinatively unsaturated site (CUS) in the interface between FeOx and reducible CeO2 is suggested to be the active site. Computed Properties of C7H8O2. About m-Methoxyphenol, If you have any questions, you can contact Li, CC; Nakagawa, Y; Tamura, M; Nakayama, A; Tomishige, K or concate me.

Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Archives for Chemistry Experiments of Mequinol

About Mequinol, If you have any questions, you can contact Zhao, GZ; Gao, QD; Hadiatullah, H; Zhang, J; Zhang, AL; Yao, YP or concate me.. Recommanded Product: 150-76-5

In 2021.0 LWT-FOOD SCI TECHNOL published article about MAILLARD REACTION-PRODUCTS; MICROCRYSTALLINE CELLULOSE; IMPACT; ACID; OPTIMIZATION; BIOREFINERY; HYDROLYSIS in [Zhao, Guozhong; Gao, Qidou; Hadiatullah, Hadiatullah; Zhang, Ailin; Yao, Yunping] Tianjin Univ Sci & Technol, Coll Food Sci & Engn, State Key Lab Food Nutr & Safety, Key Lab Food Nutr & Safety,Minist Educ, Tianjin 300457, Peoples R China; [Zhao, Guozhong; Gao, Qidou] Minist Educ, Engn Res Ctr Food Biotechnol, Tianjin 300457, Peoples R China; [Zhang, Jian] Tianjin Tianfeng Zetian Biotechnol Co Ltd, Tianjin 300457, Peoples R China; [Zhang, Ailin] Tianjin Agr Univ, Dept Food Sci & Biotechnol, Tianjin 300384, Peoples R China in 2021.0, Cited 38.0. The Name is Mequinol. Through research, I have a further understanding and discovery of 150-76-5. Recommanded Product: 150-76-5

Wheat bran, which contains a large amount of cellulose, is used as a raw material to produce soy sauce, but it is hard to degrade during fermentation. Steam explosion (SE) is efficient in hydrolyzing the cellulose for enhancing enzymatic digestion and solvent accessibility. In this study, we applied a SE at a sufficiently high pressure to damage the integrity of the wheat bran structure and modify it to assume a layered form. We found that cellulose, hemicellulose, and lignin structures were collapsed by SE pretreatment, which was indicated by their changes in Fourier transform infrared spectroscopy (FTIR). The amounts of cellulose, hemicellulose, and lignin decreased by 5.8%, 21.4%, and 43.4%, respectively, under 1.5 MPa, resulting in the significant reduction of sugar and amino acid nitrogen. The co-reaction of nonenzymatic browning after SE pretreatment resulted in an intense increase in flavor (overall feeling), as determined by electronic nose analysis and sensory evaluation. In conclusion, SE pretreatment under 1.0 MPa was proven to be the most optimal state for the production of aroma compounds (volatile compounds), which are essential for soy sauce production.

About Mequinol, If you have any questions, you can contact Zhao, GZ; Gao, QD; Hadiatullah, H; Zhang, J; Zhang, AL; Yao, YP or concate me.. Recommanded Product: 150-76-5

Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

New explortion of C7H8O

Computed Properties of C7H8O. About Benzyl Alcohol, If you have any questions, you can contact Markushyna, Y; Teutloff, C; Kurpil, B; Cruz, D; Lauermann, I; Zhao, YB; Antonietti, M; Savateev, A or concate me.

Computed Properties of C7H8O. Markushyna, Y; Teutloff, C; Kurpil, B; Cruz, D; Lauermann, I; Zhao, YB; Antonietti, M; Savateev, A in [Markushyna, Yevheniia; Kurpil, Bogdan; Cruz, Daniel; Zhao, Yubao; Antonietti, Markus; Savateev, Aleksandr] Max Planck Inst Colloids & Interfaces, Dept Colloid Chem, Res Campus Golm, D-14424 Potsdam, Germany; [Teutloff, Christian] Free Univ Berlin, Dept Phys, D-14195 Berlin, Germany; [Lauermann, Iver] Helmholtz Zentrum Berlin Mat & Energie HZB, D-14109 Berlin, Germany published Halogenation of aromatic hydrocarbons by halide anion oxidation with poly (heptazine imide) photocatalyst in 2019.0, Cited 38.0. The Name is Benzyl Alcohol. Through research, I have a further understanding and discovery of 100-51-6.

Halocarbons have tremendous significance for the chemical industry. Arylchlorides and arylbromides are typically prepared via Friedel-Crafts reaction, using oxidative halogenation or employing halogen transfer agents, such as N-chloro- and N-bromosuccineimide. Herein, we show that K-PHI, a photocatalyst of the carbon nitride family, can easily photooxidize halide anions (Cl- Br- ) in aqueous media to promote oxidative halogenation of electron rich aromatic compounds. The technique is convenient, safe and gives the haloaromatic products with excellent yields from non-harmful starting reagents in the most sustainable fashion. We show that a solution of NaCl, mimicking seawater, can be used as a reagent for photochlorination.

Computed Properties of C7H8O. About Benzyl Alcohol, If you have any questions, you can contact Markushyna, Y; Teutloff, C; Kurpil, B; Cruz, D; Lauermann, I; Zhao, YB; Antonietti, M; Savateev, A or concate me.

Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Final Thoughts on Chemistry for C8H8O2

Application In Synthesis of 4-Methoxybenzaldehyde. About 4-Methoxybenzaldehyde, If you have any questions, you can contact Jia, WL; Ces, SV; Fernandez-Ibanez, MA or concate me.

An article Divergent Total Syntheses of Yaequinolone-Related Natural Products by Late-Stage C-H Olefination WOS:000649101400020 published article about INSECTICIDAL ANTIBIOTICS; PENICILLIUM SP; ASPERGILLUS-NIDULANS; ALKALOIDS; DERIVATIVES; MARINE in [Jia, Wen-Liang; Ces, Sabela Vega; Fernandez-Ibanez, M. Angeles] Univ Amsterdam, Vant Hoff Inst Mol Sci, NL-1098 XH Amsterdam, Netherlands in 2021.0, Cited 41.0. Application In Synthesis of 4-Methoxybenzaldehyde. The Name is 4-Methoxybenzaldehyde. Through research, I have a further understanding and discovery of 123-11-5

Divergent total syntheses of 10 yaequinolone-related natural products have been achieved for the first time by latestage C-H olefination of 3,4-dioxygenated 4-aryl-5-hydroxyquinolin-2(1H)-ones, core structures of this family of natural products. A robust synthetic methodology to construct the core structures has been established, and the C-H olefination reaction has been carried out with synthetically useful yields and high levels of site-selectivity under mild reaction conditions in the presence of a Pd/S,O-ligand catalyst.

Application In Synthesis of 4-Methoxybenzaldehyde. About 4-Methoxybenzaldehyde, If you have any questions, you can contact Jia, WL; Ces, SV; Fernandez-Ibanez, MA or concate me.

Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Extended knowledge of Benzyl Alcohol

About Benzyl Alcohol, If you have any questions, you can contact Xu, JB; Liu, N; Zou, LL; Cheng, FX; Shen, XF; Liu, T; Lv, HP; Khan, R; Fan, BM or concate me.. Recommanded Product: Benzyl Alcohol

I found the field of Chemistry very interesting. Saw the article Visible-Light Driven Hydrolysis of Benzyl Halides with Water for Preparation of Benzyl Alcohols published in 2019. Recommanded Product: Benzyl Alcohol, Reprint Addresses Xu, JB (corresponding author), Qujing Normal Univ, Yunnan Guizhou Plateau Chem Funct Mat Pollut Cont, Qujing 655011, Peoples R China.; Fan, BM (corresponding author), Yunnan Minzu Univ, Key Lab Chem Ethn Med Resources, YMU HKBU Joint Lab Tradit Nat Med, Kunming 650500, Yunnan, Peoples R China.. The CAS is 100-51-6. Through research, I have a further understanding and discovery of Benzyl Alcohol

Visible-light-mediated hydrolysis of benzyl halides has been achieved that is efficiently catalyzed by metal-free catalyst rhodamine B. Benzyl bromides and chlorides can smoothly react with water to prepare a series of benzyl alcohol compounds in good yields.

About Benzyl Alcohol, If you have any questions, you can contact Xu, JB; Liu, N; Zou, LL; Cheng, FX; Shen, XF; Liu, T; Lv, HP; Khan, R; Fan, BM or concate me.. Recommanded Product: Benzyl Alcohol

Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

Why do aromatic interactions matter of compound:99-93-4

Computed Properties of C8H8O2. About 4′-Hydroxyacetophenone, If you have any questions, you can contact Xu, X; Tao, N; Fan, WT; Tu, GL; Geng, JY; Zhang, JY; Zhao, YS or concate me.

Authors Xu, X; Tao, N; Fan, WT; Tu, GL; Geng, JY; Zhang, JY; Zhao, YS in AMER CHEMICAL SOC published article about in [Xu, Xu; Tao, Na; Fan, Wei-Tai; Tu, Guangliang; Geng, Jingyao; Zhao, Yingsheng] Soochow Univ, Coll Chem Chem Engn & Mat Sci, Key Lab Organ Synth Jiangsu Prov, Suzhou 215123, Peoples R China; [Zhang, Jingyu] Soochow Univ, Coll Energy, Soochow Inst Energy & Mat Innovat, Suzhou 215006, Peoples R China in 2020.0, Cited 52.0. Computed Properties of C8H8O2. The Name is 4′-Hydroxyacetophenone. Through research, I have a further understanding and discovery of 99-93-4

With pyrimidine as the directing group, we achieved the meta-selective difluoromethylation of phenol derivatives using ruthenium as a catalyst. This synthetic scheme provided an efficient method for the syntheses of fluorine-containing phenol derivatives. A wide variety of phenol derivatives were well-suited, affording the corresponding products in moderate-to-good yields.

Computed Properties of C8H8O2. About 4′-Hydroxyacetophenone, If you have any questions, you can contact Xu, X; Tao, N; Fan, WT; Tu, GL; Geng, JY; Zhang, JY; Zhao, YS or concate me.

Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

An overview of features, applications of compound:Benzyl Alcohol

About Benzyl Alcohol, If you have any questions, you can contact Pahari, SK; Doong, RA or concate me.. Name: Benzyl Alcohol

Name: Benzyl Alcohol. Recently I am researching about C-H BONDS; BLACK PHOSPHORUS; SOLVENT-FREE; ACTIVATION; FUNCTIONALIZATION; NANOSTRUCTURE; BENZALDEHYDE; EVOLUTION; AMBIENT; GAP, Saw an article supported by the Ministry of Science and Technology (MOST), TaiwanMinistry of Science and Technology, Taiwan; MOST [107-2221-E-007-113-MY3, 108-2911-I-007-302MY3]. Published in AMER CHEMICAL SOC in WASHINGTON ,Authors: Pahari, SK; Doong, RA. The CAS is 100-51-6. Through research, I have a further understanding and discovery of Benzyl Alcohol

Herein, we have, for the first time, fabricated a few-layered phosphorene (FLP) and few-layered carbon nitride (FLCN) nano-heterostructure as a metal-free and broad solar light-absorbing photocatalyst for highly selective conversion of primary C-H bond of toluene and benzyl alcohol to benzaldehyde in the presence of oxygen. The FLP-FLCN photocatalyst can effectively oxidize benzyl alcohol to benzaldehyde with superior selectivity (>99%) under the visible light irradiation conditions. Moreover, a conversion rate of 82.6 mmol/(g h) from toluene to benzaldehyde is achieved after 24 h of photoreaction. The fine structural analysis including synchrotron-based X-ray absorption near-edge structure and photoelectron spectroscopy and electrochemistry signifies that the enhanced photocatalytic activity of FLP-FLCN is mainly contributed from the synergistic electronic coupling at the FLP-FLCN interface. The photogenerated hole-electron pairs and superoxide anion radicals play a crucial role in facilitating the C-H oxidation reaction. In addition, the FLP-FLCN can be reused for at least five cycles to efficiently photocatalytic conversion of benzyl alcohol without obvious loss of photocatalytic activity and microstructures. These findings provide a novel strategy to synthesize a metal-free nanocatalyst for the visible-light-driven photocatalytic conversion of specific organic transformation with high selectivity and superior conversion rate.

About Benzyl Alcohol, If you have any questions, you can contact Pahari, SK; Doong, RA or concate me.. Name: Benzyl Alcohol

Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles