Category: indole-building-block. Yoshida, K; Yamamoto, T; Tajima, K; Isono, T; Satoh, T in [Isono, Takuya; Satoh, Toshifumi] Hokkaido Univ, Grad Sch Chem Sci & Engn, Sapporo, Hokkaido 0808628, Japan; Hokkaido Univ, Fac Engn, Sapporo, Hokkaido 0808628, Japan published Installing a functional group into the inactive omega-chain end of PMMA and PS-b-PMMA by terminal-selective transesterification in 2019.0, Cited 52.0. The Name is Benzyl Alcohol. Through research, I have a further understanding and discovery of 100-51-6.
Polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) has been widely used as a nanotemplate material for the block copolymer lithography. Thus, development of a simple method to functionalize the inherently inactive PS-b-PMMA is of considerable interest to expand its potential applications. Herein, we demonstrate that titanium alkoxide-catalyzed transesterification can be a versatile chain-end functionalization method for proton-terminated PS-b-PMMA. Starting from anionically synthesized PMMA and PS-b-PMMA, the ester-side chain of the MMA unit at the omega-chain end was selectively transesterified in the presence of various alcohols with the aid of the corresponding titanium alkoxides to yield the end-functionalized PMMAs and PS-b-PMMAs. A wide range of alcohols containing various functional groups (e.g., alkyl chains, aromatic rings, and fluorocarbon chains) were utilized for terminal-selective transesterification. Clickable groups (e.g., pentafluorobenzyl and azido) were also successfully incorporated into the omega-terminal MMA unit, which serves as the reactive site for further modification. Importantly, even the hydroxy-functionalized polymer poly(ethylene glycol) monomethyl ether could be used for the terminal-selective transesterification of PS-b-PMMA, yielding a polystyrene-block-poly(methyl methacrylate)-block-poly(ethylene glycol) triblock terpolymer. The present transesterification system can be a powerful tool for chain-end functionalization of the inactive chain-end of PS-b-PMMA, providing insight into the effect of the chain-end structure on microphase separation behavior.
Category: indole-building-block. About Benzyl Alcohol, If you have any questions, you can contact Yoshida, K; Yamamoto, T; Tajima, K; Isono, T; Satoh, T 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