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An Alkenyl Boronate as a Monomer for Radical Polymerizations: Boron as a Guide for Chain Growth and as a Replaceable Side Chain for Post-Polymerization Transformation

An Alkenyl Boronate as a Monomer for Radical Polymerizations: Boron as a Guide for Chain Growth and as a Replaceable Side Chain for Post-Polymerization Transformation

Tsuyoshi Nishikawa, Makoto Ouchi

Angew Chem Int Ed Engl. 2019 Sep 2;58(36):12435-12439.

PMID: 31283869

Abstract:

The ability of isopropenyl boronate pinacol ester to serve as a monomer in radical polymerizations was established and exploited for the synthesis of polymers that are difficult to access using other polymerization techniques. Although the monomer exhibits an α-methyl-substituted unconjugated structure, which is usually unfavorable for radical propagation, both free and controlled radical polymerizations smoothly afford the corresponding polymers. A density-functional-theory-based investigation revealed that the boron atom moderately stabilizes the radical species, which leads to the suppression of the degradative chain transfer to the α-methyl groups, and thus guides the reaction towards the radical polymerization. The boronyl pendants, which are directly attached to the polymer backbone, can be replaced with -OH or -NH2 to yield poly(α-methyl vinyl amine) or poly(α-methyl vinyl alcohol), which has been inaccessible by conventional synthetic methods.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS793421	methyl 3-amino-5-boronobenzoate, pinacol ester			Price

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