Synthesis and Reactivity of the First Isolated Hydrogen-Bridged Silanol-Silanolate Anions

Overview

Journal Angew Chem Int Ed Engl

Specialty Chemistry

Date 2019 Dec 14

PMID 31833629

Citations 13

Authors

Robin F Weitkamp

Beate Neumann

Hans-Georg Stammler

Berthold Hoge

Affiliations

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Abstract

We report on the first examples of isolated silanol-silanolate anions, obtained by utilizing weakly coordinating phosphazenium counterions. The silanolate anions were synthesized from the recently published phosphazenium hydroxide hydrate salt with siloxanes. The silanol-silanolate anions are postulated intermediates in the hydroxide-mediated polymerization of aryl and alkyl siloxanes. The silanolate anions are strong nucleophiles because of the weakly coordinating character of the phosphazenium cation, which is perceptible in their activity in polysiloxane depolymerization.

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