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Angew Chem Int Ed Engl. 2020 Mar 27;59(14):5494-5499. doi: 10.1002/anie.201914339. Epub 2020 Feb 11.

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

Author information

1
Centrum für Molekulare Materialien, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, 33615, Bielefeld, Germany.

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.

KEYWORDS:

phosphazene; silanolates; silicone; siloxanes; weakly coordinating cations

PMID:
31833629
DOI:
10.1002/anie.201914339

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