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Revisiting the Polymerization of Diphenylacetylenes With Tungsten(VI) Chloride and Tetraphenyltin: An Alternative Mechanism by a Metathesis Catalytic System

Revisiting the Polymerization of Diphenylacetylenes With Tungsten(VI) Chloride and Tetraphenyltin: An Alternative Mechanism by a Metathesis Catalytic System

Mami Miyairi, Tsuyoshi Taniguchi, Tatsuya Nishimura, Katsuhiro Maeda

Angew Chem Int Ed Engl. 2020 May 25.

PMID: 32452139

Abstract:

An alternative reaction mechanism of the polymerization of diphenylacetylelnes using a catalytic system composed of tungsten(VI) chloride and tetraphenyltin has been proposed through the optimization of reaction conditions and investigation of the effect of the electronic nature of diphenylacetylene monomers on the polymerizability. The detailed structures of the polymers have been suggested by mass spectrometric analysis of the obtained polymers and oligomers, which suggested that a phenyl group of tetraphenyltin has been introduced to an initiating end of the polymer chain. Mass spectrometric analysis also provided information about the termination processes of the polymerization. The experimental results strongly suggested that the polymerization of diphenylacetylenes using tungsten(VI) chloride and tetraphenyltin proceeds through a migratory insertion mechanism rather than the long-accepted metathesis mechanism.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP13283017	Tungsten(VI) chloride		13283-01-7	Price

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