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Abstract
The compounds (1) formed by the addition of arsenic trichloride to phenylacetylenes contain several reactive sites and hence are useful synthetic intermediates. We have prepared these compounds in high yield by this route and have examined certain of their properties. The vinylic chlorine, generally stable to reduction, may be quantitatively and readily reduced using a lithium aluminium hydride-lithium hydride mixture. The chlorine atoms attached to arsenic are extremely reactive and readily hydrolysed and hence precautions must be taken to exclude atmospheric moisture from the reaction system. The chlorine atoms will also react on treatment with a Grignard reagent to give the diphenylstyrylarsine (2)