Abstract
Preparation of some bis(trialkylstannyl)acetylenes from the corresponding trialkylstannyl chlorides was improved. The tin reagents interact with reactive acid chlorides and bromides to afford intermediate 1-acyl-2-trialkylstannylacetylenes in quantitative yields. The subsequent halogenation performed as a one-pot procedure gives the target 1-acyl-2-haloacetylenes in high yields and provides an effective recycling of the expensive starting trialkylstannyl chlorides.
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