Regio-and stereo-specific reduction of conjugated and non-conjugated triple bonds by activated zinc powder

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Abstract
Regio-as well as stereo-specific reductions of a wide variety of acetylenic derivatives have been carried out in absolute ethanol with zinc powder activated with 1,2-dibromoethane, and with zinc powder activated successively with dibromoethane and copper(I) bromide, the first reagent less powerful and more selective than the second one.