Abstract
The structures of the C 3H 5Mg intermediates formed in the reactions of propyne and allene on magnesium films were determined by converting them into propene- d 1 compounds, which were analyazed by microwave spectrometry. Propyne gives mainly the ( É)-n-propenyl intermediate. Allene, although largely isomerized to propyned before reaction, gives both allyl and 2-propenyl intermediates, with the first slightly predominant. The formation of these intermediates is assumed to involve hydrometalation of propyne and allene by magnesium hydride.
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