Timing of hydrogen randomization in substituted diphenyl acetylenes
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The mass spectra of halogenosubstituted diphenylacetylenes show hydrogen scrambling between the two phenyl rings. As with the halogenobenzenes the randomization process occurs i the molecular ion rather than in the [M 1] ion as is the case for methyldiphenylacetylene (I, = CH 3 ). Copyright 1970 Heyden & Son Ltd.