Flash-vacuum pyrolysis of the benzylidene compound (2) gives acetone and phenylacetylene (98%); 13C labelling shows that the presumed intermediate benzylidenecarbene (3) appears to undergo 75% of hydrogen migration and 25% of phenyl migration at 560°.
R. F. C. Brown and K. J. Harrington, J. Chem. Soc., Chem. Commun., 1972, 1175 DOI: 10.1039/C39720001175
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