SCHEDULED MAINTENANCE
The optically active 2-E-benzylidene-4-t-butyl 4-cyano-3-phenylcyclobutanone (1) rearranges thermally to the 2-Z-benzylidene isomer (3) by a [1,3]sigmatropic shift with inversion of the migrating centre; a further thermal isomerisation of (3) is also described.
H. A. Bampfield, P. R. Brook and K. Hunt, J. Chem. Soc., Chem. Commun., 1976, 146 DOI: 10.1039/C39760000146
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