75557-42-5Relevant articles and documents
Unusual C=C bond migration in 3-ylidene-2,5-piperazinediones
Jin, Shangde,Wessig, Pablo,Liebscher, Ju?rgen
, p. 1993 - 1999 (2007/10/03)
Treatment of 3-alkylidene or 3-benzylidene-2,5-piperazinediones 6 with catalytic amounts of acid gives rise to the formation of isomers 7 by migration of the C=C bond into the alkyl substituent at position 6, or results in mixtures of racemic 7 and E isomers 8. The existence of tautomeric equilibria is discussed.