Scheme 1
From: N-heteroatom substitution effect in 3-aza-cope rearrangements

Synthesis and thermal rearrangement of N -propargyl pyrazolin-5-ones 1 and their isomers 2.
From: N-heteroatom substitution effect in 3-aza-cope rearrangements
Synthesis and thermal rearrangement of N -propargyl pyrazolin-5-ones 1 and their isomers 2.