Tetrahedron Letters p. 1417 - 1420 (1980)
Update date:2022-08-04
Topics:
Schiess, Peter
Stalder, Henri
3,3-Disubstituted 3H-pyrazoles la - e aromatise through an intramolecular sigmatropic 1,5-(1,2-)shift of one of the quaternary groups.From a kinetic study of the uncatalysed and of the acid catalysed isomerisation reaction migration tendencies of functional groups in sigmatropic rearrangement toward neutral and toward cationic centers are obtained.
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(1969)
