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Migration tendencies of functional groups toward sigmatropic rearrangement in 3,3-disubstituted 3H-pyrazoles

✍ Scribed by Peter Sciess; Henri Stalder

Book ID: 104225484
Publisher: Elsevier Science
Year: 1980
Tongue: French
Weight: 257 KB
Volume: 21
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(00)92734-5

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✦ Synopsis

Disubstituted 3H-pyrazoles la -e aromatise through an intramolecular sigmatropic 1,5-(1,2-)shift of one ofthe 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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