REARRANGEMENTS AND CYCLIZATIONS - XIV. RING-OPENING REACTIONS OF 1,1-DIACETYLCYCLOPROPANE WITH HYDRAZINE AND HYDROXYLAMINE DERIVATIVES AS THE NOVEL SYNTHESIS OF Β-X-ETHYL SUBSTITUTED PYRAZOLES AND ISOXAZOLES

Article abstract of DOI:10.1016/0040-4020(82)80149-X

The reactions of 1,1-diacetylcyclopropane (1) with a number of hydrazine and hydroxylamine derivatives proceed via cyclopropane ring opening with incorporation of external nucleophile (solvent) to give the 4-β-X-ethyl derivatives of 3,5-dimethylpyrazoles