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- W2061222512 abstract "Phenyl isothiocyanate reacts with butyraldazine in presence of acidic catalysts to form a 2-pyrazoline (IV) whereas phenyl or benzyl isocyanates under similar conditions yield a mixture of the two isomeric 2-pyrazolines XIa and XII. On reaction with Ac2O, IV gave the 1-acetyl derivative V. Reduction with LiAlH4 led to the corresponding pyrazolidines. Reexamination of Kost's three step preparation of a 1-phenylthiocarbamoyl 2-pyrazoline [19] such as X via formic acid cyclization [18] of butyraldazine revealed that his first step product was apparently a mixture of two stereoisomeric 1-formyl-2-pyrazolines VIIIa and VIIIb. A mechanism for the formation of these pyrazolines is proposed." @default.
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- W2061222512 title "Reaction of Isocyanates and Isothiocyanates with Butyraldazine; Formation of 1-Substituted 2-Pyrazolines" @default.
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- W2061222512 doi "https://doi.org/10.1002/hlca.19700530744" @default.
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