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- W2020616365 abstract "Dipolar addition of diazocarbonyl compounds to α,β-unsaturated esters and nitriles in the presence of pyridine results in the production of 2-pyrazolines in nearly quantitative yields. In one case, reaction of α-diazoacetophenone with acrylonitrile, Michael addition of the 2-pyrazoline to the conjugated olefin is observed, but this process is minimized by limiting the amount of pyridine employed. 5-Cyano-2-pyrazolines are converted to derivative pyrazoles through alkoxide promoted hydrogen cyanide elimination. With vinyl sulfone, α-diazoacetophenone undergoes sequential dipolar addition, Michael addition, and vinyl sulfite elimination under exceptionally mild conditions to form the derivative β-(1-pyrazolyl)ethyl vinyl sulfone in good yield." @default.
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- W2020616365 date "1983-07-01" @default.
- W2020616365 modified "2023-10-14" @default.
- W2020616365 title "Effective methods for the syntheses of 2-pyrazolines and pyrazoles from diazocarbonyl compounds" @default.
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- W2020616365 doi "https://doi.org/10.1002/jhet.5570200418" @default.
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