Flash vacuum pyrolysis of 1-propynoylpyrazoles: a new precursor of tricarbon monoxide |
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| Authors: | Roger FC Brown Peter D Godfrey Swee Choo Lee |
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| Institution: | Department of Chemistry, Monash University, Clayton, Vic. 3168, Australia |
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| Abstract: | Pyrolysis of 3,5-dimethyl-1-propynoylpyrazole (1) at 640°C/0.1 torr gives 2-methyl-1-pyrazolo2,3-a]pyridin-5-one (3) with inversion of the propynoyl chain. 1-Ethynylpyrazole and tricarbon monoxide have been identified in pyrolysates formed at 700–1000°C/0.01–0.1 torr from the parent 1-propynoylpyrazole (4). |
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