Flash vacuum thermolysis
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
---The flash vacuum pyrolysis of 3,3,5,5-tetramethylpyrazolin-4-one (4) with subsequent trapping of the products in argon at 10 K results in the formation of a complex product mixture with tetramethylcyclopropanone (5) as one of the minor constituents. The 193 nm photochemistry of matrix-isolated 4 is much cleaner, yielding cyclopropanone 5 and allene oxide 9 as the major products. The reaction of tetramethylallene 13 with oxygen atoms yields the same product mixture of 5 and 9 and thus provides an independent route to these species. The experimental IR spectra of 5 and 9 are in good agreement with the results from DFT calculations.Supporting information for this article is available on the WWW under //http://www.wiley-vch.de/contents/jc_2046/2000/99377_s.pdf or from the author.
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