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Flash Vacuum Pyrolysis and Photolysis of 3,3,5,5-Tetramethylpyrazolin-4-one - A Matrix Isolation Study

✍ Scribed by Wolfram Sander; Roman Wrobel; Peter Komnick; Paul Rademacher; Heidi M. Muchall; Helmut Quast

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 337 KB
Volume: 2000
Category: Article
ISSN: 1434-193X
DOI: 10.1002/(sici)1099-0690(200001)2000:1<91::aid-ejoc91>3.0.co;2-c

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✦ Synopsis

The flash vacuum pyrolysis of 3,3,5,5-tetramethylpyrazolin-oxide 9 as the major products. The reaction of tetramethylallene 13 with oxygen atoms yields the same 4-one (4) with subsequent trapping of the products in argon at 10 K results in the formation of a complex product mixture product mixture of 5 and 9 and thus provides an independent route to these species. The experimental IR spectra of 5 and with tetramethylcyclopropanone (5) as one of the minor constituents. The 193 nm photochemistry of matrix-isolated 9 are in good agreement with the results from DFT calculations. 4 is much cleaner, yielding cyclopropanone 5 and allene

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