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Photochemistry of di-t-butyl ketone studied by NMR spectroscopy

✍ Scribed by M. Tomkeiwicz; A. Groen; M. Cocivera

Publisher
Elsevier Science
Year
1971
Tongue
English
Weight
410 KB
Volume
10
Category
Article
ISSN
0009-2614

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✦ Synopsis

HiOTCXHEMISTRY OF lM-r-NTYL KETONE Sl'UDIED BY MMR SPECTROSCOPY

we wish to report tie resrrfts of an NMR study of the detailed mechanism of the photofysis of di-t-butyl ketone in perfluoramethyfcyclohexane at room temperature using radiation with wave~en~ greater than 3CKl m. During the photolysis we have obsenred enhanced NMR emission and absorption &es, and our conclusions are bred on the analysis of these gectta, Pertinent spectra at 100 MHz are given in fig. 1. The spectra before, during and after apron are Welled B, D and A, respectively, and the field strength increases from left to right. In spectrum B, the intense line is the resonance of t&e CH,-protons of di+b~tyl ketone and the weaker lines down field are due to an impurity, and the s&m4 at high fIeM is an instrumental artifact. En spectrum D, three new sets of liqes appear. fn ad&&n, there is a line appearing at low field which is not an scale at this sweep width. As indicated in spectrum & tfiese lines cannot be detected after ir~&ation is stopped. FinaI!.y2 the four sets of lines :tppearing during. _ irradiation are3hown in more detail in the bottom spectrum, and t& order from left to r&h% corresponds tu increasing field &ength. The assignment of these fines is carbonyl hydrogia of piv&aIilehyde (a), v&y1 hydrogen of isobutytene (b), methyl hydrogen of $sobutylene (c) and met@ hydrogen of Z-Tethylpropane

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