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The thermal and photochemical rearrangement of 1,2(4H)-diazepine derivatives
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The thermal and photochemical rearrangement of 1,2(4H)-diazepine derivatives
作者:
David John Harris,
M. T. Thomas,
Victor Snieckus,
Noga Friedman,
Kjeld Schaumburg,
Kenneth B. Tomer,
Ole Buchardt,
期刊:
Canadian Journal of Chemistry
(NRC Available online 1977)
卷期:
Volume 55,
issue 1
页码: 56-64
ISSN:0008-4042
年代: 1977
DOI:10.1139/v77-010
出版商: NRC Research Press
数据来源: NRC
摘要:
Thermolysis of 3,5,7-triphenyl-1,2(4H)-diazepine (1) gives, besides the known 2,4,6-triphenyl-pyridine (2), 3,5,6-triphenyl-1,2(4H)-diazepine (3) and 3,5,6-triphenyl-1,2(1H)-diazepine (4) whose structures are deduced on the basis of spectroscopic and chemical evidence. Neat thermolysis of1and the related 5-(p-methoxyphenyl)-3,7-diphenyl-1,2(4H)-diazepine (24a) and 5-(p-chlorophenyl)-3,7-diphenyl-1,2(4H)-diazepine (24c) gives only the corresponding pyridine derivatives2,26a, and26cin low yields. Photolysis of1in ethanol affords the somewhat unstable 3,5,7-triphenyl-1,2-diazabicyclo[3.2.0]hepta-2,6-diene (21) which upon thermolysis undergoes cycloreversion to1and upon hydrolysis provides 3,5-diphenylpyrazole (23) and aceto-phenone. In contrast, photolysis of1as well as of24aand24c in acetone results in the formation of the pyridine (26a,26c) and pyrazole (25a,25c) derivatives respectively in low yields. Irradiation of 5-(P-dimethylaminophenyl)-3,7-diphenyl-1,2(4H)-diazepine (24d) under these conditions gives the photo-oxygenation product24e. The observed thermolysis and photolysis results of1are compared and contrasted with those reported for the closely related 4,4-dimethyl-3,7-diphenyl-1,2(4H)-diazepine (16).
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