Etude de la photooxygenation par l'oxygene singulet, de la photooxygenation par l'anthracenedicarbonitrile-9,10 et de l'electrooxygenation de bicyclanylidenes en dioxetanes-1,2 dispiranniques
Etude de la photooxygenation par l'oxygene singulet, de la photooxygenation par l'anthracenedicarbonitrile-9,10 et de l'electrooxygenation de bicyclanylidenes en dioxetanes-1,2 dispiranniques
by one-pot reactions of ketone hydrazones with diselenium dibromide, which suggested the in situ formation of selone and diazoalkane intermediates. The thermolysis of these compounds gave symmetrical olefins, whereas oxidation afforded the corresponding azines. The reaction of acetophenone hydrazones with diselenium dibromide afforded 2,5-diarylselenophenes in moderate yields. The reaction proceeded
Reactions of Ketone Hydrazones and β-Keto Enamines with Disulfur Dichloride. New Synthesis of Thioketones and 5<i>H</i>-1,2,3-Dithiazoles
作者:Renji Okazaki、Kaoru Inoue、Naoki Inamoto
DOI:10.1246/bcsj.54.3541
日期:1981.11
to afford thioketones in good yields. The reaction mechanism involving N-thiosulfinylamine (R2C=N–N=S=S) and S-thioxothioketone (R2C=S=S) is proposed. The formation of t-butyl and di-1-adamantyl thioketones even at low temperatures has been interpreted as steric congestion alone being not enough to stabilize the corresponding S-thioxothioketones. The reaction of β-ketoenamines with disulfur dichloride
reported. The reaction of dimagnesium salts of ketone hydrazones with diselenium dichloride affords an intermediate tentatively assigned as tetraselenides, which are converted into selenoketones by heating in the presence of tributylamine. A comparative study on the reactions of 1,1,3,3-tetramethyl-2-indanselone and the corresponding thioketone with Grignard and organolithium reagents have been carried
The one-pot reaction of sterically hindered hydrazones with tellurium dichloride or tellurium tetrahalide in the presence of triethylamine in benzene afforded Δ3-1,3,4-telluradiazolines 1, a novel heterocycle, via 1,3-dipolar cycloaddition of telluroketones and diazo compounds, both generated in situ. The molecular structure of 1a was established by X-ray crystallographic analysis. The photolysis of
Selones as intermediates in the preparation of extremely sterically hindered molecules
作者:Frank S. Guziec、Lynn James SanFilippo、Christopher J. Murphy、Christine A. Moustakis、Edward R. Cullen
DOI:10.1016/s0040-4020(01)96723-7
日期:1985.1
The preparation and reactions of selones, selenium analogues of ketones, are described with particular emphasis on their utility in the preparation of extremely stericallyhindered molecules. Mechanistic questions related to these reactions are discussed and evidence for “active selenium” is presented. Selenophilic additions of organometallic compounds to selones are also reported.