Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Staudinger-Pfenninger

STAUDINGER PFENNINGER ThHranedioxidesynthesis ThSrane dioxide episuRone synthesis by reaction of diazomethane with suRenes or S02... [Pg.184]

D. Diazoalkanes and Sulfur Dioxide the Staudinger-Pfenninger Reaction. 715... [Pg.697]

Sym. ethylene derivatives from hydrazones Staudinger-Pfenninger synthesis... [Pg.209]

The chemistry of three-membered rings containing oxidized sulfur starts with the work of Staudinger and Pfenninger (equation 1). [Pg.384]

Diphenyldiazomethane has been prepared only by oxidation of benzophenone hydrazone.3 The procedure given above is that of Staudinger, Anthes, and Pfenninger, with minor changes. The method of preparation of benzophenone hydrazone given above is a modification of the procedure of Curtius and Rauter-berg.4... [Pg.90]

Staudinger and Pfenninger long ago suggested that addition of sulfur dioxide to diphenylketene gives an intermediate, 3,3-diphenyl-l,2-oxathietane-4-one 2-oxide, that decomposes to diphenylsulfene and carbon dioxide, the former yielding tetra-phenylethylene. Similar intermediates were proposed for the addition of sulfur dioxide to pentamethyleneketene, ketenimines, " ethylene, 1,1-difluoro-ethylenes, and an aluminum trichloride derivative of the 1,2,3,4-tetramethyl-cyclobutene cation. An intermediate adduct 494 actually has been isolated at... [Pg.612]

The first addition of a sulfene to a carbon-nitrogen double bond was reported by Staudinger and Pfenninger (1916), who demonstrated that diphenylsulfene (119) generated from diphenyldiazomethane (120) and sulfur dioxide, reacts with benzylideneaniline (121) to give the four-membered [2+2] cycloadduct (122) (Scheme 75). [Pg.121]

Pfenninger s. Staudinger Pfitzner-Moffati reagent 21, 284 pH s. Buffer solns.. Regulators 2-Phase medium, reactions in -0-debenzylation, preferential 22,11 oxidation 21, 730 Phenacetyl chloride as reagent 22, 535... [Pg.279]

See other pages where Staudinger-Pfenninger is mentioned: [Pg.577]    [Pg.352]    [Pg.184]    [Pg.729]    [Pg.352]    [Pg.577]    [Pg.352]    [Pg.184]    [Pg.729]    [Pg.352]    [Pg.473]    [Pg.473]    [Pg.90]    [Pg.363]    [Pg.623]    [Pg.638]    [Pg.142]    [Pg.730]    [Pg.416]    [Pg.1062]    [Pg.363]    [Pg.352]    [Pg.134]    [Pg.55]    [Pg.655]    [Pg.734]    [Pg.759]    [Pg.762]    [Pg.763]    [Pg.501]    [Pg.412]    [Pg.762]    [Pg.352]    [Pg.515]   


SEARCH



Staudinger

© 2024 chempedia.info