Rhodium-Catalyzed Synthesis of Eight-Membered Rings
作者:Brenton DeBoef、W. Richard Counts、Scott R. Gilbertson
DOI:10.1021/jo0620462
日期:2007.2.1
Experiments to develop a rhodiumcatalyst for the [4 + 2 + 2] cycloisomerization of dienynes with a second alkyne are described. The generality of the reaction is probed in terms of dienyne structure and alkyne structure. A catalystsystem that provides cyclooctatrienes in greater than 70% yield is reported. Several experiments to determine the nature of the catalyst are described.
Reduction of alkyl 2,4-alkadienoates with sodium dithionite under phase transfer conditions
作者:Francisco Camps、Josep Coll、Josefina Guitart
DOI:10.1016/s0040-4020(01)86818-6
日期:——
The reduction of alkyl 2,4-alkadienoates, bearing alkyl substituents on the diene system, with sodiumdithionite, underphasetransferconditions, gives satisfactory yields of E:Z isomeric mixtures of the corresponding 3-alkenoates, except in the case of the C-2 substituted substrate which afforded the E-3-alkenoate as the only reduction product.
Palladium-catalyzed synthesis of 2,4-dienoic acid derivatives from vinylic halides
作者:Jin-Il I. Kim、Babu A. Patel、Richard F. Heck
DOI:10.1021/jo00319a005
日期:1981.3
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作者:Donald W. Cameron、Ross M. Heisey
DOI:10.1071/ch00027
日期:——
Reaction of certain geometrically defined 1,1-dioxy-4-alkyl- and -4,4-dialkyl-substituted buta-1,3-dienes with halogenated quinones does not involve Diels-Alder or Michael addition chemistry. Instead, rapid competitive oxidation of the dienes to give 2,4-dienoate esters was observed. This new reaction involves strong spatial association between diene and quinone, hydrogen being transferred specifically from the (4E)-alkyl group. Its scope is compared with addition of the same terminally substituted dienes towards the reactive non-quinonoid dienophile tetracyanoethylene.
Besida, John; Brown, Roger F. C.; Colmanet, Silvano, Australian Journal of Chemistry, 1982, vol. 35, # 7, p. 1373 - 1383
作者:Besida, John、Brown, Roger F. C.、Colmanet, Silvano、Leach, David N.