Competitive Reactions of Diene Cation Radicals Formed on Irradiated Metal Oxide Surfaces
作者:Marye Anne Fox、Debra D. Sackett、Janet N. Younathan
DOI:10.1016/s0040-4020(01)90277-7
日期:1987.1
which involves the intermediacy of a diene cationradical generated by transfer of an electron from the adsorbed diene to a photogenerated hole localized at the surface of the excited TiO2 particle. Non-oxidative cleavage products are also observed, and the effect of the semiconductor surface in controlling reactivity of the photogenerated cationradical is discussed. The first examples of aromatization
Butenolide Synthesis from Functionalized Cyclopropenones
作者:Sean S. Nguyen、Andrew J. Ferreira、Zane G. Long、Tyler K. Heiss、Robert S. Dorn、R. David Row、Jennifer A. Prescher
DOI:10.1021/acs.orglett.9b03298
日期:2019.11.1
A general method to synthesize substituted butenolides from hydroxymethylcyclopropenones is reported. Functionalized cyclopropenones undergo ring-opening reactions with catalytic amounts of phosphine, forming reactive ketene ylides. These intermediates can be trapped by pendant hydroxy groups to afford target butenolide scaffolds. The reaction proceeds efficiently in diverse solvents and with low catalyst
A Diels-Alder/Retro-Diels-Alder Approach for the Enantioselective Synthesis of Microbial Butenolides
作者:Christian A. Citron、Susanne M. Wickel、Barbara Schulz、Siegfried Draeger、Jeroen S. Dickschat
DOI:10.1002/ejoc.201200991
日期:2012.10.9
structures were verified by synthesis of reference compounds through a Diels–Alder/retro-Diels–Alder approach. This synthetic method was also successfully applied in the synthesis of butenolides that are signalling molecules from streptomycetes. For the enantioselective synthesis of these butenolides a modified route including an enantioselective Diels–Alder reaction was used.
Synthesis of α,β-unsaturated butenolides from allenic acids
作者:G.Bryon Gill、Muhammad Sum Hj. Idris
DOI:10.1016/s0040-4039(00)94958-x
日期:1985.1
The electrophile-initiated cyclisation of allenic acids and esters provides a general route for the synthesis of β-substituted α,β-unsaturated butenolides.
烯丙酸和酯的亲电引发的环化为合成β-取代的α,β-不饱和丁烯内酯提供了一条通用途径。
Flavorant and Fragrance Furan-2(5H)-One Compounds
申请人:Furrer Stefan Michael
公开号:US20100291275A1
公开(公告)日:2010-11-18
A method of providing a flavour or a fragrance to a composition, which includes adding to the composition a compound of the formula I
in which R
1
and R
3
are independently selected from at least one of H, C
1
-C
10
straight chain alkyl or branched chain alkyl, and R
2
and R
4
are independently selected from at least one of C
1
-C
10
straight chain alkyl or branched chain alkyl. Flavored and fragranced products including a compound of the Formula I are also provided.