简介：Manynaturalproductscontainγ-lactonemoieties.Forexample,β-methyl-γ-butyl-γ-lactones(quercuslactones)aregradientsofagedwhiskey,andβ-methyl-γ-(3-methyl-2-butenyl)-γ-lactone(eldanolide)isapheromoneoftheAfricansugarcaneborer.Wesynthesizedsuchγ-lactonesbyhydrolysesofthehomoallylicalcoholsobtainedbyadditionofaldehydestotheallylicanionsgeneratedfromketenedithioacetalsor2-propenyl-1,3-dithiane.

简介：Newmethodsfordehydrogenationofsteroidal2,5（10）-dieneswith2,3-dichloro-5,6-dicyano-1,4-benzoquinone（DDQ）orpyridiniumhydrobromideperbromide（PHP,Py·HBr·Br2）toaromaticAringsteroidinquantitativeyieldinshorttimearedescribed.

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简介：一系列(p-phenylenevinylene)poly，有好溶解度的s(PPV)poly从先锋的热消除被综合(2,5-didodecyloxy-p-phenylenevinylene)在经由Wessling的不同温度方法。聚合物光物理学被热消除条件影响，它与NMR和红外描述一致。为在高消除温度获得的PPV，在在解决方案并且在电影的更长的波长和转移红的排放最大值的另外的吸收山峰在这些系统显示了更长结合的块的存在。为为PPV的落下演员组电影(436nm)的排放最大值下面获得了200