第三章C-C双键的形成
摘要:Chapter3FormationofCarbonCarbonDouleBondsI.TheSyntheticMethodsofAlklenes1.-Eleminationreactions(-消去反应)CCHXCC+HXX=-OH,-OCOR,±ËØ,-OSO2Ar,-N+R3,-S+R2etal.SaytzeffruleX=-OH,-OCOR,±ËØ,-OSO2Ar,HofmannruleX=-N+R3,-S+R2RegioselectivitySyneliminationSaytzeffeliminationsAntieliminationStereoselectivityHofmanneliminationsAntielimination2.Pyrolyticsyneliminations(顺式热消去反应)CCHOCo300~500CC+RCO2HORApplications:SynthesisofterminalalkenesfromprimaryacetatesCH3CH2CH2CH2OCOCH3500oCN2CH3CH2CH=CH2Disadvantages:Highreactiontemperature100%OCCHOo100~200CC+CHSCSRSChugavereactionSRCCHNR2100~200oCCCO反应条件比对应的酯热消去温和。+R2NOHCopereaction3.Wittigandrelatedreactions(Wittig及有关反应)WittigReactionG.Wittigrecei
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