简介：降低polyketone合成的费用，稀土元素坐标催化剂被介绍给一氧化碳(公司)和苯乙烯(圣)的共聚化合物综合aliphaticpolyketoneSTCO。催化系统由稀土元素钕醋酸盐，乙酸钇，2,2''-bipyridine，p-toluensulfonic酸，含铜的p-toluensulfonate，和1,4-benzoquinone组成。Thecatalyst和共聚物被红外线的光谱和X光检查photoelectronspectrosco-py分别地描绘。催化系统的每个部件和共聚化合物的催化活性上的稀土元素醋酸盐的类型的效果被调查。结果证明建议稀土元素在公司和圣的copoiymerization有不同催化活性，最大的活动能到达303.3gSTCO/(摩尔中心点h)。

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简介：PromotedbySmI3,acetophenonesandbenzaldehydescanundergotheMukaiyamatypealdolcondensationinthepresenceofTMSCltoformchalconesingoodyields.

简介：IntroductionInthepastseveralyears,muchresearchworkhasbeendoneforthesynthesisofC-fusedbicyclo-β-lactamcompoundsandaconcise“DoubleAnnulation”procedurehasbeendeveloped.Theβ-lactamringisformedbytheclassicalStaudingerreaction［1—3］betweenα-(alkylthio)acylchlorideandanequivalentα,β-unsaturatedimine.Thesulfurringissubsequentlyfusedontotheβ-lactamunitbymeansofahalogen-promotedheterocyclizationprocess［4—6］.ThisprocedurewasappliedtothesynthesisofpenemasillustratedinFig.1.TheobtainedX-penemsareakindofimportantintermediatesforsynthesizingaseriesofβ-lactamcompounds,forexample,theyarecarboxylatedbycouplingreactionsontheCatomwhichislinkedtohalagen,formingpenem［7］.Animportantpurposeintheresearchfieldistoprobeintonewβ-lactammedicines.

简介：Ashortandfacilesynthesisofaseriesof1,2-dihydroquiazolin-4(3H)-oneswasaccomplishedingoodyieldsvianovelreductivecyclizationofo-nitrobenzamideswithketonespromotedbyTiCI4/Znsystem.Thestructurewasestablishedonthebasisofelementalanalysis,IR,^1HNMRandconfirmedbyasingle-crystalX-raydiffractionanalysis.Thismethodhastheadvantagesofeasilyaccessiblestartingmaterials,convenientmanipulationandmoderatetohighyields.

简介：Promotedbystannoussalts,1,1,1-trichloro-2,2,2-trifluoroethanereactsreadilywithaliphatic,aromatic,andα,β-unsaturatedaldehydesgivingthecorrespondingalcoholsbearingaCF3CCl2-moietyingoodtoexcellentyields.ThesealcoholsarefartheroxidizedbyJonesreagentgivingthecorrespondingketonesinhighyields.

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