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oxide with the peak due to the E isomer. The results (Table I)represent mean values of at least two experimental runs and atleast two GC determinations with standard deviation: 2-3. Theremainder of the solution was concentrated and subjected tocolumn chromatography4 using benzene or chloroform to elutethe column. The major fraction containing both isomers wasconcentrated and the (E)-stilbene was isolated by fractionalcry~tallization.T~h e 2 isomer was subsequently isolated from the mother liquor by preparative GC. In the majority of cases separation by fractional crystallization failed; thus the two isomers were separated by preparative GC as white solids or viscous colorless liquids. Reagents and quantities used are listed in Table I1 (see paragraph at !he end of the paper about supplementary material). All the E isomers thus isolated were cleaved to the corresponding stilbenols, which had similar melting points and IR characteristics w
J. Org. Chem 。1988,53 。3841-3843 3841 氧化物以峰顶由于E 异构体。结果(表I)represent 平均值至少二实验性奔跑和atleast 二GC 决心以标准偏差: 2-3 。解答的Theremainder 被集中了和服从了tocolumn chromatography4 使用苯或三氯甲烷对elutethe 专栏。主要分数包含两个异构体wasconcentrated 和(E) 芪由fractionalcry~tallization.T~h e 2 异构体隔绝了与母液随后被隔绝了由预备GC 。多数案件分离由分数结晶无法; 因而二个异构体由预备GC 分离了作为白色固体或黏无色的液体。试剂和数量被使用被列出在表I1 里(参见段在本文的!he 末端关于补充材料) 。所有E 异构体因而被隔绝被劈开了对对应的stilbenols, 有相似的熔点并且IR 特征与那些~btained.E~x ceptions 对在上面早先是着名。 鸣谢。我们是感激对G. Barbaratsas (Thessaloniki 化学系, 大学) 为执行自然力微量分析。 登记第1, 115032-58-1; 2, 110983-36-3; 3.a, 100-52-7; 3b....p-carbomethoxybenzyl 溴化物, 2417-72-3; p(dimethylamin0) - 苯基酒精1703-46-4; p-(methoxymethoxy)benzyl 溴化物115032-64-9; p-iodobenzyl 溴化物, 16004-15-2 。 补充材料可利用: 一般实验性熔点, IR, 核磁共振, 和microanalytical 数据为phosphoniumsalts 5f, g, j, o; 试剂和条件桌为Wittig 反应(表11); 紫外(表111), 熔点, IR, 核磁共振, 和microanalytical 数据为stilbenes 7a-0,8.a-o, 9, 和10 (10 pages).Ordering 信息提供在任一当前的masthead 页。
有太多专业名词了，真的是心有余而力不足。
j.org. chem. 1988,53. 3841-38433841氧化物与山顶由于电子异构体. 其结果(表I)所