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- hydroxyallysine aldol 羟赖氨醇
- The prospect of the catalysts for aldol condensation is also been put forward. 羟醛缩合可以形成新的碳-碳键,增长碳链,是一类重要的有机反应。
- They were principally used to catalyze aldol, allylation, Diels-Alder, ene and Friedel-Crafts reactions. 它们主要被用来催化Aldol;烯丙基化;Diels-Alder;Ene和Friedel-Crafts等反应.
- The key step of this protocol again involves an asymmetric acetate aldol addition (dr 87:13). 本议定书的关键一步又牵涉到另外一个不对称醛酯(何87:13).
- Abstract : An environment-friendly L-prolinamide catalyzed aldol reaction has been developed. 摘要 : 本文报道了一种环境友好的脯氨酰胺催化水相直接羟醛缩合反应。
- Aldol condensation is an important organic reaction which leads to the formation of new C-C bond. 摘要羟醛缩合可以形成新的碳-碳键,增长碳链,是一类重要的有机反应。
- Proline is believed to catalyse the aldol reaction through a hydrogen-bonded intermediate. 人们普遍认为,脯氨酸通过形成单氢键相连接的中介物来催化醛醇缩合反应。
- To be successful, a crucial selectivity problem in the conversion of aldehyde 4 to aldol 3 had to be understood and solved. 要取得成功;关键选择性问题转化为乙醛醛34已被理解和解决.
- Using inorganic base as a catalyst, 2,2-dimethylolbutyraldehyde was prepared by the aldol condensation from formaldehyde and butyraldehyde. 甲醛和丁醛在碱性催化剂的存在下,进行羟醛缩合反应,制备2,2二羟甲基丁醛。
- Conclusion:Piperidine shows satisfying effects and deserves further research as a promising catalyst in aldol condensation... 结论:以哌啶为催化剂,经羟醛缩合制备查尔酮类化合物具有一定的优越性,值得进一步深入研究。
- Trimethylolheptane (TMH) was synthesized through consecutive aldol condensation and Cannizzaro reaction of octylaldehyde and formaldehyde, using sodium hydroxide as catalyst. 以氢氧化钠为催化剂,辛醛和甲醛在较低温度下发生羟醛缩合反应生成2,2-二羟甲基辛醛。
- Butyrolactone series products are synthesized via aldol condensation, catalytic hydrogenation and oxidation reaction based on cyclopentanone and aliphatic aldehyde. 以环戊酮和脂肪醛系列为原料,经过羟醛缩合、催化加氢、氧化反应,三步制得丁位内酯系列产品。
- Indeed, compound 9 could be isolated from these reaction mixtures, and it was also prepared via oxidation 14 of aldol 3 with Dess-Martin 15 reagent 13 . 的确;这些化合物9反应混合物可以隔绝;也准备经醛氧化14获准延长3-马丁15试剂13.
- Using solid acid as the catalyst, DMDBS ?? the nucleation agent for polypropylene synthesis was prepared by the aldol reaction of D-sorbitol with 3,4-Dimethyl benzaldehyde. 以D-山梨糖醇和3,4-二甲基苯甲醛为原料,在固体酸催化剂下进行醇醛缩合反应,合成了二(3,4-二甲基二苄叉)山梨糖醇(DMDBS),并对影响产品熔点和收率的因素进行了考察。
- When adding dianion 5 to aldehyde 4 and using the molar ratios of entry 1, the yield of aldol 3 dropped from 98% to 86%, and 7% of alcohol 7 was formed. 当加入醛酸根5比4;用摩尔进入一日产量3醛从98%25下降到86%25;而77%25的酒精组成.
- Eight flavones were synthesized through acetylation、methoxyl protection、aldol condensation and closing ring used 1,3,5-trihydroxylbenzene and resorcin as the initial materials. 以间苯二酚和间苯三酚为原料,经乙酰化、甲氧基保护、羟醛缩合、关环4步反应合成了8种黄酮。
- Some problems about the intersection condensation of aldol in the present textbook of organic Chemical Experiment are pointed out. Mean while some improved are presented. 本文指出了现行有机化学实验教材中的交叉羟醛缩合反应存在的不足,并提出改进措施。
- Abstract : The first histidine catalyzed direct aldol reactions of ketones with nitrobenzaldehydes in water and in poly(ethylene glycol) (PEG) were reported. 摘要 : 本文首次报道了组氨酸在水中和聚乙二醇中催化酮和对硝基苯甲醛间的直接羟醛缩合反应。
- When analyzing the process for potential improvements, we came to the conclusion that omission of crystallization and drying of aldol 3 would offer the largest saving potential. 在分析过程中潜在的改善;我们得出了结论遗漏醛结晶、干燥3将提供最大的节水潜力.
- Temperature rise could increase molecular average kinetic energy and quicken alcohol acid esterification, aldol reaction and aldehyde-aldehyde condensation. 实践表明,以适当的高温,利用陶坛贮酒可加快白酒老熟,缩短生产时间,提高设备利用率,增加经济效益。