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- Three strategies (additive, chiral auxiliary or chiral reagent) were developed to improve the diastereoselectivity or enantioselectivity of the ylide cyclopropanation reactions. 通过添加剂、手性辅基、手性试剂等3种策略,分别控制反应的非对映选择性和对映选择性。
- Rotundine was used as chiral auxiliary for NMR analysis of racemic carboxylic acids and it turned out to be an effective chiral solvating agent(CSA). 以罗通定为手性溶解剂,用核磁共振方法分析了几种外消旋羧酸。
- First, the required chiral auxiliary (+)- 23 was available in only moderate yield, requiring an impractically long period to produce (ca. 4 weeks). 第一;必须辅助手(+)-23只可适度产量;要求不切实际长期制作人(约占4周).
- In the exposition of fearnaught technology, the relaxation of fiber, fiber-mixed and the choice of auxiliary reagent is elaborated. 在和毛工艺的阐述中,对纤维的开松、混合、给助剂及相关助剂的选择做了详细的论述;
- Owing to the special structure and properties, tert-leucine is an important intermediate in pharmaceutical production and a chiral auxiliary for asymmetric synthesis. 由于叔丁基的特殊结构和性质,叔亮氨酸是重要的医药中间体和不对称合成的手性诱导模板。
- The main focuses are the asymmetric allylation reactions of C=N double bonds through using chiral auxiliary groups, chiral allylation reagents, and asymmetric catalysts. 详细地综述了有关C=N双键立体选择性烯丙基化反应的研究进展。
- Carbohydrate, with multi-functional groups and chiral centers in one small molecule, is inexpensive and can be converted into efficient chiral auxiliary for controlling asymmetric synthesis. 摘要糖作为一类具有多官能团、多手性中心、廉价易得的手性小分子可以很方便地作为手性助剂用于不对称合成。
- The paper expounded theory, characteristics, using range and auxiliary reagent of hydrochloric acid, hydrofluoric acid, citric acid, EDTA and made simple introduction to their craft and use instances, when cleaning the boiler can take reference. 摘要对盐酸、氢氟酸、柠檬酸、乙二胺四乙酸四种锅炉常用化学清洗剂的清洗原理、特点、使用范围,以及配套助剂进行详细的阐述,并对四种清洗剂的清洗工艺及应用实例进行了简单介绍,可在锅炉清洗时进行参考。
- auxiliary reagent for negative photoresist 负性胶配套试剂
- auxiliary reagent for positive photoresist 正性胶配套试剂
- A series of optically active sulfenimines carryins new caniphor based mer-capto chiral auxiliaries have been synthesized. 合成了四种含樟脑巯基手性助剂的光学活性的硫亚胺化合物。
- chiral auxiliary (reagent) [化] 手性助剂
- The jute fiber was treated by two different methods: built additive auxiliary reagents pretreatment,alkali treatment,water treatment. 对黄麻纤维进行三种预处理:复配助剂处理、碱处理、水处理。
- Recent developments making use of chiral auxiliaries have put forward the versatility of procedure for the asymmetric synthesis of linear and cyclic 1,4-dicarbonyl compounds. 近期进展是利用手性辅助试剂,不对称合成链状和环状的1,4-二羰基化合物。
- L-Methyl glyoxylate is an important chiral reagent. 二羟乙酸L-薄荷酯是一种重要的手性试剂。
- Keywords D (-)camphor sultam;Chiral auxiliary;Asymmetric synthesis; 樟脑磺内酰胺;手性助剂;不对称合成;
- Oxazo-type compounds mainly include oxazolidinone, oxazoline and oxazaborolidine.Usually they are used as chiral auxiliaries, chiral catalysts and chiral ligands in asymmetric reactions. 摘要聚合物支载恶唑类化合物主要包括聚合物支载恶唑烷酮、恶唑啉和硼杂恶唑啉等,其在不对称反应中主要用作手性助剂、手性催化剂及催化剂配体。
- Keywords optically active biaryl compound;biaryl coupling reaction;chiral auxiliary; 光学活性联芳基化合物;不对称二芳基偶联反应;手性配体;
- Keywords non-cross-polystyrene;supported;oxazolidinone;chiral auxiliary;synthesis; 线型聚苯乙烯;支载;恶唑烷酮;手性助剂;合成;
- mainly produce medical materials such as flumequine,propylthiouracil,carbamazepine,chiral auxiliary and pharmaceuicalintermediates. 主要产品有氟甲喹、丙硫氧嘧啶、卡马西平及手性助剂等原料药和各类医药中间体。