查询词典 borane

Asymmetric borane reduction of prochiral ketones is a good process to the synthesis of enantiomerically enriched secondary alcohols.

硼烷对前手性酮的不对称还原是合成手性仲醇的重要方法。

Asymmetric hydroboration is a kind of widely applied and valuable reaction, in which borane reduction of prochiral ketones reaction is an important method.

不对称催化硼氢化反应是应用广泛且具有工业价值的反应，其中的硼烷还原前手性酮反应有着举足轻重的作用。

Using 10 as the catalyst, six prochiral ketone s were reduced enantioselectively with borane and the results were compared with those with 1,1- diphenylprolinol as catalys.

用10催化6种前手性酮的不对称硼烷还原反应，其结果与-二苯基脯氨醇催化的同一反应的结果进行了对比。

Heterborane was gained by displacing of other non-metallic atoms to Boron of borane skeleton structure.

凡是硼烷骨架中的硼原子被其它非金属原子取代后均可得到杂硼烷。

Finally, the influence of trialkyl borane BPh〓, B (c-hexyl 〓 and B 〓 on ethylene polymerization by metallocene was studied.

本文还研究了烷基硼化物BPh〓、B(c-hexyl〓和B〓对茂金属催化体系的影响。

The best results 98% ee, 94% ee and 59% ee were obtained in silylcyanation of aldehydes, borane reduction of prochiral ketones and ketimines, respectively.

醛的硅氰化反应ee值最高达到98%，酮的硼烷还原反应ee值达94%，而亚胺的硼烷还原反应ee值只有59%。

Herein we mainly discuss the design of four series of chialβ-amino alcohols and their application to the asymmetric borane reduction ofprochiral ketones.

本论文主要设计合成了四个系列的手性氨基醇类的催化剂，研究了它们在硼烷对前手性酮的不对称还原反应中的应用。

All the prepared compounds were characterized by 〓H NMR、〓P NMR and elemental analysis. The catalytic activity of each prepared chiral phosphorus compound in the borane reduction of prochiral ketones was studied.

对每一种手性磷化合物，考察了其作为配体催化剂在潜手性酮的不对称硼烷还原反应中的催化效果，讨论了影响不对称诱导的各种因素。

Then we applied these chrial ligands to asymmetric borane reduction of w-bromoacetophenone and diketones.

将其应用于前手性单酮及二酮的还原中，其中双方酰化脯氨酸在1，6-二苯基-1，6-己二酮的还原反应中可获得最高为90％的ee值。

Carborane, an important specie of borane derivatives, obtained by replacing BH or BH- group with C or CH, have applied in many fields due to its representative structure and special bond.

碳硼烷是用C原子替代BH单元或用CH单元替代BH-单元形成的一类重要的硼烷衍生物，其构型的典型性以及化学键的特殊性，在很多方面都有所应用。

There had been a moment during the breakfast meeting, though, after the backslapping and the small talk and when all of us were seated, with Vice President Cheney eating his eggs Benedict impassively and Karl Rove at the far end of the table discreetly checking his BlackBerry, that I witnessed a different side of the man.

那次早餐会期间，在表示过关心和寒暄以后，我们所有人坐了下来，我注意观察了一下，副总统切尼面无表情地吃着班尼迪克蛋（Eggs benedict，源自美国，以英式松饼、火腿、水煮蛋以及荷兰酱组合而成），卡尔。罗夫在餐桌的远端谨慎地经常查看他的黑莓手机，我目睹了他所不为人知的一面。

Talk Undelete failed; someone else may have undeleted the page first.

Talk 无法删除选定的页面或图像（它可能已经被其他人删除了）。