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。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。