查询词典 bromization

From the optically active 2, 2'-dihydroxy-1,1 '-binaphthyl, through esterification, Kumada coupling, bromization, hydrolization and Wittig elimination reaction, 2,2'-diethynyl-1,1'-binaphthyl was obtained.

从光学活性的2，2'-二羟基-1，1'-联萘出发，经过酯化，Kumada偶联，溴化，水解和Wittig消除反应五个步骤，成功地获得了具有单一手性的的2，2'-二乙炔基-1，1'-联萘。

In the bromization reaction of LA,the reaction conditions such as reaction temperature,drop time of Br_2 and reaction medium were optimized.

以来源于生物质资源的乙酰丙酸为原料，通过改进的溴化和水解反应合成了5-HLA。

When bromine was used to bromization reaction with 4-acetyl-guaiacol,the product bromide incompletely or super bromide partial,and the selectivity was poor.

使用单质溴与4-乙酰基愈创木酚进行溴化反应时，产物溴化不完全，或者局部过量的溴化，且选择性较差。

The invention comprises the steps of dehydration reaction, purification treatment, bromization ring contraction integral reaction, separation, refining and by-product processing.

本发明包括脱水反应步骤、纯化处理步骤、溴代缩环一体化反应步骤、分离步骤、精制步骤和副产物加工步骤。

The effects of solvent on the bromization reaction and oxidant on the formolation reaction of the target product were studied. The results show that the optimum solvent for the bromization reaction and the optimum oxidant for the formolation reaction of the target product were carbon tetrachloride and ceric ammonium nitrate, and their yields were 86.7% and 89.3% respectively.

同时就溴化反应中的溶剂以及甲酰化反应中的氧化剂对两类反应的影响分别进行了研究，结果表明溴化反应的最佳溶剂为四氯化碳，反应产率达到86.7%，甲酰化反应的最佳氧化剂为硝酸铈铵，产率达到89.3%。

The target compound 1 was successfully prepared via esterification, reduction, bromization and cyanation processes by using L--malic acid (2), which is an inexpensive and easily available starting material. The overall yield was 56.7%.

以廉价、易得的L--苹果酸为起始原料，经酯化、还原、溴代和氰化四步反应得到目标化合物-4-氰基-3-羟基丁酸乙酯，合成总收率为56.7%。

Preparation of p \|cyanobenzylbromides by the bromization of p\|methylbenzenenitrile with H 2O 2\|Br 2 was studied under irradn in the cyclohexane solvents.

研究了在过氧化氢的存在下，用液溴和过氧化氢溴化对甲苯腈制备对腈基苄溴的方法。

The overall yield was 43.6%.The yield of reduce of ester was increased nearly one times than the past method because of KBH4-LiCl as the reducing agent instead of NaBH4. Changing the reaction conditions of bromization, the one-way yield enhanced 30%. The yield of reduce of the bromide was added by one times by improving the process. Tefluthrin was achieved by the catalytic esterification of DCC and DMAP.

优化后工艺对四氟对苯二甲酯的还原采用了廉价高效的还原试剂KBH4-LiCl，使收率比NaBH4法提高了近一倍；对溴化反应条件进行了优化，单程收率提高了30%；对溴化物还原条件的优化，使其收率提高了近一倍；采用了催化剂DCC和DMAP合成了最终产品七氟菊酯。

Study on an efficient process for the preparation of trifloxystrobin starting from 2-methylacetophenone bypartial oxidation,esterification,reaction with methoxyamine,bromization and condensation with 3'- acetophenone oxime.

以邻甲基苯乙酮为原料，经过高锰酸钾的碱性氧化，甲醇酯化，再与甲氧基胺盐酸盐肟化后，用N-溴丁二酰亚胺溴化，最后和间三氟甲基苯乙酮肟缩合得到目标产物肟菌酯。

The synthesis of poly{2-4-[bi(4-tetrabutylphenylamino]phenylphenylenenvinylene} was beginwith 4-tetrabutylbenzoic,through acylation、Hoffmann rearrangement、bromization、idionization、Ullmann reaction、bromization、condensepolymerization.

聚{2-[4-二(4-叔丁基苯胺基苯基]苯撑乙烯}是以对叔丁基苯甲酸为原料，经酰氯化、酰胺化、Hoffmann降解、碘化、Ullmann反应、溴化、缩聚反应得到。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。