合成

N,N′-Disubstituted ureas,used as intermediates for synthesis of pesticides,resin precursors and carbamates,were synthesized from carbon dioxide and primary amines(namely n-propylamine,n-butylamine,n-amylamine,n-hexylamine,benzylamine and aniline) over organic base catalysts.

以有机碱为催化剂，CO2与伯胺反应合成了N，N′-二取代脲；考察了有机碱种类、伯胺碳链长度、反应温度、CO2压力、反应时间、催化剂用量对合成反应的影响。

N,N′-Disubstituted ureas,used as intermediates for synthesis of pesticides,resin precursors and carbamates,were synthesized from carbon dioxide and primary amines(namely n-propylamine, n-butylamine ,n-amylamine,n-hexylamine,benzylamine and aniline) over organic base catalysts.

以正丁胺为反应基质、TBD为催化剂，合成N，N′-二丁脲的最佳反应条件为：反应温度180℃，CO2压力10.0M Pa，反应时间10h，TBD摩尔分数5.0%；在此条件下，N，N′-二丁脲的收率为81.8%；红外光谱表征结果表明，合成的产物为N，N′-二丁脲。

This paper studies that TLC technology is applied to synthesis of benzylidene acetone .

将薄层色谱技术应用于苄叉丙酮的合成实验，通过薄层色谱对合成反应过程的监控，增加了实验的探究性，提高了学生分析问题、解决问题的能力

Inaddition, an unexpected synthesis of an α,β,γ,δ-unsaturated ketone due to an abnormalopening of benzylidene acetal by bromide anion was achieved.

另外，在合成BC环的过程中，由于一步反常的溴负离子开苄叉反应，我们还意外地合成了一个α，β，γ，δ-不饱和酮化合物。

TPP gene plays an important role in synthesis of trehalose. The cloning of TPP gene lays a solid basis for investigating the biosynthesis of trehalose in L. bicolor.

海藻糖－6-磷酸磷酸酯酶在海藻糖合成过程中起关键作用，该基因的克隆为研究海藻糖在二色补血草中的合成奠定了基础。

This thesis aims at the studies on the total synthesis of bicyclic sesquiterpenes and the novel and efficient synthetic strategy of Valsartan, a kind of medicine for hypertension.

本论文以双环倍半萜类天然产物的全合成研究及抗高血压药物——缬沙坦的新合成路线为研究对象，分为以下四部分内容。

As a continuation of our previous research on syntheses of tetrahydrofuro[3,2-b]furan-1(5H)-one, Dr. Zhang Yi-Jun started the total synthesis of pallavicinin B in 2002, and made strategic achievement in building the bicyclo[3.2.1]octane skeleton.

基于我们小组多年来对具有四氢呋喃并γ-丁内酯子结构的天然产物全合成研究的兴趣，从我们小组张怡隽博士就已经开始了pallavicinin B的全合成研究，并取得了阶段性的进展：成功构建了骨架中下半部的二环[3.2.1]辛酮。

III. Studies on the total synthesis of macrophllin type of bicyclo[3, 2, 1] octanoid neolignans ( C-4': endo ) The first total synthetic route of macrophllin type of bicyclo[3, 2, 1]octanoidneolignans ( C-4': endo ) was established based on the rearrangement ofbenzofuranoid and bicyclo[3, 2, 1]octanoid neolignans.

三、Macrophllin型双环[3，2，1]辛烷类新木脂素(C-4'桥环为endo)的全合成研究利用氢化苯骈呋喃类新木脂素和双环[3，2，1]辛烷类新木脂素的重排关系，首次建立了macrophllin型双环[3，2，1]辛烷类新木脂素(C-4'桥环为endo)的全合成路线。

In our study, polyimide hybrid films containing bimetalic compounds were prepared by codoping poly with a bariumand titanium precursor prepared from Ba(CH_3COO)_2, Ti_4, and acetic acid followed by casting and thermal curing.

陶瓷粉BTL是由Ba(CH_3COO)_2，Ti_4和乙酸制成的钡钛前驱物，采用溶胶凝胶法合成，并由红外光谱和X-射线衍射图证明，在650℃BTL完全转化为BaTiO_3晶体。 3。通过两步法合成含陶瓷粉的聚酰亚胺复合材料。

Starting from 3, 5-dihydroxybenzoic acid, a total of 16 kinds of salicylicaldehyde derivatives have been synthesized by the esterification, substitution, reduction, formylation, condensation, brominate, functional group protection and deprotection reactions, of which 11 have not been reported yet. Enatiomerically pure 2-amino-2'-hydroxy-1, 1'-binaphthyl has been easily obtained from its racemic mixture by the eantioselective formation of inclusion crystals with N-benzylcinchoninium chloride.

树枝状大分子希夫碱三齿手性配体的设计与合成从3，5-二羟基苯甲酸出发，通过酯化、取代、还原、甲酰化、缩合、官能团的保护与去保护等反应合成了四个系列16种水杨醛衍生物，其中11中是未见文献报道的新化合物。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！