扁桃酸

1 At a reaction temperature of 100 ℃ and a reaction time of 30 min to give 2,which was then subjected to condensation reaction with p-propoxy mandelic acid in the presence of phosphoric acid at a molar ratio of m(2)∶m( p-propoxy mandelic acid )∶m=1∶1∶1 at a reaction temperature of 60 ℃ for 3 h to yield 3,which was further oxidized by chloranil to give t.

对现有分散红356合成工艺进行了优化，以n∶n=1.2∶1投料，100℃反应30 min得缩合物2，再在等质量磷酸催化下与分批加入的等质量对丙氧基扁桃酸60℃缩合3 h得缩合物3，经温和氧化剂四氯苯醌氧化得标题化合物，总收率55%。

The effects of aromatic solvents, catalyst amount used and reaction conditions on the enantiomer excess e.

本文还探讨了手性相转移催化条件下扁桃酸异构体的不对称合成。

Mandelic acid may be used in lieu of hydroquinone or in conjunction with it for optimal benefit in individuals who are able to tolerate the combination.

扁桃酸，可用於代替对苯二酚，或在与它为最优，在个人的利益谁能够容忍的组合。

Mandelic acid is well tolerated and ideal for darker skin types where the risk of hyperpigmentation is very low.

扁桃酸是很好的耐受性和理想的肤色较深的类型如色素沉着的风险是很低的。

On the optimum condition ,the maximum yield of 84.45% was obtained.

对3-乙氧基-4-羟基扁桃酸在铂电极上的电氧化进行了研究。

The minimum spermicidal concentration being(0.05 mg/ml) in(3 min) of the sasanqua saponin sterilant was corresponded with nonoxynol spermicide and was lower than mandelic acid(0.1 mg/ml and citric acid(0.25 mg/ml.

结果 油茶皂素不育剂对雄性小鼠呈现出较优的剂量依赖性体外杀精活性，3 min时的最低杀精浓度为0.05 mg/ml，与人用杀精剂壬苯醇醚相当，比扁桃酸(0.1 mg/ml)和柠檬酸(0.25 mg/ml)低。

Results The spermicidal effect in vitro on male mice of the sasanqua saponin sterilant was provided with excellent positive relation in dosage-effect. The minimum spermicidal concentration being 0.05mg/ml in 3min of the sasanqua saponin sterilant was corresponded with nonoxynol spermicide and was lower than mandelic acid(0.1mg/ml) and citric acid(0.25mg/ml).

结果 油茶皂素不育剂对雄性小鼠呈现出较优的剂量依赖性体外杀精活性，3min时的最低杀精浓度为0.05mg/ml，与人用杀精剂壬苯醇醚相当，比扁桃酸(0.1mg/ml)和柠檬酸(0.25mg/ml)低。

The analogs of piracetum with the core of demethylclausenamide(III-4 and III-5) were prepared by condensation of demethylclausenamide with ethyl bromoacetate and hydrolysis or aminolysis there after.

3在兰培工作的基础上，选用O-乙酰-R--扁桃酸为拆分剂，成功的拆分了表黄皮酰胺前体5--4-苯基-1-甲基吡咯烷酮(Ⅱ-1)，和Ⅱ-1分别引入3位羟基得到和表黄皮酰胺。

Under above selected conditions, the yield of methyl mandelate is

在此工艺条件下，扁桃酸甲酯的收率基本稳定在

The HPW/M-SiO2 catalyst in the process of synthesis of methyl mandelate has the good redundant use.

HPW/M-SiO2催化剂在扁桃酸甲酯合成过程中具有较好的重复使用性。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。