乙酸水解

Cephalotaxine ester of 2-oxo-6-methylheptanoic acid was treated with lithium diisopropylamide and Me O-(1-methoxyisopropyl)glycolate to give a mixture of homoisoharringtonine and its stereoisomers with 56% yield. The four stereoisomers separated by TLC showed identical mass spectra and almost superimposed IR but with different 1H NMR spectra. The configuration of the 2'-C and 3'-C of the four isomers were postulated based upon their 1H NMR spectra as compared with the 1H NMR spectra of isoharringtonine and its stereoisomers.

2-氧代-6-甲基庚酰基三尖杉碱(3)与0-(1-甲氧基异丙基)羟基乙酸甲酯(4)在强碱性试剂二异丙胺锂存在下，起亲核加成反应，反应中间体5在室温用酸性丙酮水解，得到一种新的三尖杉酯类生物碱一一高异三尖杉酯碱(6c)及其立体异构体(6a、6b、6d)的混合物，产率56%、通过制备薄层层析分得这四个立体异构体，它们的1H NMR和异三尖杉酯碱及其立体异构体的1H NMR类似，推定了它们的绝对构型。

Owing to phosphorous acid is produced from phosphorus trichloride in industry by hydrolysts, inspissation and crystallization, if we use phosphorus trichloride directly on synthesize N- iminodiacetic acid, not only can simplify operation, but also can red.

原工艺采用的是在酸性条件下高温时将甲醛滴加到亚磷酸与亚氨基二乙酸一钠盐混合溶液中进行反应，考虑到工业上亚磷酸的合成一般采用三氯化磷水解、提浓、结晶制得，直接将三氯化磷用于双甘膦的合成，不仅可以简化操作过程，而且对于降低生产成本和能耗有明显意义。

Originally techniques dropped formaldehyde into the mixture of phosphorous acid and monosodium of imino diacetic acid in high temperature. Owing to phosphorous acid is produced from phosphorus trichloride in industry by hydrolysis, inspissation and crystallization, if we use phosphoros trichloride directly on synthesize N- iminodiacetic acid, not only can simplify operation, but also can reduce the cost and save energy.

原工艺采用的是在酸性条件下高温时将甲醛滴加到亚磷酸与亚氨基二乙酸一钠盐混合溶液中进行反应，考虑到工业上亚磷酸的合成一般采用三氯化磷水解、提浓、结晶制得，直接将三氯化磷用于双甘膦的合成，不仅可以简化操作过程，而且对于降低生产成本和能耗有明显意义。

Ingredients: Water,Glycerin,Caprylic/Capric Triglyceride,Myristyl Myristate,Butyrospermum Parkii Butter,Glyceryl Stearate,Panthenol,Betaine,Dimethicone,Hydrolyzed Collagen,Allantoin,Polysorbate-60,Carbomer,Xa-nthan Gum,Parfum,Triethanolamine,Tocopheryl Acetate,Hyaluronic Acid,Methyl Paraben,Propyl Paraben,Creatine,Tetrasodium Edta,Phenoxyethanol,Caprylyl Glycol,Sorbic.

成分： 去离子水，甘油，辛酸/葵酸三甘油酯，肉豆蔻酸肉豆蔻酯，乳木果油，硬脂酸甘油酯，泛醇，甜菜碱，聚二甲基硅氧烷，水解胶原蛋白，尿囊素，聚山梨醇酯-60，卡波姆，汉生胶，香精，三乙醇胺，生育酚乙酸酯，透明质酸，对羟基苯甲酸甲酯，对羟基苯甲酸丙酯，肌酸，乙二胺四乙酸四钠，苯氧乙醇，辛二醇，山梨酸。

Hydroxyacetic acid was synthesized by glycolonitrile in the presence of H2SO4 , and it was separated by applying extraction based on chemical complexation and solvent method.

以羟基乙腈为原料，在酸性条件下水解合成羟基乙酸，并采用络合萃取法和溶剂溶解法分离羟基乙酸。

The side chain of thioacetic acid has been sythesized from the material of acetic acid via four steps, then synthesized the key intermediate of 2-hydroxypenem via displacement, P〓induced cyclization and hydrolyzed reaction from the material of azetidinone.

以羟乙酸为原料，经四步反应合成了侧链化合物硫基取代的羟乙酸，发生取代反应导入到经七步合成的单环氮杂环丁酮中，然后发生酰化，Wittig诱导环化，水解等五步反应合成关键中间体2-羟甲基青霉烯。

The two indexes, degree of hydrolysis and 10% trichloroacetic acid-soluble nitrogen content, were used to compare the four kinds of proteolysis in naturally .

以蛋白水解度和10%三氯乙酸可溶性氮含量为指标，比较四种蛋白酶在两种工艺下水解的情况。

The dissociation constants and the reaction rate constants of inclusion complexes formed between α、β—cyclodextrin and several naphthyl esters (α—naphthyl acetate,β—naphthyl acetate,β—naphthyl caproate) were obtained by kinetics of hydrolyses of naphthyl esters.

通过几种脂肪酸萘酯(乙酸-α-萘酯、乙酸-β-萘酯、己酸-β-萘酯)的环糊精催化水解研究得到了它们同环糊精所形成的包接络合物的分解平衡常数和反应速度常数，进而提出了它们同环糊精所形成的包接络合物的结构模型。

In order to improve the thermal stability of yellow iron oxide pigments, a new balance precipitant coating silicon method with ethyl acetate as potential acid by controlling the dehydrolysis velocity of ethyl acetate was used.

为了改善铁黄颜料的耐热性，运用乙酸乙酯作为潜伏性酸试剂，研究了一种新的铁黄表面均匀包覆二氧化硅的方法，即通过控制乙酸乙酯的水解速率来实现在铁黄表面均匀包覆二氧化硅。

Research from the stability of the polymer gel system,this paper carried out the foll...

从研究聚合物凝胶体系稳定性出发本文主要开展了以下工作；(1)从聚合物类型(PHPAM、AP-P4和KYPAM-2)、分子量、水解度方面研究了聚合物凝胶体系的成胶性能，实验结果表明，KYPAM-2在60℃、80℃下与乙酸铬交联剂、70℃和90℃下与有机酚醛交联剂形成的凝胶体系30天粘度保留率85%—94%，而AP-P4聚合物在相同条件下形成的凝胶体系30天粘度保留率80%—90%；中、低水解度(15-25%)聚合物形成的凝胶稳定性较好(30天粘度保留率9036-94%)。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。