乙酰乙酸

Products: 3 - benzoyl-ethyl acrylate (97% min), acyl phosphorus acid methyl ester (98% min), P acyl three ethyl acetate (98% min), a phosphorus acid acyl The ethyl esters (98% min), 3 - bromine -1,3,4,5 - tetrahydrocannabinol -2 H-1-benzo-Aza Zhuo -2, 1 - naphthalene-tetrahydrocannabinol (98% min), 3,5 - dimethyl benzoyl chloride (99% min), 3,5 - dichloro benzoyl chloride (97% min), the ethyl benzoyl chloride (99% min), a TCA Ester (99.5% min), o-benzoyl methyl benzene (99% min), 4 - phenyl benzophenone (99% min): glacial acetic acid (99% min), methanol (99% min), liquid chlorine (99.5% min), caustic soda (30% min), isopropyl alcohol (99% min), anthranilic acid (99% min), dichloroethane (99% min ), Chunben (99% min), toluene 99% min

3-苯甲酰基丙烯酸乙酯（97%min）、磷酰基乙酸三甲酯（98%min）、磷酰基乙酸三乙酯（98%min）、磷酰基乙酸甲酯二乙酯（98%min）、3-溴-1，3，4，5-四氢-2H-1-苯并氮杂卓-2酮、1-四氢萘酮（98%min）、3，5-二甲基苯甲酰氯（99%min）、3，5-二氯苯甲酰氯（97%min）、对乙基苯甲酰氯（99%min）、氯乙酸甲酯（99.5%min）、邻苯甲酰基苯甲酸甲酯（99%min）、4-苯基二苯甲酮

Two synthetic routes of Caffeine have been determined and investigated after the analyzing and trying for the literal synthetic methods. In one route, the target compound was prepared from chloroacetyl chloride through six steps, the total yield is 50.5 %. In another route, the target compound was obtained from cyanoacetic acid through six steps, the total yield is 45%.

对目前咖啡因工业生产工艺进行了研究，并分析了咖啡因工业生产中所存在的问题，本文提出两条可行的工业化合成路线：一条是以氯乙酰氯为起始原料，经过六步反应制得目标化合物，总收率50.5％；另一条是以氰基乙酸为起始原料经过六步反应制得目标化合物，总收率45％。

Keywords isopropenyl acetate;acetyl acetone;vapor-liquid equilibrium

乙酸异丙烯酯；乙酰丙酮；汽液相平衡

The effects of reaction temperature on the yield and the purity of monochloroacetic acid under a determined molar ratio of raw materials were investigated.

用氯气与醋酸在氯乙酰氯催化下合成了一氯乙酸。

Rosolic acid reacted with acetic anhydride to synthesize rosolic acid -triacelate ester [tri(4-acetoxy) phenyl methane] under reflux condition.

以玫红酸、醋酸酐为原料，采用加热回流法合成了玫红酸三乙酸酯[三(4-乙酰氧基)苯基甲烷]。

Results: Solution concentration range depended on 0.5~50 mg/L lineaity, relation fine, the relevance modulus amounted to 0.999 without exception. The soursulfan acet ophenetidin ilamide potassium, benzoic acid, dehydro aectic acid, sorbic acid, saccharin sodium minium inspects up out tickness being 0.062, 0.074, 0.066, 0.370, 0.105mg/L The standard deviation was smaller than 5.0%. The additive hit hack rate was 96.8% in drink pickle and the nature bean product fermenting 101.6%.

结果：本方法测定食品中5种添加剂，溶液浓度范围在0.5~50mg/L线性关系良好，相关系数均达0.999；乙酰磺胺酸钾、苯甲酸、脱氢乙酸、山梨酸、糖精钠最小检出浓度分别为0.062，0.074，0.066，0.037，0.105mg/L；标准偏差均小于5.0%；饮料、酱菜和发酵性豆制品中添加剂的回收率为

For example, pulverized wood samples can be treated with acetyl bromide in acetic acid, and the absorbance of the resulting solution at 280 nm can be compared with the absorbance obtained from known lignin standards.

例如，将木屑样品在乙酸环境下与乙酰溴进行反应，再将280纳摩尔所得溶液的吸收率与已知的木质素标准吸收率进行比较。

The crystalline amide of acetic acid, CH3CONH2, used as a solvent and ''.

乙酰胺乙酸的晶体胺，ch3conh2，用作溶剂和湿润剂，并用于油漆和炸药

The hydrolysis of glycosidic linkages in hemicelluloses and the b-O-4 ether bonds in lignin are catalysed by acetic acid formed at high temperature from acetyl groups present in hemicelluloses.

水解糖苷联系，在半纤维素和波- 4甲醚债券木质素是催化乙酸形成于高温，从乙酰集团目前在半纤维素。

The protein and the fatty compounds in the sample are precipitated by zinc acetate and potassium ferrocyanide, then the chromogenic reaction of acetylacetone with formaldehyde released from the sample in weak-acid medium and boiling bath takes place immediately.

提出了一种用於现场测定水发食品中甲醛含量的样品快速前处理新方法，采用乙酸锌和亚铁氰化钾沉淀样品中的蛋白质和脂肪，在弱酸性介质和沸水浴条件下提取了样品中的甲醛，并与乙酰丙酮立即发生显色反应。

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。