查询词典 acetic acid

A series of 2-acetylformanilides were prepared,followed by thiolation with Lowesson reagent to afford 2-acetylthioformanilides,which further reacted with Mn3·2H2O in glacial acetic acid under microwave irradiation to afford 2-acetyl benzothiazole s.

合成了一系列的硫代酰胺，研究了它们在微波辐射醋酸锰作用下发生氧化自由基环化反应，成功地合成了一系列2-乙酰基苯并噻唑衍生物，其结构经红外光谱、核磁共振谱和质谱得到了证实

The acetate bicyclic guanidine has the above structure and is synthesized by a direct reaction of bicyclic guanidine and acetic acid in a catalyst-free aqueous solution.

所述的醋酸双环胍具有如上结构，是由双环胍与醋酸在无催化剂、水溶剂中直接反应合成。

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。

The liquid-liquid equilibrium binodal curves and the tie-line data of an epoxy cotton seed oil/acetic acid/water ternary system.

测定了环氧棉籽油－醋酸－水三元系分别在30℃，40℃，50℃，60℃下的液－液平衡双结点曲线，以及在40℃，50℃，60℃下的液－液平衡系线数据；分别应用物料衡算法和系线中点轨迹法对实验数据进行了检验。

Bromothiophene was synthesize d from thiophene through bromination to give 2,3,5-tribromothiophene,then reduced by Zinc in acetic acid.

以噻吩为原料，先和溴素反应合成2，3，5-三溴噻吩，再以锌作还原剂在乙酸溶剂中反应得到3-溴噻吩，主要研究了第一步反应时的原料配比对反应的影响及第二步的反应时间对反应的影响，反应总收率达72.6%。

Bromo-2′,4′-dichloroacetophenone was synthesized in three steps,w hich were bromization ,chlorination and acylation,from glacial acetic acid and m -dichlorobenzene.

以冰乙酸和间二氯苯为原料，经溴化、氯化、酰化三个步骤，制得 2—溴- 2′，4′-二氯苯乙酮，产率达 70 %。

Pyruvaldehyde was synthesized with acetone or 1,2 propanediol as starting material respectively.With n∶n=1 00∶0 79,3 0-4 0 g potassium chlorate as catalyst,and water and glacial acetic acid as solvent,refluxing on water bath of 60-75 ℃ for 4 h,bromoacetone was obtained in 63 5% yield.

分别用丙酮和 1，2 丙二醇做原料合成了丙酮醛。n∶n =1 0 0∶0 79，加入 3 0～4 0g氯酸钾做催化剂，水和冰醋酸做溶剂，水浴温度为 6 0～ 75℃，回流 4h ，制得产率为 6 3 5 %的溴丙酮。V∶V =11 9∶1 0 ，通入空气，在 6 5～ 70℃反应 5～ 8h ，制得产率为 5 9 6 %的丙酮醛。

Acetic acid ethenyl ester, polymer with ethenol, cyclic acetal with butanal

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MethodsMouse twisting numbers induced by acetic acid, mouse pain threshold after heat stimulation on hot-plate and in hot-water tests were observed to investigate the analgesic effects, meanwhile, the contents of prostaglandin E (PGE2) and malondialdehyde and the activity of superoxide dismutase in mice serum and cerebrum were measured to explore primary analgesic mechanisms of calonyction aculeatum beans.

方法采用醋酸致小鼠扭体法，小鼠热板法及小鼠温浴法，观察月光花豆乙醇提取物的镇痛作用，同时检测热板法小鼠的血清和脑组织PGE2、MDA的含量及SOD活性。

The results show that the decay of retinol and retinyl acetate are much faster in anionic micelles than that in cationic micelles and neutral micelles(TX-100), which indicate that the decay is carried out by the protonation of retinol or retinyl acetate first, then one molecular water or acetic acid is lost to produce the carbonium ion, which release the proton followed to generate the anhydroretinol.

数据显示，维生素A及其乙酸酯在阴离子胶束溶液SDS中的衰变速度要远大于在阳离子胶束溶液CTAB和中性胶束溶液TX-100中的衰变速度。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。