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Hydroxyquinol triacetate was prepared from p-benzoquinone by 1,4-addition reaction with acetic anhydride and then 6,7-dihydroxy coumarin was synthesized from it by hydrolyze and cyclization in concentrated sulfuric acid.Then 6,7-dimethoxy coumarin was syn
中文意思:
对苯醌与乙酸酐经1,4-加成生成1,2,4-苯三酚三乙酸酯,然后与苹果酸反应经水解、环合反应得6,7-二羟基香豆素,再经甲基化得到6,7-二甲氧基香豆素,总收率为74.4%,整个过程反应条件温和,操作方便,适合工业生产的要求,对产品结构进行了IR和1HNMR表征。


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Hydrostatic transmission, double drive, two amplitudes, 3 speed range, infinitely variable speed, good over-lap-ping. 全液压、双驱动、双振幅、三档无级变速,十字铰接式车架。
Hydrostatic transmission,double drive,two amplitudes,two gears and infinitely variable speed. 全液压、双驱动、双振幅、两档无极变速。
Hydrotherapy is especially effective to cancer under or on the skin. It is also very effective to all kinds of bruises, sprains, muscles pain, ligament, joint problems and injures, etc. 这方法特别对较近皮肤的癌症帮助较大,如皮肤癌、骨癌、喉癌等,亦对撞伤、扭伤、肌肉、韧带、关节等痛症和损伤十分之好。而全身冷热水浴对全身都有好处,有助增强抵抗力。
Hydrous magnesium oxysulfate whisker is a new type of fibroid material used as flame retardants and reiforcers. 摘要硷式硫酸镁晶须是新型的阻燃、增强纤维材料,有著广阔的应用前景。
Hydroxynitrile lyases are the versatile group of enzymes, which play a significant defensive role in plant system against microbial attack. 摘要醇腈酶是用途较广的一类酶,在植物体内抵御微生物侵袭方面起着重要作用。
Hydroxyquinol triacetate was prepared from p-benzoquinone by 1,4-addition reaction with acetic anhydride and then 6,7-dihydroxy coumarin was synthesized from it by hydrolyze and cyclization in concentrated sulfuric acid.Then 6,7-dimethoxy coumarin was syn 对苯醌与乙酸酐经1,4-加成生成1,2,4-苯三酚三乙酸酯,然后与苹果酸反应经水解、环合反应得6,7-二羟基香豆素,再经甲基化得到6,7-二甲氧基香豆素,总收率为74.4%,整个过程反应条件温和,操作方便,适合工业生产的要求,对产品结构进行了IR和1HNMR表征。
Hygienic standard for arsenic and its inorganic compounds in the air of workplace. 车间空气中砷及其无机化合物卫生标准.
Hygienic standard for environmental meteorology in underground workplace of coal mine. 煤矿井下采掘作业地点气象条件卫生标准.
Hygroscopic Able to absorb water from the surroundings, including moisture from the atmosphere. 吸湿的:指可以从周围环境中吸收水分,包括大气中的湿气。
Hymall's superstores are mainly in the east, north and north-east of China and serve about 2m customers a week. 乐购的超市主要位于中国华东、华北和东北地区,每周接待大约200万名顾客。
Hyman, S. Mental Illness: Genetically Complex Disorders of Neural Circuitry and Neural Communication.Neuron 28 (2000): 321-323. 《神经细胞》28(2000):321-323,〈精神疾病:由基因所引起的神经回路和神经通讯障碍.
 
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