Study on thecolor reaction of the new reagent 3 - benzothiazolylazo - 2 , 6 - dihydroxybenz0ic acid btadhb w1th copper ion 二羟基苯甲酸与铜显色反应的研究
Spectrophotometric determination of trace molybdenum in plants and seeds with a new eagent 2 , 4 - dihydroxyphenylfuorone 二羟基苯基荧光酮用于光度法测定植物和种子中钼的研究
It is found that hypocrellin a , hypocrellin b and 5 , 15 - diphenyl - 2 , 3 - dihydroxychlorin ( dpcoh ) have stronger photodynamic effect than in hpd same concentration . 2 二羟基叶吩（ dpcoh ）在印g尬1的光敏剂浓度下，明显强于相同浓度hpd的杀伤效应。
The results show that : - bi is a good burning catalyst of double - base propellant and possesses an excellent ability to reduce pressure exponent 结果表明， 2 , 4 -二羟基苯甲酸铋是双基系推进剂良好燃烧催化剂，它能显著提高了双基推进剂的燃速，并降低压强指数。
Due to the unique high affinity and reversible interactions with diols , boronic acid - based fluorescent sensors can be used in carbohydrate sensing and recognition 摘要有机硼酸类荧光传感器可与二羟基化合物进行高亲和性且可逆地结合，故可用于糖类传感和识别。
Dihydroxybenzyl alcohol is synthesized from 3 , 5 - dihydroxybenzoic acid by acylation and reduction by sodium borohydride reagent systems , which gives a convenient synthetic method 摘要以3 , 5 -二羟基苯甲酸为原料，经酰化、硼氢化钠还原体系还原，合成了3 , 5 -二羟基苯甲醇。
In order to investigate the effect of 2 , 4 - dihydroxylbenzoate ( - bi ) on the combustion of double - base propellant , the combustion law of the propellants containing - bi was studied by means of the single frame amplification photography fl miniature thermocouple , the scanning electron microscopy ( sem ) and the link isis energy spectrum 摘要为了探索2 , 4 -二羟基苯甲酸铋对双基推进剂燃烧的催化作用，采用单幅放大彩色摄影法、型微热电偶技术、扫描电镜和电子能谱研究了含2 , 4 -二羟基苯甲酸铋双基推进剂的燃烧规律。
Chemical company located in the garden city of hubei avenue traffic developed , hubei is one of the key enterprises , the main production of medicines , pesticides intermediate , the main product b chloride , chlorine b chloride , phenol de mdma , 2 , 3 - amounts jiben formaldehyde , 2 , 3 - two chlorobenzene formaldehyde , 3 , 5 - two regards formaldehyde , the benyi methadone , the benyisuan 仙桃市金联化工有限公司位于交通发达的湖北仙桃，是湖北省重点企业之一，主要生产各种医药、农药中间体，主要产品乙酰氯、氯乙酰氯、对苄氧基苯酚、 2 ， 3 -二甲基苯甲醛、 2 ， 3 -二氯苯甲醛、 3 ， 5 -二羟基苯甲醛、联苯乙酮、联苯乙酸。
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 synthesized by methylating from 6 , 7 - dihydroxy coumarin with an overall yield of 74 . 4 % . the procedure was practical . its structure was confirmed by ir and 1hnmr 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。
Through molecular design , a series of liquid crystalline copolyesters , which possibly possessed the auxetic behavior , were prepared by solution condensation reaction between 2 , 5 - bis ( p - alkoxy benzoyloxy ) hydrobenzoquinone , 4 , 4 ' - ( decanoxy ) dibenzoyl chloride and 4 , 4 ' - dihydroxy - oc , co - diphenoxydecane 经分子设计，通过2 ， 5 ?二(对烷氧基苯酰氧基)对苯二酚、 4 ， 4 ’ ?二羟基? ， ?二苯氧基癸烷和4 ， 4 ’ ? (癸二酰氧基)二苯甲酰氯之间的缩合反应合成了一系列具有负泊松比潜能的液晶共聚酯。
