它是由有机二异氰酸酯或多异氰酸酯与二羟基或多羟基化合物加聚而成。
It is made of organic diisocyanate or polyisocyanate with two hydroxyl groups or polyhydroxy compounds together with.
总酚提 取物主要包括对羟基苯乙醇、3、4-二羟基苯乙醇、红景天苷以及以 其为母核的糖苷类化合物和其它衍生物。
The total phenol extract mainly contains hydroxyl mandelic, 3, 4-dihydroxy phenylethyl alcohol, salidroside and indicant compound and other derivatives with salidroside as the mother nucleus.
聚胺酯泡沫通过多羟基化合物上的羟基和二异氰酸酯反应形成。
The foam was prepared through a reaction of the hydroxyl groups with diisocyanate.
海水中的铀与吸附剂都是溶剂化的，二者接近以后，逐步共用一部分液膜，吸附剂上的羟基与带负电荷的铀质点结合成表面羟基化合物。
Both uranium and the adsorbent are solvated in seawater. They gradually share a part of their liquid membrane when coming into contact forming a surface hydroxyl compound, thus lowering the ?
标题化合物C24H22N2O2是由N-（4-羟基苯亚甲基）喹啉-5-胺和5，5-二甲基-1，3-环己二酮在氯化三乙基苄基铵（TEBAC）催化下以水作溶剂反应而得。
The title compound C24H22N2O2 has been synthesized by the reaction of N-arylidenenaphthalen-2-amine with 5,5-dimethyl-1,3-cyclohexadione water catalyzed by triethylbenzylammonium chlorideTEBAC.
在二氯甲烷溶液中，一氧化氮导致2,3 -环氧酮发生顺式开环反应，生成的顺式羟基硝酸酯化合物为主要产物。
Ring opening reaction of 2, 3-epoxy ketones with nitric oxide in dichloromethane occurred in a syn-selective fashion, producing syn-2-hydroxy nitrates as main products.
而羧基邻位有酚羟基存在时，则配体以双齿形式与钛配位形成二茂钛六元环状化合物。
And if there is a hydroxyl in ortho position of carboxyl, the oxygen of hydroxyl and carboxyl in ligand are bound to ti to form hexatomic cyclic compound.
P2NA生成二个酚类化合物，经与标准样品作平行层析证实为6-羟基P2NA和4＇-羟基—P2NA，而P1NA仅生成一个酚类化合物。
P2NA yielded two phenolic products identified by parallel chromatography with standard chemicals as 6-hydroxy-P2NA and 4-hydroxy-P2NA. P1NA yielded only one phenolic product.
用1%的氢氧化钠水溶液处理带有芳酰氧基的1,3 -丙二酮衍生物可以直接得到A环带有羟基的黄酮化合物。
Treatment of 1, 3-diketones containing benzoyloxy group in 1% aqueous sodium hydroxide can afford directly the corresponding ring-A hydroxylated flavone.
前言：以2′，5′-二羟基苯乙酮和原甲酸三乙酯缩合得到6- 羟基- 4- 色酮，再经催化氢化得到标题化合物。
6-Hydroxychroman was prepared by catalytic hydrogenation of 6-hydroxy-4-chromone, which was prepared via condensation of 2′, 5′-dihydroxyacetophenone with triethyl ortho-formate.
在乙腈、聚乙二醇存在下，8-羟基喹哪啶与硝酸铈铵反应生成标题化合物。
In the presence of acetonitrile and polyethylene glycol, 8-hydroxyquinaldine can react with cerium ammonium nitrate to form 5,7-dinitro-8-hydroxyquinaldine.
结果分离鉴定了2个二苯酮化合物，其结构分别为2 甲氧基- 3， 4 -亚甲二氧基-二苯酮（I）， 4 羟基-2， 6 -二甲氧基-二苯酮（II）。
Results A new benzophenone was isolated and identified as 2-methoxy-3,4-methylenedioxy-benzophenone (I), along with a known compound 4-hydroxy-2,6-dimethoxy-benzophenone (II).
结果分离鉴定了2个二苯酮化合物，其结构分别为2 甲氧基- 3， 4 -亚甲二氧基-二苯酮（I）， 4 羟基-2， 6 -二甲氧基-二苯酮（II）。
Results A new benzophenone was isolated and identified as 2-methoxy-3,4-methylenedioxy-benzophenone (I), along with a known compound 4-hydroxy-2,6-dimethoxy-benzophenone (II).
应用推荐