查询词典 hydroxy acid

Abstract—3b-Hydroxy-12-oleanen-27-oic acid was an antitumor active oleanane-type triterpenoid from the rhizomes of Astilbe chinensis.

摘要- 3B型-羟基- 12 - oleanen - 27 -乌苏酸是一个抗肿瘤活性齐墩果烷型三萜从根茎 astilbe中华。

Twenty multiparous and ten primiparous Holstein cows were used to in- vestigate effects of supplementing dairy cow diets with Alimet (DL, 2- hydroxy-4- butanoic acid; HMB; Novus International Inc.) on DMI and milk production.

20多子和10头荷斯坦奶牛初产被用来在， vestigate补充与Alimet（消旋，2奶牛饲料的影响-羟基- 4 -丁酸； HMB；诺弗司国际公司） DMI和牛奶的生产。

In comparison,the rhizobia in mature infected cells were larger,greater in number,varied in shape,and distributed throughout the nodule cells.The rhizobia in the mature cells also had poly-hydroxy butanoic acid and curapos.

成熟侵染细胞中，根瘤菌个体较大，数量较多，多呈棒状，少数为球形或椭球形，有很多根瘤菌还呈现明显的"T"形、"Y"形或"V"形，菌体占满了整个细胞，这时的根瘤菌大多数含有聚羟基丁酸和聚磷酸盐颗粒。

Ethyl 4-[(1-hydroxy-1-methyl)ethyl]-2-propyl-1H-imidazole-5-carboxylate,the key intermediate of Olmesartan ,was synthesized from butanoic acid and o-phenylenediamine via condensation under microwave-irradiation,oxidation,esterification and the Gringard reaction.

用正丁酸与邻苯二胺为原料，在微波照射下缩合成2-丙基苯并咪唑，再氧化开环制得2-丙基咪唑二羧酸，再经酯化、Gringard反应制得抗高血压药物奥美沙坦的关键中间体2-丙基-4-[(1-羟基-1-甲基)乙基]-1H-咪唑-5-羧酸乙酯，总收率32.2%。

The reaction between 2-hydroxy benzoic acid and 3-methyl-1-butanol using phosphotungstic acid as catalyst were studied and the best catayst amount, react'ratio and reaction time were also discussed.

研究以磷钨酸为催化剂，由水杨酸与异戊醇制备水杨酸异戊酯的工艺条件，找到最佳催化剂用量，最佳反应时间及醇酸摩尔比，并研究了带水剂对反应收率的影响。

Results Six compounds were isolated and identified as:5α,8α-epidioxy-(22E,24R)-ergosta-6,22-dien-3β-ol,scopoletin,isofraxidin,p-hydroxy benzaldehyde,3,4,5-trimethoxy benzoic acid,protocatechuic acid ethyl ester...

结果得到6个化合物，分别鉴定为：5α，8α表二氧(22E，24R)麦角甾6，22二烯3β醇、东莨菪素、异秦皮啶、对羟基苯甲醛、3，4，5三甲氧基苯甲酸、原儿茶酸乙酯。结论化合物Ⅰ～Ⅵ均为首次从该属植物中分离得到。

The title compound was synthesized from shikimic acid via eight steps, including esterification of acid, proctection of hydroxy etc., and partial procedure was modified for easy industrialization.

本论文参考文献方法，以莽草酸为原料，通过酯化，丙酮叉保护等六步反应合成了目标化合物，并对部分反应条件进行了优化。

Two new active esters of acrylic acids monomers, N-p-acryloxybenzoyloxy succini-mide and N-p-methacryloxybenzoyloxy succinimide have been synthesized and polymerized.ABOSu and MBOSu were prepared by coupling of p-acryloxybenzoic acid or p-methacryloxybenzoie acid with N-hydroxy succinimide in the presence of dicyclohexylcarbodimide.

新的丙烯酸活性酯，N-(对甲基丙烯酰氧苯甲酰氧基)丁二酰亚胺及N-丁二酰亚胺单体分别由对甲基丙烯酰氧基苯甲酸、对丙烯酰氧基苯甲酸与N-羟基丁二酰亚胺在环已基羰二亚胺存在下经偶联反应合成。

Methods 4-Hydroxy- benzonitrile was treated with sodium hydrogen sulfide and anhydrous magnesium chloride in dimethyl formamide to give thioamide, which was then directly cyclized with ethyl 2-chloroacetoacetate without separation to give ethyl 2-(4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(2) in one-pot; then 2 was formylated with Duff reaction adopting hexamethylenetetramine in trifluoroacetic acid to give ethyl 2-(3-formyl-4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(3); finally, the target compound was obtained by the treatment of 3 with hydroxylamine hydrochloride and sodium formate in formic acid.

采用&一勺烩&方法，以4-羟基苯甲腈为起始原料，首先与硫氢化钠和无水氯化镁在N，N-二甲基甲酰胺中反应，所得中间体不经分离，直接加入2-氯乙酰乙酸乙酯进行环合反应，得到2-(4-羟基)苯基-4-甲基-5-噻唑甲酸乙酯（2）；然后通过六亚甲基四胺/三氟乙酸进行Duff反应，得到2-(3-甲酰基-4-羟基)苯基-4-甲基-5-噻唑甲酸乙酯（3）；再经盐酸羟胺/甲酸/甲酸钠体系脱水得到目标化合物。

The result showed that the contents of p hydroxy benzoic acid,vanillic acid(extracted by 1mol·L -1 NaOH) in continuous cropping soil were significant higher than that in normal cropping soil,and the content of vanillin had no significant difference in these soils.

结果表明，重茬土壤中对羟基苯甲酸和香草酸的含量(1mol·L-1NaOH提取)大于正茬土壤，且差异达到极显著水平，香草醛含量差异不显著；重茬大豆根系水提液中对羟基苯甲酸、香草酸、阿魏酸、香草醛、香豆素含量均高于正茬。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。