查询词典 acetic anhydride

Methods: fudr was esterified with acetic anhydride in the presence of pyridine and 4 dimethylaminopyridine.

在吡啶和4 二甲氨基吡啶存在时，fudr与乙酸酐反应，制备氟尿苷二乙酸酯，并测定其核磁共振氢谱。rp hplc测定其在正辛醇和磷酸盐缓冲液中的分配系数及不同ph缓冲液和组织匀浆中的稳定性。

Acetylated starches with high degree of substitution were synthesized from cornstarch with acetic anhydride as esterifying agent and methanesulphonic acid as catalyst.

以玉米淀粉为原料，醋酸酐为酯化剂，甲烷磺酸为催化剂，制备高取代度淀粉醋酸酯。

Methods: 2ethyl aniline was used as starting material of the synthesis and was processed by acetic anhydride acylation, strong nitric acid nitraction at low temperature, and desacyl synthesis to produce 2ethyl5nitro aniline. The product was then synthesized to 3methyl6nitro1Hindazole by using ringclosing reaction in the presence of NaNO2, and then ethylated to obtain 2,3diethyl6 nitro2Hindazole. The latter compound was then reduced by SnCl2/Hcl to get target compound 2,3diethyl6nitro2Hindazole.

以2乙基苯胺为原料经醋酐酰化、浓硝酸低温硝化及去酰基保护合成2乙基5硝基苯胺，后用亚硝酸钠关环得3甲基6硝基1H吲唑，经硫酸二甲酯甲基化得2，3二甲基6硝基2H吲唑，最后用氯化亚锡将其还原得到目标产物，通过1H NMR确定结构与目标产物一致。

Methods: 2-ethyl aniline was used as starting material of the synthesis and was processed by acetic anhydride acylation, strong nitric acid nitraction at low temperature, and desacyl synthesis to produce 2-ethyl-5-nitro aniline. The product was then synthesized to 3-methyl-6-nitro-lH-indazole by using ring-closing reaction in the presence of NaNO2, and then ethylated to obtain 2, 3-diethyl-6- nitro-2H-indazole. The latter compound was then reduced by SnC12/Hcl to get target compound 2, 3-diethyl-6-nitro-2H-indazole.

以2-乙基苯胺为原料经醋酐酰化、浓硝酸低温硝化及去酰基保护合成2-乙基－5-硝基苯胺，后用亚硝酸钠关环得3-甲基－6-硝基－1H-吲唑，经硫酸二甲酯甲基化得2，3-二甲基－6-硝基－2H-吲唑，最后用氯化亚锡将其还原得到目标产物，通过1HNMR确定结构与目标产物一致。

Catalytic synthesis of Aspirin over pretreated sodium acetate using salicylic acid and acetic anhydride as starting materials.

以水杨酸和乙酸酐为原料、无水乙酸钠为催化剂合成阿司匹林。

A new preparation method for antimony stearate by antimonous oxide, acetic anhydride and stearic acid was studied.

硬脂酸锑作为一种分子筛催化剂中有毒物质的钝化剂和一种新型的热稳定剂，可用于石油催化裂化、塑料、橡胶工业［1～3］。

Methods:A series of DMY acetates were synthesized with different ratio of acetic anhydride to DMY,the antioxidation capability of them for lard was determinated.

采用改变乙酸酐与二氢杨梅素投料比，合成不同酯化程度的二氢杨梅素酯，并用猪油体系测定其抗氧活性。

Four kinds of hemicyanine dyes are synthesized by condensation of the benzotellurazolium iodides with diphenylformamidine in acetic anhydride.

将苯并碲唑季铵碘盐与二苯甲脒在乙酸酐中缩合，得到了4个半菁。

The method is divided into two procedures: reacting antimonous oxide with acetic anhydride, and then the product reacting with stearic acid.

三氯化锑与碱金属或碱土金属硬脂酸盐反应［4，5］；2）氧化锑与硬脂酸在有机溶剂中反应［6］。

M Trifluoromethylacetophenone was synthesized by the reaction of acetic anhydride with the Grignard reagent of 3 bromo benzene prepared from trifluoromethylbenzene , in 40% overall yield.

以三氟甲基苯为原料，经过溴化、格氏反应后与乙酸酐反应合成间三氟甲基苯乙酮，总收率40%。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。