查询词典 anhydride

EMA is Monsanto's trademark for a series of white, odorless, freeflowing resins made by copolymerizing one mole of ethylene with one mole of maleic anhydride.

EMA 是蒙山都公司生产的一组树脂的商标，这些树脂白色、味、动性好，是经1克分子马来酐聚合而成的。

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。

Preparation of starch succinate with low substitution degree was studied by using corn starch as raw material,succinic anhydride as esterifying reagent,water as solvent and sodium hydroxide as catalyst.

以玉米淀粉为原料，丁二酸酐为酯化剂，以水为媒介，氢氧化钠为催化剂对低取代度淀粉丁二酸酯的制备工艺进行了研究。

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。

Based on green chemistry,the cleaner production of HPMA(hydrolyzed polymaleic anhydride) has been studied.

以绿色化学为基础，研究了水解聚马来酸酐的绿色合成工艺。

The characteristics of light sulfurized and esterified castor oil ①It's shown by the IR and LC-MSD that the sulfurized castor oil esterified with acid anhydride on 12-hydroxyl forms single, di and tri-esters.

流变性能：使0.5％S、1％S、2％S和3％S轻度硫化蓖麻油的粘度从327增加到545，粘度指数从135减小到100；倾点从-25℃上升到-15℃；碘值从90.6mgI／100g减小到88.5mgI／100g，测定实际的硫含量从0.412％增到2.6％；表明不饱和程度在减小。

Part I, the Friedel-Crafts acylation on DAA and methyl dehydroabietic acid was carried out with acetyl chloride, benzoyl chloride or phthalic anhydride as acylating regents, anh- ydrous aluminum chloride as catalyst and with different solvents to compare with, we have got t- hree new compounds.

第一部分，分别以脱氢松香酸和脱氢松香酸甲酯为底物，乙酰氯、苯甲酰氯、邻苯二甲酸酐为酰化试剂，无水三氯化铝作催化剂，采用不同的溶剂及反应条件进行傅克酰基化反应，得到3个新化合物。

Terpolymer of acrylic acid/acrylic amide/malefic anhydride was synthesized and mixed with polyepoxysuccinic acid in order to improve the scale and corrosion performance of the latter in this study.

为了提高PESA的阻垢缓蚀性能，合成了丙烯酸／丙烯酰胺／马来酸酐三元共聚物，与聚环氧琥珀酸进行物理复配，考察了温度、反应物配比及浓度对复配产品阻垢和缓蚀性能的影响。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。