a compound that is needed in order to refine opium into heroin

the regioselective nitration of toluene and chlorobenzene with nitrates and supported nitrates on solid acid catalysts and supports in the presence of acetic anhydride is studied.

该文讨论了应用固体酸催化剂和载体，在醋酐存在下，采用硝酸盐和载体硝酸盐硝化甲苯和氯苯的选择性。

methods: potentiometric titration was adopted to determine the content of terbinafine hydrochloride using glacial acetic acid as solvent, acetic anhydride instead of mercury acetate.

方法：采用电位滴定法，以冰醋酸为溶剂，用适量醋酐代替现行标準中使用的醋酸汞，建立了测定盐酸特比萘芬原料药含量的方法；

this technique showed many advantages: low reaction temperature, mild reaction condition, high yield and purity, which was possible to replace acetic anhydride method to produce hmx.

该方法反应温度低、条件温和、产率高、产品纯度好，有望代替传统的醋酐法制备hmx。

a new synthetic method, in which n acetylation of l glutamic acid was proceeded in alkaline solution using acetic anhydride as acetylation agent, was described.

以l-谷氨酸为原料，在堿性条件下用乙酸酐作为乙酰化试剂一步合成n-乙酰-l-谷氨酸的新工艺。

litsea cubeba oil reacted with hydroxylamine sulfate to give citral oxime, which by dehydration with acetic anhydride in the presence of phase transfer catalyst gave lemonile.

用山苍子油直接同硫酸羟胺反应生成柠檬肟，再加入乙酐和相转移催化剂脱水得到柠檬腈。

sweet potato acetate starch was prepared by using the sweet potato starch as the raw material and the acetic anhydride as the acetyl agent in this paper.

以玉米淀粉为原料，以醋酸酐为乙酰化试剂，氢氧化钠为催化剂，利用微波辐射技术对醋酸酯淀粉的合成工艺和性能进行了研究。

by high acetylation of chitosan at n position with acetic anhydride in a homogeneous medium known as acetic solution–alcohol-pyridine system, water-soluble chitosan was prepared.

探讨了如何控制在均相条件下以高脱乙酰度的壳聚糖为主要原料，在乙酸水溶液- 乙醇- 吡啶介质中实现壳聚糖n位乙酰化反应的问题；

many of china「s producers adopt interrupter chloration process by brimstone catalyst, however continuous chloration reactor by acetic anhydride catalyst has been used abroad.

我国绝大多数氯乙酸生产企业采用以硫磺粉为催化剂的间歇氯化生产工艺，而国外大都采用连续化氯化反应器，以醋酐为催化剂。

in this paper, 1 acetylaminoanthraquinone was synthesized by using 1 aminoanthraquinone and acetic anhydride as starting materials and by using acetic acid as solvent.

本文以1 氨基蒽醌和乙酐为原料，乙酸作溶剂，合成了1乙酰氨基蒽醌。

in this paper, natural cotton cellulose was modified by the steam explosion, modified cellulose, acetic anhydride and fatty acids have been used to synthesize the long chain cellulose ester.

采用蒸汽闪爆技术对天然纤维素进行改性，并利用改性后的纤维素、乙酸酐和脂肪酸合成长支链纤维素酯。

the synthesis of monosaccharide ester catalyzed by lipase in organic solvents was studied, where monosaccharides and vinyl acetate or acetic anhydride serve as substrates.

研究了有机相中脂肪酶催化以单糖和乙酸乙烯酯或乙酸酐为底物的糖酯合成反应。

the results showed that the macromolecular modifiers are better than that of small molecular modifier acetic anhydride for reduction of antigenicity.

结果表明，大分子，特别是单甲氧基聚乙二醇的降低抗原性效果很好，但活力损失较大；

n-formyl-l-aspartic anhydride was prepared by the reaction of l-aspartic acid and formic acid with magnesium oxide catalyst in acetic anhydride solvent.

在乙酸酐溶剂中，以氧化镁为催化剂，l-天冬氨酸与甲酸进行甲酰化反应并脱水生成n-甲酰-l-天冬氨酸酐。

melissopalynology, the subject to study the pollen in honey, has developed three research means: slide-integrated technique, acetic anhydride technique and spore-tracker technique.

蜂蜜孢粉学是研究蜂蜜中花粉的科学，其研究方法已从整体封片法、醋酸酐分解法发展到追蹤孢子法。

experiments proved that before incomplete hydrolysis, acetic anhydride not only couldn」treplace acetic acid, but also had indirect masking action for the detection of impurities.

试验还证明，醋酸酐在未完全水解之前不仅不能代替醋醚，相反对与杂质检出有间接的掩蔽作用。

dme is a preferred substitute for chlorofluorocarbons and can derive a number of products with high value such as dimethyl carbonate, acetic acid, acetic anhydride and formaldehyde.

二甲醚是氯氟烃的替代品，用它可以开发一系列高附加值产品，例如碳酸二甲酯、醋酸、醋酐、甲醛等；

formyl l aspartic anhydride was prepared by the reaction of l aspartic acid and formic acid with magnesium oxide catalyst in acetic anhydride solvent.

在乙酸酐溶剂中，以氧化镁为催化剂，l 天冬氨酸与甲酸进行甲酰化反应并脱水生成n甲酰l 天冬氨酸酐。

the o-acetylation of tri-n-butyl citrate with acetic anhydride catalyzed by polyvinyl pyridine was explored.

采用聚乙烯吡啶为催化剂，对柠檬酸三丁酯进行o-乙酰化反应。