1.Then,the mixture of 65%～68% nitric acid,glacial acetic acid and acetic anhydride was dropped slowly to 3-fluoroanisole at 60℃ for 1h(3-fluoroanisole and nitric acid molar ratio 0.0624∶0.0721,glacial acetic acid and acetic anhydride volume ratio 10.6∶7.6) on water bath to produce 3-fluoro-4-nitroanisole in 48.7% yield(bp 151.2 ℃).
然后在60℃水浴中缓慢滴加65%~68%的发烟硝酸、冰乙酸和醋酐的混合液(间氟苯甲醚与浓硝酸的摩尔比为0.0624∶0.0721、冰乙酸与醋酐的体积比为10.6∶7.6),苯环上4-位硝化1 h后得3-氟-4-硝基苯甲醚,产率48.7%,沸点151.2℃。
2.The acetanilide was synthesized from phenylamine, acetic anhydride, and acetic acid. The effects of reaction time, amounts of acetic anhydride and acetic acid on the yield of acetanilide were investigated.
以苯胺、乙酸酐、乙酸为原料合成乙酰苯胺,考察了乙酸酐用量、乙酸用量、反应时间对乙酰苯胺收率的影响。
3.The experimental results show that in the presence of acetic anhydride, the L-tyrosine can be completely racemized and converted into DL-tyrosine both in NaOH aqueous solution and in acetic acid solvent, and moreover, in the presence of acetic anhydride, the L-tyrosine is racemized more rapidly in acetic acid solvent and a higher yield of DL-tyrosine can be achieved.
今讨论了在碱性水溶液中,L-酪氨酸、乙酸酐和NaOH三者摩尔比例对消旋过程的影响和在纯乙酸溶剂中,乙酸用量和L-酪氨酸与乙酸酐的摩尔比例与消旋温度对消旋过程的影响。
4.The hydroxyl number of polyester diols with different molecular weight (M=1 100~12 ooo) has been determined by end-group analysis, which include acetic anhydride/perchloric acid/acetic acetate and acetic anhydride/pyridine method.
用醋酐／高氯酸／乙酸乙酯法、醋酐／吡啶回流法，分别对相对分子质量为1100～12000的聚酯进行了羟值的测定，并用蒸气压渗透法和析出物溶解重滴法进行了核对。
5.The technology of synthesizing terpineyl acetate has been studied by using the method of microwave interval irradiation. The results showed that the optimized conditions were as the follows: the ratio of acetic anhydride to terpineol was 1.25:1,4% acetic anhydride were used as catalyst (based on rosin weight) under 100W microwave, and the irradiation time was 2h, respectively.
采用微波间歇辐照方法研究了微波辐照下乙酸松油酯的合成,确定的最适工艺条件为:催化剂磷酸-乙酐用量为原料量的4%、微波功率100W、反应时间2h、酐醇比1.25∶1。
6.The acetylation of the hydrocarbon fraction of cedar wood oil with acetic anhydride～polyphosphoric acid and the prins reaction of d—limonene with acetic anhydride～paraformaldehyde have been studied.
本文研究了柏木萜烯与醋酐～多聚磷酸的乙酰化反应和d-芋烯与醋酐～多聚甲醛的Prins反应,经正交试验结果,柏木萜烯乙酰化反应得率为70％。
7.The effects of acetic anhydride on the enzyme activity for the hydrolysis of pNP-NAG have been studied. The results show that acetic anhydride can lead to reversible non-competitive inhibition at appropriate concentrations,and the IC_ 50 is estimated to be 9.0 mmol/L.
表明在醋酸酐浓度低于20.0mmol/L,酶的抑制作用是可逆的,测得醋酸酐对酶抑制的IC50为9.0mmol/L.
8.(1) The condensation of guaiacol with acetic anhydride using polyphosphoric acid (PPA) as catalyst gave either acetovanillone (Ⅰ) or the acetate of isoacetovanillone (Ⅱ), depending on the amount of acetic anhydride used.
(1)用PPA作接触剂使??木酚和醋酸酐进行?合,因醋酸酐用量不同得到?芍纸Y果:第一,当??木酚和醋酐之量为当量时,产物为香??乙酮(Ⅰ); 第二,当醋酸酐大过量时,产物为?香??乙酮(Ⅱ)的醋酸酯。
9.Cinnamic acid is synthesized by microwave radiation with benzaldehyde and acetic anhydride as raw materials and KF/K_2CO_3 as catalyst. The optimal conditions obtained by orthogonal experiment are as follows: molar ratio of benzaldehyde, acetic anhydride and KF/K_2CO_3 is 1∶3∶1,45; power of microwave 650W;
以苯甲醛、乙酸酐为原料、KF/K2CO3为催化剂微波快速辐射,并用正交试验优选出最佳合成工艺条件:n(苯甲醛)∶n(乙酸酐)∶n(KF/K2CO3)=1∶3∶1.45,微波功率650W,反应6min,产率可达76.09%。
10.The optimal mole ratio was p-toluidine:acetic anhydride:sulf uric acid =1∶1.3∶1.13.Acetic anhydride/mol p-toluidine was reduced from 3.10to 1.30mol,sulfuric acid /mol p-toluidine was reduced from 3.17to 3.13mol and reco very of solvent was over 95%.
最佳原料配比为对甲基苯胺∶醋酐∶硫酸=1∶1.30∶1.13。 改进后,每mol母体的醋酐用量由3.10mol减少至1.30mol,浓硫酸用量由3.17mol减少至1.13mol,溶剂回收率在95%以上。
