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- A variety of aldehydes were converted into acylals in good yields with anhydride in the presence of a catalytic amount of zinc bromide under solvent-free conditions. 以醛和酸酐为原料,溴化锌为催化剂,无溶剂条件下高产率地合成了偕二酸酯(其中醛与苯甲酸酐的反应是首次报道)。
- In the presence of a catalytic amount of concentrated sulfuric acid, p-aminobenzoic acid directly reacted with higher alkyl alcohol has afforded the p-amino benzoate in good yield. 摘要在催化量的硫酸存在下,对氨基苯甲酸与长链醇直接反应制得了一系列对氨基苯甲酸长链醇酯。
- Deprotection of acetylated glycoside in the presence of catalytic amounts of dibutyltin oxide in methanol was described. 摘要研究了以二丁基氧化锡为催化剂,在甲醇溶剂中,含有不同官能团的脂肪族糖苷的脱乙酰保护基反应。
- In the presence of catalytic amounts of tellurium,aryl chloroacetates can be cleaved by sodium borohydride and regenerate parent phenols in good yields. 在催化量碲粉存在下,氯代醋酸芳酯可被硼氢化钠裂解,以良好产率生成母体酚。
- The spirocyclopropane derivatives were readily converted into the corresponding methyl esters in nearly quantitative yields by treatment with absolute methanol containing catalytic amounts of sodium methoxide. 螺环化合物经甲醇钠催化下的甲醇解开环,定量得到氨基和羧基均被保护的6个开环产物;
- Some coumarin derivatives are synthesized from corresponding phenols through condensation with acetylacetic ester under microwave irradiation,with catalytical amount of phosphoric acid being added. 用磷酸作催化剂,采用微波辐射方式,以酚类化合物和乙酰乙酸乙酯为原料进行缩合反应,合成香豆素衍生物。
- He has a large amount of mail to answer every day. 他每天有大量的信件要回复。
- The carpet will stand any amount of wear. 这地毯极其耐用。
- The amount of a claim on an insurer by an insured. 险损赔偿额保险人从承保人获得的赔偿数量
- Synthesis of Disulfides by Metallic Samarium and Catalytic Amount Mercuric Chloride 用钐和催化量的氯化汞体系合成二硫醚
- A large amount was deceived by that deceiver. 一大笔钱被那个骗子骗走了。
- The total amount is in the fifties. 总共五十多个。
- Just think of the amount of time wasted. 想一想多少时间被浪费了。
- The amount of unemployed capital is very large. 未被利用的资金数量很大。
- My husband earns thrice the amount I earn. 我丈夫挣的钱是我的三倍。
- The railroad gives free transportation for a certain amount of baggage. 铁路免费运送的行李是有一定数量的。
- He gave her a fifth of the total amount. 他给了她总量的五分 之一。
- She has a fair amount of money put by. 她存了不少钱。
- His debts amount to 5,000 pounds. 他的债务共达五千镑。
- The amount by which actual costs exceed estimates. 超出费用实际费用超过预计费用量