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This paper reviewed the research development and systhesis of acetals and ketal flavors. 综述了缩醛(酮)反应的研究进展,重点介绍了缩醛(酮)类香料的合成方法。
acetal and ketal 缩醛（酮）
The synthetic conditions of acetals and ketals catalyzed by copper sulfate were studied. 研究了硫酸铜催化缩醛(酮)的合成条件,考察了硫酸铜催化剂的使用性能;
The hydroxyl groups can be changed into esters, ethers, acetals and ketals, etc. 最常用的羟基保护基可归纳为三类：酯类、醚类和缩醛或缩酮类。
The acetalization and ketalization of various aldehydes and ketones with catechol by using HY zeolite as catalyst were studied. 研究了HY分子筛催化邻苯二酚与环己酮、丁酮、丙酮、丙醛、丁醛、异丁醛、戊醛、异戊醛、正己醛、正辛醛、苯甲醛、二苯甲酮等十余种醛(酮)的缩合反应。
FeCl_3 URUSHIOL RESIN CATALYZED SYNTHESIS OF ESTER, ACETAL AND KETALS FeCl_3-漆酚树脂催化合成酯、缩醛和缩酮的研究
No ethyl acetate and cyclohexane were determined in specimen. 被测样品中未检测出环己烷,检出乙酸乙酯。
During the test run of 2000 h,the conversion of acetal and the yield of ethyl vinyl ether maintained about 96. 研究了在固体催化剂上乙缩醛气相分解制乙烯基乙醚的反应性能。
The promotion action of ionic liquid as an accelerant in synthesizing benzaldehyde ethanediol acetal and benzaldehyde propanediol acetal was studied. 摘要以离子液体为促进剂，强酸性聚苯乙烯732催化了苯甲醛与两种二元醉的缩醛反应。
The result shows that the pigment can be well obtained by using 30% Acet and 5% NaOH. The green powered pigment is obtained. The pigment is stable to light, heat and glucide. 结果表明 ,在 3 0%25丙酮及 5%25氢氧化钠溶液中易于提取 ,得到绿色粉末状色素 ,该色素对光、热和糖类具有较好的稳定性。
I hit him fair and square on the jaw. 我不偏不倚打中他的下巴。
The result shows that the pigment can be well obtained by using 30% Acet and 5% NaOH.The green powered pigment is obtained.The pigment is stable to light, heat and glucide. 结果表明,在30%25丙酮及5%25氢氧化钠溶液中易于提取,得到绿色粉末状色素,该色素对光、热和糖类具有较好的稳定性。
It is a fact of life and you must face it. 这是严酷的现实，你必须面对它。
She and I can't live under the same roof. 她和我不能住在一起。
She had to scrimp and save to pay for her holiday. 她不得不为付假期的费用而苦苦攒钱。
This paper reports the using of molybdophosphoric acid in synthesizing heptyl aldehyde ethylene acetal and meanwhile probes into the synthesizing conditions. 介绍了磷钼酸在乙二醇和庚醛缩合反应中的应用,探讨了乙二醇缩庚醛的合成条件。
I'll try and rustle you up something to eat. 我设法给你弄点吃的。
He sprang up and rushed to the door. 他跳起身，跑到门口。
He took sick and died a week later. 他得了病，一周后就死去了。
He's been in and out of prison for years. 他多年来屡次进出监狱。