排序方式: 共有11条查询结果,搜索用时 15 毫秒
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N—烃氧丙酰基四氢噻唑—2—硫酮的合成 总被引:1,自引:0,他引:1
在三聚氯氰存在下由烃氧丙酸与四氢噻唑-2-硫酮反应得到N-烃氧丙酰四氢噻哇-2-硫酮(2a-i),由2a,c-h与格氏试剂反应得到烃氧乙基苯基酮(3a,c-h).产物2a-i未见报道. 相似文献
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LI Jing SHANG Yan-mei XIAO Chuan SONG Zhi-guang LI Ye-zhi HUANG Hua-min .College of Chemistry Jilin University .School of Public Health Changchun P.R.China .Key Laboratory for Supramolecular Structure Materials of Ministry of Education Changchun 《高等学校化学研究》2009,25(1)
(R)-4-Hydroxymethyl-2-thioxo thiazolidine as a new chiral catalyst in the asymmetric addition of diethyl-zinc to benzaldehyde was synthesized from (R)-4-hydroxymethyl-2-thioxo thiazolidine carboxylic acid and its crystal structure was determined by X-ray diffraction method. The compound was crystallized in the orthorhombic system, space group P212121 with unit cell dimensions a=0.67253(12) nm; b=0.89164(17) rim; c=1.06146(19) nm, volume 0.6365(2) nm3; Z=4, calculated denisity 1.557 Mg/m3; absorption coefficient 0.733 mm-1; F(000)=312. The X-ray crystal structure analysis reveals that the compound has a thione group. 相似文献
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环空后台阶管道内气固两相流动的数值模拟研究 总被引:1,自引:0,他引:1
环空管道后台阶突扩流动是空气正循环钻井过程中十分重要的关键部分,直接决定了钻探岩屑是否能够顺利上返地面.本文采用Euler-Lagrange两相流研究方法,气相湍流采用Realizable k-ε模型,固相采用离散相模型(DPM),固相的湍流耗散采用随机轨道模型,对环空后台阶突扩管道内气固两相流动进行了数值模拟研究.得出了气相场大涡演变规律,在此基础上研究了不同粒径时颗粒在流道中的浓度分布规律、运动轨迹,以及速度场分布规律.这为细观框架下研究气固两相相互作用规律提供了依据. 相似文献
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吡喃酮是许多天然产物的结构单元,我们曾由4-异丁酰基庚二酸在过量醋酸酐及乙酰氯存在下回流得到7-氧代-8,8-二甲基-△~9-六氢香豆素.本文由二氰乙基-β-二酮进行酮解水解反应得到4-酰基庚二酸1_(a-c)。 在过量醋酸酐、乙酰氯存在下由1_a、1_c为底物进行反应没有得到双环的香豆素衍生物.其产物和单纯以乙酐为缩合剂时的产物2_a、2_c相同,产率分别为68%、63%。2_c可在硫酸铁催化 相似文献
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SHANG Yan-mei LI Jing ZHANG Ping SONG Zhi-guang LI Ye-zhi HUANG Hua-min 《高等学校化学研究》2007,23(6):669-673
A series of carboxylic acids was esterified to the corresponding esters with TiCl_4 as catalyst at room temperature,in high yields.This catalyst was highly effective for the selective esterification of primary alcohols with carboxylic acids,in the presence of secondary alcohols,and for the selective esterification of saturated acid with alcohol in the presence of conjugated acid or aromatic acid.On account of the high yield,high chemoselectivity,mild condition,and being free of other dehydrants,this is an efficient method. 相似文献
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SHANG Yan-mei LI Jing SONG Zhi-guang LI Ye-zhi HUANG Hua-min 《高等学校化学研究》2007,23(4):430-432
A series of esters of R-tetrahydrothiazo-2-thione-4-carboxylic acid[R-TTCA] was synthesized by direct esterification of R-TTCA with alcohols(CH3OH,C2H5OH,n-C3H7OH,i-C3H7OH,n-C4H9OH,sec-C4H9OH)in the presence of TiCl4 as the catalyst at room temperature without using any other solvent or dehydrant in high yields,91.6%-99.1% for primary alcohols and 55%- 80% for secondary alcohols.The catalyst has a strong chemoselective activity for the esterification of primary alcohols with R-TTCA in the presence of secondary alcohols.Owing to high yield,high chemoselectivity,and mild conditions used,this is an efficient method for the esterification of primary alcohols with R-TTCA. 相似文献
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WANG Lei~ ZHENG Qing-chuan~ SONG Zhi-guang~ ** FANG Wei-shuo~ LI Ye-zhi~ HUANG Hua-min~ . College of Chemistry . State Key Laboratory of Theoretical Computational Chemistry Jilin University Changchun P. R. China . Institute of Materia Medica Chinese Academy of Medical Sciences & Peking Union Medical College Beijing P. R. China 《高等学校化学研究》2007,23(1):18-21
IntroductionOptimization of leading structures is an importantsector in the study and exploitation of medicine, andthe association of 2,2,4-trimethyl-3-hydroxyl-cyclohex-4-enecarboxylic acid (1) and isoserine derivatives isone of the best methods for the … 相似文献
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SynthesisandQuantumChemistryStudiesof(R)┐N┐(Propionylthiazolidine┐2┐thione┐4┐methoxycarbonyl)germaniumSesquioxide*LIYe-zhi**,... 相似文献