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31.
Niko S. Radulović Aleksandra S. Đorđević Bojan K. Zlatković Radosav M. Palić 《Chemical Papers》2009,63(4):377-384
Volatiles of fresh flowers of Prunus domestica L. and Prunus padus L. (their diethyl ether extracts) were analyzed by GC and GC-MS. 110 and 33 constituents were identified in P. domestica and P. padus extracts, respectively. 32 of the identified constituents were previously unreported as metabolites of taxa belonging to
the genus Prunus. Six of them (4-methoxybenzyl palmitate, isoamyl stearate, isoamyl eicosanoate, isoamyl docosanoate and penta-O-acetyl-α- and β-D-glucopyranoses) are compounds reported for the first time from a natural source and one (isoamyl tetracosanoate) is a new
compound in general. The major component of P. domestica extract was kaempferol (35.0 %), while P. padus extract was found to be rich in (Z)-8-hydroxylinalool (30.4 %), benzaldehyde (19.8 %) and 2-phenylethanol (15.1 %). Both extracts (P. domestica and P. padus) contained rather large amounts of shikimate metabolites (51.7 % and 39.1 %, respectively) and anther related odd-carbon
numbered alkanes (23.2 % and 27.0 %, respectively). The observed differences between P. domestica and P. padus extracts corroborate the placement of P. domestica and P. padus in separate subgenera (Prunus and Cerasus, respectively) of the genus Prunus. 相似文献
32.
Chuan Ming JIN Guo Yuan LU* Xiao Zeng YOU Department of Chemistry State Key Laboratory of Coordination Chemistry Nanjing University Nanjing 《中国化学快报》2001,(11)
Calixarenes are a versatile class of macrocyclic compounds which have attracted extensive interest due to their ability to form host-guest complexes and act as enzyme mimic, especially when appropriately functionalized1. Introduction of azo group to calixarenes can make the later to be easily detected in the process of molecular recognition, azo groups have been introduced into calixarenes by the diazo-coupling reaction of calix[4]arene with BF4- or chloride salt of substituted benzene diazon… 相似文献
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34.
锗钨酸催化合成水杨酸异戊酯 总被引:15,自引:0,他引:15
Isoamyl salicylate was synthesized by using germanotungtic acid as catalyst.The effects of the amaunt of catalyst,the molar ratio of salicycic acid of isoamy l alcohol,the reaction temperature and the reaction time on the yield of ester w ere studied.The optimum reaction conditions were 1.3∶100 (mass ratio) of cataly st to reactants,1∶2.5 (molar ratio) of acid to alcohol,135~153℃ being satisfa ctary reaction temperature and reaction time suitable being 3h.Under such condit ion,the yield of ester was up to 94%.Germanotungtic acid catalyst can be used re peatedly. 相似文献
35.
甲烷磺酸铜的合成及在催化酯化反应中的性能研究 总被引:6,自引:1,他引:5
合成了甲烷磺酸铜 ,其结构经热重分析和IR表征。研究了以其催化乙酸与异戊醇酯化反应的性能及各种因素对酯化率的影响。反应条件为 :乙酸 1 67mmol,n(乙酸 )∶n(异戊醇 ) =1 .0∶1 .1 ,催化剂用量 0 .2 5 % (以酸的摩尔数计 ) ,回流反应 2 .0h ,不加带水剂 ,酯化率可达 96.0 %。其催化活性远远高于CuSO4·5H2 O ,CuCl2 ·2H2 O ,Cu(NO3 ) 2 ·3H2 O ,Cu(CH3 CO2 ) 2 ·H2 O及其它Lewis酸催化剂 ,而且反应过程中不水解 ,反应后经过简单的相分离即可重复使用 ,并成功地用于催化合成其它酯。 相似文献