共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
以四丁基溴化铵为相转移催化剂,无水K2CO3为碱性催化剂,邻苯二甲酰亚胺与β溴代丙醛缩乙二醇经Gabriel反应合成了标题化合物。在邻苯二甲酰亚胺与β溴代乙二醇缩丙醛的物质的量比为1.1∶1,反应温度100~103℃,反应时间3.5h,在此条件下,收率达95.9%。 相似文献
11.
2,3-戊二酮是一种奶香型食用香料,以经典的亚硝化法合成2,3-戊二酮,即以2-戊酮为原料,使用亚硝酸异戊酯为亚硝化试剂,在浓盐酸存在下进行亚硝化反应,生成3-肟-2-戊酮,再经过水解得2,3-戊二酮,总反应得率达48.2%。 相似文献
12.
《Catalysis communications》2007,8(8):1202-1208
Cellulose supported dendritic Sn complexes were prepared by solid phase synthetic methodology. A series of cycloketones and acyclic ketones including 2-andamantanone, cyclohexanone, 4-methylcyclohexanone, 4-tert-butylcyclohexanone, 3-methyl-2-pentanone, 4-methyl-2-pentanone and cyclopentanone were oxidized by hydrogen peroxide in a reaction catalyzed by cellulose-supported dendritic Sn complexes, affording the corresponding lactones or esters with the conversion of 70–99% and the product selectivity of 100%. The catalysts can be recycled for several times without any significant decline in catalytic activity. 相似文献
13.
14.
15.
16.
17.
Jet fuel range branched alkanes were first synthesized under solvent-free conditions by the aldol condensation of furfural and 3-pentanone from lignocellulose followed by the one-step hydrodeoxygenation (HDO). Among the investigated solid base catalysts, CaO and KF/Al2O3 demonstrated the highest activity for the aldol condensation reaction of furfural and 3-pentanone. The aldol condensation product of furfural and 3-pentanone (liquid at room temperature) was directly hydrodeoxygenated to 4-methyl-nonane and 4-methyl-octane. These alkanes have low freezing points (174.1 K and 159.8 K) and can be blended into jet fuel without hydroisomerization. Among the investigated HDO catalysts, the Ni-Cu/SiO2 exhibited the best performance. 相似文献
18.
19.
20.
制备了Na2CO3/γ-Al2O3和NaOH/γ-Al2O3固体碱催化剂,考察了载体种类和其它制备条件对固体碱碱量的影响,并将其用于催化甲醛和正丙醛反应合成三羟甲基乙烷。具体如下:37%的甲醛60mL,加入1g固体碱Na2CO3/γ-Al2O3,然后在搅拌的条件下缓慢滴加98%的正丙醛20mL,于35℃下反应3h。反应完成后,将固体弱碱Na2CO3/γ-Al2O3与反应溶液分离,然后再加入1g固体强碱NaOH/γ-Al2O3,于70℃下反应3h,TME产率最高可达86.2%。 相似文献