排序方式: 共有96条查询结果,搜索用时 0 毫秒
91.
92.
在制备取代的1,4-己二烯过程中,在钯(Ⅱ)催化下烯丙基溴对1,4-二氯-2-丁炔的加成反应生成了一系列未曾预料的复杂产物,运用气相色谱-质谱法(GC-MS)对产物进行了逐个分析。分析结果显示:(1)8个化合物中除两个为预期产物外,其余均为氯和溴交换反应的副产物,并且8个化合物中的每两个为一对几何异构体;(2)4对几何异构体中Z/E的比例随着分子量的增加而逐渐下降。 相似文献
93.
Citronellal was the major product of catalytic oxidation of dihydromyrcene with oxygen using the catalyst comprised of (MeCN)2PdC1NO2 and CuC12 in a tertiary alcohol in supercritical carbon dioxide. It was found that the chemoselectivity of the reaction and the yield of citronellal were greatly affected by the pressure of carbon dioxide, the reaction temperature and the molar ratio of Pd/Cu. 相似文献
94.
95.
1INTRODUCTION Sulfoxides have been widely used in the separa-tion of palladium from other platinum-group metals by solvent extraction[1~3].They usually form extrac-tant-Pd(II)complexes PdCl2(R2SO)2in the extrac-tion process.It is well known that dialkyl sulfoxides have better affinity towards Pd(II)than those aromatic sulfoxides[4,5].So far,this phenomenon is poorly understood theoretically.Various calcula-tions have been performed in geometry optimiza-tions,NMR and S=O bond disso… 相似文献
96.
采用锡粒氧化-水热法,合成了纳米二氧化锡粉体,并用FT-IR,XRD,TEM和DTA等测试手段,对其结构和形貌进行了表征。研究了反应温度、时间、介质及压力对粉体粒度、形貌的影响。结果表明,在180℃水热反应12h,可以得到粒径为4~10nm具有四方相锡石型的二氧化锡粉体:以无水乙醇为反应介质时粒子间的团聚程度明显降低;增大反应压力,颗粒间的团聚程度减小。 相似文献