广义逆A^(3)和A^(4)的通式

对于给定的m×n复矩阵A,令A(3)、A(4)和A(3,4)分别表示A〔3〕=〔X∣AX=X*A*〕A〔4〕=〔X∣XA=A*X*〕,和A〔3〕∩A〔4〕中的任意一个矩阵,给出了A〔3〕、A〔4〕、和A〔3,4〕的通式。

Magnetic CuO nanoparticles supported on graphene oxide as an efficient catalyst for A^3-coupling synthesis of propargylamines

Magnetically separable CuO nanoparticles supported on graphene oxide（Fe3O4 NPs/GO-CuO NPs） is synthesized and characterized for the preparation of propargylamines in EtOH,at 90 C.Fe3O4 NPs/GOCuO NPs is found to be an efficient catalyst for the A^3-coupling of aldehydes,amines,and alkynes through C-H activation.Both aromatic and aliphatic aldehydes and alkynes are combined with secondary amines to provide a wide range of propargylamines in moderate to excellent yields.

白胡椒中的CYP3A4抑制物质二哌拉酰胺A～E的结构

已知胡椒中含有的胡椒酰胺为抑制药物代谢酶CYP3A4的成分,由于胡椒的乙酸乙酯提取物中含有较胡椒酰胺抑制活性更强的抑制CYP3A4的成分,因此对活性物质进行纯化。