[Study on the Extraction, Geometry Structure and Spectral Characterization of Piperine Alkaloid].

Using pepper fruit of Hainan as raw material and 95% ethanol as solvent, the alkaloid in pepper is extracted with reflux method in this paper. The piperonylic acid is removed by adjusting the pH; the fat-soluble substance being removed by adding ethyl ether; the piperine alkaloid being purified with acetone by recrystallization anddetected with HPLC, as well as characterized with IR. The characterizations of piperine are discussed.

[5-(Pyridin-2-yl)-1H-tetra-zole-κ(2) N (4),N (5)]bis(triphenyl-phosphane-κP)copper(I) tetra-fluoridoborate.

In the title Cu(I) compound, [Cu(C6H5N5)(C18H15P)2]BF4, the Cu(I) cation is N,N'-chelated by a 5-(pyridin-2-yl)-1H-tetra-zole ligand and coordinated by two triphenyl-phosphane ligands in a distorted tetra-hedral geometry. The tetra-zole and pyridine rings are essentially coplanar [dihedral angle = 4.1 (3)°].

Bromidotricarbon-yl[2-(pyridin-2-yl-κN)-5-p-tolyl-1,3,4-oxadiazole-κN]rhenium(I) dichloro-methane monosolvate.

In the title compound, [ReBr(C(14)H(11)N(3)O)(CO)(3)]·CH(2)Cl(2), the coordination geometry of the Re(I) atom is a distorted ReC(3)N(2)Br octa-hedron with the carbonyl C atoms in a fac arrangement. Within the 2-(pyridin-2-yl)-5-p-tolyl-1,3,4-oxadiazole ligand, the dihedral angles between the oxadiazole ring and the pyridine (py) and benzene (bz) rings are 1.7 (2) and 7.

Bromidotricarbon-yl[2-phenyl-5-(pyridin-2-yl-κN)-1,3,4-oxadiazole-κN]rhenium(I) dichloro-methane monosolvate.

In the title rhenium(I) complex, [ReBr(C(13)H(9)N(3)O)(CO)(3)]·CH(2)Cl(2), the dichloro-methane solvent mol-ecule is disordered over two positions with an occupancy ratio of 0.81 (15):0.19 (15).