Very often ligands are anionic or neutral species. Cationic ones are rare, and, when used, the positively charged groups are normally appended to the periphery of the ligand. Here, we describe a dicationic phosphine with no spacer between the phosphorus atom and the two positively charged groups. This structural feature makes its donor ability poorer than that of phosphites and only comparable to extremely
Abstract The structure of 3′- O -methylbatatasin III, a new bibenzyl of the East Himalayan orchid, Coelogyne ovalis , has been established on the basis of spectral and chemical data. Known 9,10-dihydrophenanthrene derivatives, a bibenzyl and sterols have also been isolated from the orchid.
摘要 基于光谱和化学数据,确定了东喜马拉雅兰花 Coelogyne Ovalis 的新联苄基 3'-O-methylbatatasin III 的结构。已知的 9,10-二氢菲衍生物、联苄和甾醇也已从兰花中分离出来。