-Interaction of the pyrrolizine 3 with cyanogen bromide in a tetrahydrofuran/water mixture affords addition to the enamine double bond with formation of 5 which can be aromatized to 6 by silica gel. Reaction of 6 with cyanogen bromide in the same solvent mixture yields the indoline 8a which structure is proved in a chemic/d way by conversion of the product into the aldehyde 8(1. The different r...

The pentacoordinate complex ZnS4(PMDETA) (1) is formed by treatment of ZnS6(TMEDA) (2) with the tridentate ligand pentamethyldiethylenetriamine (PMDETA). 1H NMR studies show that samples of 1 react with elemental sulfur to produce a significant (<30%) amount of a second polysulfido complex, assigned as ZnS5(PMDETA). Crystallographic studies reveal that 1 has a ZnN3S2 coordination sphere with a ...