| Abstract: | Contributions to the Chemistry of Phosphorus. 219. Tetraisopropyloctadecaphosphane(4), P18i-Pr4 — Preparation and Structure Determination by Nuclear Magnetic Resonance Tetraisopropyloctadecaphosphane(4) ( 1 ) has been obtained by reaction of i-PrPCl2 with P4 and magnesium and subsequent thermolysis of the crude reaction product, and has been isolated in 95% purity. According to NMR-spectroscopic investigations, 1 contains a conjuncto-phosphane skeleton consisting of a P11(5)- and a P9(3)-structural element analogous to that of deltacyclane, joined through a common P2-bridge. Thus, 1 is 8,14,16, 18-tetraisopropyloctacyclo13.2.1.02,13.03,11.04,9.05,7.06,10.012,17]octadecaphosphane. Compound 1 is formed as a mixture of two configurational isomers 1 a and 1 b , which differ from each other in their spatial arrangements of the isopropyl group at P8. |
