Abstract
Abstract Geometrical isomers of λ3-diazadiphosphetidines show large differences in their 31P chemical shifts. Trifluoroethoxylation of cis-(PhNPCl)2 gives only the 'low-field' isomer initially, for which the crystal structure is determined. The compound crystallises in the triclinic space group P1̄ with a = 9 .6 2 4 (4 ).6 = 10.107(4),c = 11.140(7) Å ; a = 105.65(4),β = 110.59(4),y = 93.82(3)°;and Z = 2. The structure was solved by direct methods and refined to R = 0.045. The alkoxy groups are trans to each other. On standing in solution. trans -[PhNP(OCH2CF3)]2 transforms slowly and almost completely into its cis analogue with a high field 31P chemical shift
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