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Abstract
The plot of the potential energy of a phosphin as a function of the s-character of the lone-pair at the phosphorus displays that in alkyl- and arylphosphines small changes of the energy can cause considerable changes of the bond angles. A measure for these changes is the coupling constant 1J(31P-13C). The drastic changes of the coupling constants and therefore the changes of the bond angles at the phosphorus atom are due to the steric interactions of both, the neighbouring substituents in the 1,3-oxaphosphorinanes and the substituents in endo-2,8-position in the 1-phospha-3,7-dioxabicyclo-[3,3,1] nonanes.