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The  2 J (PH) coupling constant of mixtures of (CH 3 ) 3 SiCH 2 CH 2 P(CH 3 ) 2  and BF 3  depends on the ratio of the two components. During the investigation of the simpler system (CH 3 ) 3 P/BF 3 the following results were obtained: 1. τH[P(CH 3 ) 3 ] and  2 J(PH) vary steadily with the ratio (CH 3 ) 3 P/BF 3 , 2. Only one doublet is observed even for mixtures with excess P(CH 3 ) 3 , 3.  2 J (PH) becomes zero for the given ratio BF 3 : P(CH 3 ) 3  = 0.4. The results can be explained by assuming a fast exchange according to equation (2) and opposite signs for the coupling constants of P(CH 3 ) 3  [ 2 J (PH) = +2.5 Hz] and the adduct (CH 3 ) 3 P →BF 3 [ 2 J(PH) = -11.3 Hz].

Kernresonanz-Untersuchung am System (CH 3 ) 3 P/BF 3 / N.M.R. Study of the System (CH 3 ) 3 P/BF 3