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Crystals of the title compound, C 30 H 20 F 12 P 2  or  R2 PCH 2 CH 2 P R2  ( R  = 4-C 6 H 4 CF 3 ), were inadvertently prepared while attempting to recrystallize a crude sample of  trans -Re(Cl)(N 2 )( R2 PCH 2 CH 2 P R2 ) 2  from diethyl ether. The molecule lies on a center of inversion. One of the rings lies approximately in the P—C—C—P plane; the dihedral angle is 174.53°.The other ring is not quite perpendicular; the dihedral angle is 71.1°. The compound is isostructural with the  R  = Ph, 4-C 6 H 4 CH 3  and 4-C 6 H 4 CH 2 CH 3  analogues. It is well known that the basicity of phosphines and diphosphines can be altered by changing the electron-donating ability of  R ; however, the structural parameters for the title compound do not significantly differ from those of the aforementioned substituted-phenyl compounds.

1,2-Bis{bis[4-(trifluoromethyl)phenyl]phosphino}ethane