Butyl fluoro phosphines and Their Transition Metal Complexes

/er/-BUTYL FLUORO PHOSPHINES AND THEIR TRANSITION METAL COMPLEXES [cis-[Bis-(tert-butyldifluorophosphine)tetracarbonylniolybdenuin(O)] and /ra s-Dibromobis(di- er -butylfIuorophosphine)Nickel(II)] 

Submitted by O. STELZER and R. SCHMUTZLER Checked by PATRICIA BLUM and DEVON W. MEERt 

Alkyl and aryl fluorophosphines, R PF3. (R = hydrocarbon group n = 1,2) are known to undergo spontaneous redox disproportionation in accord with 

This facile disproportionation makes the study of the coordination chemistry of these valuable ligands difficult. Although fluorodimethylphosphine and difluoromethylphosphine are known to undergo disproportionation with ease, the presence of electronegative substituents on trivalent phosphorus is known to decrease the rate of disproportionation. A similar, even more pronounced, effect has been observed upon introduction of the bulky fert-butyl group as a substituent, and both tert-butyldifluorophosphine and di-tert-butylfluorophos- 

The synthesis of the fluoro phosphines is accomplished using chlorine-fluorine exchange in the corresponding chloro phosphines with sodium fluoride in sulfolane (tetrahydrothiophene 1,1-dioxide). The preparation of representative fluoro phosphine complexes with both a zero-valent and bivalent transition metal, Mo(0) and Ni(II), respectively, is also described. 

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