A PHOSPHORUS-31 NUCLEAR MAGNETIC RESONANCE STUDY OF TERTIARY PHOSPHINE DERIVATIVES OF GROUP VI METAL CARBONYLS. IV. SUBSTITUTED TRIARYLPHOSPHINES

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Abstract
Thirty compounds of the type (ZC6H4)3PM(CO)5 where Z is 3-CH3, 4-CH3, 3-CH3O, 4-CH3O, 3-CF3, 4-CF3, 4-Cl, 4-F, 4-CH3S, or 4-(CH3) C and M is Cr, Mo, or W are reported, in addition to [4-(CH3)3SiC6H4]3 PW(CO)5 and [(2-CH3C6H4)n(C6H5)3–n P] M(CO)5 where n is 1 or 2 and M is Cr, Mo, or W. Phosphorus-31 NMR and infrared data are presented. In general, the compounds containing the more effective electron withdrawing substituents on the tertiary arylphosphines exhibit the larger 31P coordination chemical shifts, the higher carbonyl stretching frequencies, and the larger phosphorus-31-tungsten-183 coupling constants.