REACTIONS OF ALLYLDICHLOROPHOSPHITE AND A LLYLDIFLUOROPHOSPHITE WITH SOME TRANSITION-METAL COMPOUNDS - SYNTHESIS AND SPECTROSCOPIC IDENTIFICATION OF ALLYLDICHLOROPHOSPHITE-CARBONYL-METAL(0) AND ALLYLDIFLUOROPHOSPHITE-CARBONYL-METAL(0) COORDINATION-COMPOUNDS (METAL EQUALS CR, MO,W, FE)

In the reactions of allyldifluorophosphite (1) and allyldichlorophosph ite (2) with the carbonyl compounds (C7H8)M(CO)(3) (M = Cr, MO; C7H8 = cycloheptatriene), W(CO)(5)THF (THF = tetrahydrofuran), Fe(CO)(5) or Fe-2(CO)(9) the allyldichloro- and allyldifluorophosphite-carbonyl-met al compounds fac-(AllOPF(2))(3)Cr(CO)(3) 3 a, mer-(AllOPF(2))(3) Cr(CO )(3) 3 b, fac-(AllOPF(2))(3)Mo(CO)(3) 4, fac-(AllOPCl(2))(3)Mo(CO)(3) 5, (AllOPF(2))W(CO)(5) 6, (AllOPCl(2))W(CO)(5) 7, (AllOPF(2))Fe(CO)(4) 8 and (AllOPCl(2))Fe(CO)(4) 9 were formed (All = CH2=CHCH2). In 8 and 9 the ligands 1 or 2 are axially orientated. The validity of the conc ept of hard and soft acids and bases (HSAB-concept) and of the 18-vale ncy electron rule (18-VE-rule) was confirmed. The allyl dihalophosphit es 1 and 2 coordinate via phosphorus. The allylic pi-system was not in volved in the coordinative bond. The characterization of the coordinat ion compounds 3, 4, 5a, 5b und 6-9 was based on their IR and NMR spect ra, and on the mass spectra.