Transition metal complexes of a constrained phosphite ester. V. Metal carbonyl complexes of 2,8,9-trioxa-1-phosphaadamantane

Article abstract of DOI:10.1021/ic50038a030

The preparation and characterization of metal carbonyl complexes of 2,8,9-trioxa-1-phosphaadamantane, P(OCH)₃(CH₂)₃, are described. Substitution products obtained from Ni(CO)₄ include compounds of the type Ni(CO)_4-x[P(OCH)₃(CH₂)₃]_x where x = 1, 2, 3, or 4. Synthesis of the mono- and disubstituted complexes of Fe(CO)₅, Cr(CO)₆, Mo(CO)₆, and W(CO)₆ with P(OCH)₃(CH₂)₃ is also reported. A study of the carbonyl infrared stretching frequencies implies that P(OCH)₃(CH₂)₃ is equal to other phosphites in π-bonding ability. The proton nmr spectra of the compounds are discussed with special attention given to the disubstituted complexes. The proton nmr spectra of analogous disubstituted complexes of P(OCH₂)₃CCH₃ discussed previously by us (see ref 5) are more rigorously treated.