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Amphoteric ligands. 3. Reactions of alkylmetal carbonyls with (aluminoamino)phosphine ligands. Structure of (η-C5H5)(CO)Fe(C(CH3)OAl(C 2H5)2N(C(CH3)3)P(C 6H5)2)
Labinger, Jay A.,Bonfiglio, John N.,Grimmett, David L.,Masuo, Steven T.,Shearin, Eileen,Miller, Joel S.
, p. 733 - 740 (2008/10/08)
Amphoteric ligands Ph2PNRAlR′2 react with alkylmetal carbonyl complexes to induce facile migrations. The reaction of Ph2PN-t-BuAlEt2 with CpFe(CO)2Me (Cp = η5-C5H5) gives as major product the chelated acyl complex Cp(CO)Fe(C(Me)OAlEt2N-t-BuPPh2), along with smaller amounts of Cp(CO)Fe(O-(CH=CH2)AlEt2N-t-BuPPh2). An intermediate leading to these products was characterized crystallographically as Cp(CO)Fe(C(Me)OAlEt2N-t-BuPPh2). Crystal data: triclinic; space group P1; a = 10.474 (2) A?, b = 15.677 (3) A?, c = 9.707 (1) A?; α = 97.98 (1)°, β = 115.01 (1)°, γ = 71.81 (1)°; Z = 2; final R = 0.049 for 4303 reflections used. The molecule consists of a five-membered heterocycle, C(Me)OAl-(Et)2N(t-Bu)P(Ph)2, bonded in η2(C, O) fashion to a Cp(CO)Fe fragment, with Fe-C = 1.983 (3) A?, Fe-O = 1.969 (2) A?, and C-O = 1.401 (3) A?.
