(Tellurolato)chromium complexes. Syntheses and crystal structures of CpCr(CO)3(TePh), [CpCr(CO)2(TePh)]2, and [CpCr(TePh)]2Te

Article abstract of DOI:10.1021/om00017a044

The predominant product isolated from the reaction of [CpCr(CO)₃]₂ (1; Cp = η⁵-C₅H₅) with 1 molar equiv of Ph₂Te₂ varies with reaction conditions as follows: CpCr(CO)₃(TePh) (2; 67% yield, from an instantaneous reaction at ambient temperature), [CpCr(CO)₂(TePh)]₂ (3; 80% yield, after 4.5 h at 60°C), and [CpCr(TePh)]₂Te (4; 70% yield, after 4 h at 80°C). Thermolysis studies showed an interconversion between 2 and 3, accompanied by slow total decarbonylation to 4. An NMR-tube reaction of [CpCr(CO)₂]₂ with Ph₂Te₂ at 70°C for 2 h resulted in the formation of 2 (58%), 3 (4%), and 4 (34%). The complexes, 2-4 have been elementally, spectrally, and structurally characterized. Crystal data: 2, monoclinic, space group P2₁/c, a = 10.8250(8) A?, b = 8.6891(6) A?, c = 15.5263(7) A?, β = 98.880(5)°, V = 1442.9(2) A?³, Z = 4; 3, triclinic, space group P1, a = 10.0493(8) A?, b = 11.0612(6) A?, c = 13.263(1) A?, α = 102.021(6)°, β = 93.791(7)°, γ = 105.652(5)°, V = 1376.7(2) A?³, Z = 2; 4, monoclinic, space group P2₁/n, a = 10.1595(7) A?, b = 21.505(1) A?, c = 10.615(1) A?, β = 95.607(8)°, V = 2308.1(5) A?³, Z = 4.