Crystal Structures of Diphosphinated Chromium Fischer Amino Carbenes |
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| Authors: | Eric W. Reinheimer Katherine A. Kantardjieff Xiang Ouyang Steven R. Herron Tiffany Lu Joe A. Casalnuovo |
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| Affiliation: | (1) Department of Chemistry, California State Polytechnic University, 3801 West Temple Avenue, Pomona, CA 91768, USA;(2) W.M. Keck Foundation Center for Molecular Structure, California State University, 800 N. State College Blvd, Fullerton, CA 92834, USA;(3) Department of Chemistry, Texas A&M University, College Station, TX 77842, USA;(4) Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA |
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| Abstract: | The crystal structures of four new diphosphinated chromium Fischer amino carbenes with the compositions fac-[(P-P)(CO)3Cr=C(NR2′)(R)] (R = Me, NR2′ = pyrrolidino, P-P = dppe, 1; R = Me, NR2′ = pyrrolidino, P-P = dppp, 2; R = Me, R′ = Me, P-P = dppe, 3; R = Me, R′ = Me, P-P = dppp, 4) have been determined at 243 K. Compound 1 crystallizes in the monoclinic system, space group P21 /n with a = 12.1597(11) Å, b = 20.1556(17) Å, c = 14.0557(12) Å, β = 114.163(3)°, V = 3143.0(5) Å3, and Z = 4. Compound 2 crystallizes in the triclinic system, space group P ? 1 with a = 7.4424(3) Å, b = 10.8830(5) Å, c = 20.6040(9) Å, α = 100.9880(10)°, β = 91.7650(10)°, γ = 97.6610(10)°, V = 1620.90(12) Å3, and Z = 2. Compound 3 crystallizes in the monoclinic system as a mono-solvate of d5-pyridine, space group P21 /c with a = 11.485(2) Å, b = 22.825(5) Å, c = 14.092(3) Å, β = 108.53(3)°, V = 3502.7(12) Å3, and Z = 4. Compound 4 crystallizes in the orthorhombic system, space group P2 1 2 1 2 1 with a = 8.359(3) Å, b = 15.364(6) Å, c = 23.784(9) Å, V = 3055(2) Å3, and Z = 4. Steric repulsions with the diphosphine ligand favor a conformation with the amino moiety directed away from the diphosphine backbone in 1–4. |
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| Keywords: | Fischer carbenes Diphosphine X-ray structure dppe dppp Conformation |
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