Substituted metal carbonyls
Autor: | Pauline M. N. Low, T. S. Andy Hor, Yaw Kai Yan, Yuh-Sheng Wen, Ling-Kang Liu |
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Rok vydání: | 1993 |
Předmět: |
Diphenylphosphine
Stereochemistry Organic Chemistry Substituent Metal carbonyl Crystal structure Nuclear magnetic resonance spectroscopy Biochemistry Medicinal chemistry Inorganic Chemistry chemistry.chemical_compound chemistry Nucleophile Materials Chemistry Chlorodiphenylphosphine Physical and Theoretical Chemistry Phosphine |
Zdroj: | Journal of Organometallic Chemistry. 448:131-137 |
ISSN: | 0022-328X |
DOI: | 10.1016/0022-328x(93)80077-o |
Popis: | Oxidation of [Re(CO) 5 ] − by a molar equivalent of PPh 2 Cl at ca. −70°C yielded three dinuclear complexes, Re 2 (μ-Cl)(μ-PPh 2 )(CO) 8 ( 1 ), Re 2 (CO) 9 (PPh 2 H) ( 2 ) and Re 2 (μ-H)(μ-PPh 2 )(CO) 8 ( 3 ), as major products. When PPh 2 Cl was present in two-fold excess, only 2 and ReCl(CO) 4 (PPh 2 H) ( 4 ) were isolated. All the complexes were characterized by IR and NMR ( 1 H and 31 P) spectroscopy. The crystal structures of 2 and 4 were determined by single-crystal X-ray diffraction analyses. Crystal data: ReCl(CO) 4 (PPh 2 H), space group P 2 1 / c , a = 11.358(1), b = 10.365(1), c = 14.765(3) A, β = 96.07(1)°, final R = 0.022 for 1891 observations; Re 2 (CO) 9 (PPh 2 H), space group P 2 1 / a , a = 12.709(1), b = 12.072(2), c = 15.462(2) A, β = 92.14(1), final R = 0.029 for 2093 observations. Complex 2 is the first structurally characterized Re 2 (CO) 9 (PR 3 ) complex with the phosphine substituent at the equatorial site. The complex Re 2 (η-PPh 2 ) 2 (CO) 8 was not detected and there is no evidence of direct nucleophilic attack of the rhenate on chlorodiphenylphosphine. |
Databáze: | OpenAIRE |
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