A mixed halo / n-alkyl compound of chromium(III): synthesis, structure, and reactivity of Cr(n-Bu)2Cl[(Me2PCH2)3CMe]

• Published in: Journal of organometallic chemistry Vol. 376; no. 2-3; pp. 343 - 351
• Main Authors: Thaler, Eric G., Folting, Kirsten, Huffman, John C., Caulton, Kenneth G.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 07.11.1989; Elsevier Science
• Subjects: Chemistry; Condensed matter: structure, mechanical and thermal properties; Exact sciences and technology; Organic chemistry; Organic compounds; Organometalloidal and organometallic compounds; Physics; Preparations and properties; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Transition metals derivatives
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/0022-328X(89)85144-7

Cr(n-Bu)2Cl[(Me2PCH2)3CMe] has been synthesized, characterized, and subjected to a single-crystal X-ray structure determination of its toluene solvate. Space group Pcnb with (− 158°C) a 18.696(7) Å, b 15.055(5), c 21.697(7), Z = 8 and R(F) = 0.0805. There is no evidence for agostic C-H-Cr interactions in the structure, but the alkyl groups cause a marked lengthening of Cr-P bonds in comparison to chlorine as the group trans to P. 1H NMR spectra of the analogous methyl, ethyl, propyl and butyl compounds reveal that only the γ and δ hydrogens of the alkyl substituent give detectable signals, while all hydrogens on the tripod ligand are observed.