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

Article abstract of DOI:10.1016/0022-328X(89)85144-7

Cr(n-Bu)2Cl<(Me2PCH2)3CMe> has been synthesized, characterized, and subjected to a single-crystal structure determination of its toluene solvate.Space group Pcnb with (-158 deg C) a 18.696(7) angstroem, 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.