Abstract
(1,4-Di-tert-butylbenzene)Cr(CO)2PPh3 exhibits restricted arene-Cr bond rotation in solution (DELTAG(double dagger)203 = 31.6 kJ mol-1). A series of (arene)Cr(CO)2P(o-tolyl)3 complexes have been prepared which exhibit restricted P-C rotation in solution; in cases where planar chirality is present, diastereoisomers may be observed which differ in the helicity of the exo2 phosphine conformation. Diastereoisomer interconversion and o-tolyl ring exchange occur with very similar activation energies. Crystal structure data: (1,4-di-tert-butylbenzene)Cr(CO)2PPh3, monoclinic, space group P2(1) n, a = 10.137(1) angstrom, b = 13.992(2) angstrom, c = 20.882(3) angstrom, beta = 96.16(2)-degrees, Z = 4, R(w) = 9.18% for 345 refined parameters and 3643 observed reflections; (p-xylene)Cr(CO)2P(o-tolyl)3, monoclinic, space group P2(1) n, a = 8.552(1) angstrom, b = 17.410(2) angstrom, c = 17.558(2) angstrom, beta = 91.95(2)-degrees, Z = 4, R(w) = 9.96% for 317 defined parameters and 3392 observed reflections; (benzene)Cr-(CO)2P(M-tolyl)3, monoclinic, space group P2(1) n, a = 11.120(3) angstrom, b = 11.227(1) angstrom, c = 20.289(4) angstrom, beta = 100.63(2)-degrees, Z = 4, R(w) = 6.49% for 299 defined parameters and 3127 observed reflections.
| Original language | English (Ireland) |
|---|---|
| Pages (from-to) | 1694-1701 |
| Number of pages | 8 |
| Journal | Organometallics |
| Volume | 12 |
| Issue number | 5 |
| Publication status | Published - 1 May 1993 |
Authors (Note for portal: view the doc link for the full list of authors)
- Authors
- HOWELL, JAS,PALIN, MG,MCARDLE, P,CUNNINGHAM, D,GOLDSCHMIDT, Z,GOTTLIEB, HE,HEZRONILANGERMAN, D