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Titolo:
CHIRAL ANNULATED CYCLOPENTADIENYL LIGANDS - SYNTHESIS AND CRYSTAL-STRUCTURE OF BOTH EXO AND ENDO RH(ETA(5)-CP')(COD)) [CP' = RIMETHYL-1H,4,5,6,7-TETRAHYDRO-4,7-METHANOINDENYL]
Autore:
RAMSDEN JA; MILNER DJ; ADAMS H; BAILEY NA; HEMPSTEAD PD; WHITE C;
Indirizzi:
UNIV SHEFFIELD,DEPT CHEM SHEFFIELD S3 7HF S YORKSHIRE ENGLAND UNIV SHEFFIELD,DEPT CHEM SHEFFIELD S3 7HF S YORKSHIRE ENGLAND
Titolo Testata:
Journal of organometallic chemistry
fascicolo: 1-2, volume: 551, anno: 1998,
pagine: 355 - 366
SICI:
0022-328X(1998)551:1-2<355:CACL-S>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
OLEFIN POLYMERIZATION; TETRAPHENYLCYCLOPENTADIENYL COMPLEXES; ASYMMETRIC HYDROGENATION; METALLOCENE CATALYSTS; TITANOCENE;
Keywords:
CHIRAL ANNULATED CYCLOPENTADIENYL; RHODIUM COMPLEXES; FUSED CAMPHOR DERIVATIVES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
J.A. Ramsden et al., "CHIRAL ANNULATED CYCLOPENTADIENYL LIGANDS - SYNTHESIS AND CRYSTAL-STRUCTURE OF BOTH EXO AND ENDO RH(ETA(5)-CP')(COD)) [CP' = RIMETHYL-1H,4,5,6,7-TETRAHYDRO-4,7-METHANOINDENYL]", Journal of organometallic chemistry, 551(1-2), 1998, pp. 355-366

Abstract

The title homochiral cyclopentadiene ligand C31H30 (i.e., Cp'H, 5) has been synthesised from camphor in four steps. The lithium salt of this ligand reacted with [Rh(cod)Cl](2) to give predominantly racemic iene)[eta(5)-1,2,3-triphenyl-4-methyl-7-isopropyl- 1H-indenyl]rhodium although the desired RhCp'(cod) complex was formed in 20% yield as an equal mixture of endo 7a and exo 7b isomers. The X-ray structures of 7a and 7b have been determined at room temperature with use of Mo-K-alpha radiation (lambda = 0.71069 Angstrom). Both compounds crystallise in the orthorhombic space group P2(1)2(1)2(1) (D-2(4), No. 19); for compound 7a, a = 13.549(23) Angstrom, b = 14.490(25) Angstrom, c = 15.909(14) Angstrom, V = 3123(8) Angstrom(3), Z = 4 and D-c = 1.303 g cm(-3) and the structure was refined to R = 0.0488 on the basis of 2545 independent reflections. For the exo isomer 7b, a = 13.301(18) Angstrom, b = 15.599(32) Angstrom, c = 14.436(19) Angstrom, V = 2995(10) Angstrom(3), Z = 4 and D-c = 1.359 g cm(-3); the structure was refined to R = 0.0362 on the basis of 4620 independent reflections. Bromine reacts with the compounds 7a and 7b to give the corresponding [{Rh(Cp')}(2)(mu-Br-3)]Br-3. (C) 1998 Elsevier Science S.A.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 18:30:01