Synthesis of Rhodium Complexes with Novel Perfluoroalkyl Substituted Cyclopentadienyl Ligands

0166258 - UCHP-M 20013115 RIV CZ eng J - Journal Article
Čermák, Jan - Auerová, Kateřina - Nguyen, Huong Thi Thu - Blechta, Vratislav - Vojtíšek, P. - Kvíčala, J.
Synthesis of Rhodium Complexes with Novel Perfluoroalkyl Substituted Cyclopentadienyl Ligands.
Collection of Czechoslovak Chemical Communications. Roč. 66, č. 2 (2001), s. 382-396. ISSN 0010-0765
R&D Projects: GA ČR GA203/99/0135; GA MŠMT LB98233
Institutional research plan: CEZ:AV0Z4072921
Keywords : fluorous biphasic catalysis * carbonyl complexes * cyclopentadienes
Subject RIV: CC - Organic Chemistry
Impact factor: 0.778, year: 2001

Mixtures of isomers of (perfluoroalkyl)tetramethylcyclopenta-1,3-dienes (CH3)4C5H(CF2)nCF3 (n = 3, 5, 7, 9) were synthesized as precursors of new cyclopentadienyl ligands for organotransition metal catalysis in fluorous biphase media and characterized by combination of GC/MS and 13C NMR spectroscopy. Rhodium(III) chloro complexes [Rh{(CH3)4C5(CF2)nCF3}Cl2]2 and rhodium(I) carbonyl complexes [Rh{(CH3)4C5(CF2)nCF3}(CO)2] were prepared from the cyclopentadienes and molecular structure of [Rh{(CH3)4C5(CF2)5CF3}Cl2]2 was determined by X-ray diffraction. The ligands are electronically close to the unsubstituted cyclopentadienyl as shown by values of carbonyl stretching frequencies in the carbonyl complexes. Neither carbonyl frequencies nor NMR chemical shifts of the complexes are substantially affected by the length of the perfluoroalkyl chain.
Permanent Link: http://hdl.handle.net/11104/0063389