titoli, abstracts, parole chiave >>>
Synthesis, characterization, and catalytic activity of Rh(I) complexes with (S)-BINAPO, an axially chiral inducer capable of hemilabile P,O-heterobidentate coordination

Gladiali, Serafino Gabriele and Medici, Serenella and Kégl, Tamás and Kollar, László (2000) Synthesis, characterization, and catalytic activity of Rh(I) complexes with (S)-BINAPO, an axially chiral inducer capable of hemilabile P,O-heterobidentate coordination. Monatshefte für Chemie = Chemical Monthly, Vol. 131 (12), p. 1351-1361. eISSN 1434-4475. Article.

Full text not available from this repository.

DOI: 10.1007/s007060070015

Abstract

The reaction of dinuclear rhodium(I) derivatives of the formula [Rh(DIOL)X]2 with the axially chiral phosphinyl phosphane 2-(diphenylphosphinyl)-2′-(diphenylphosphanyl)-1,1′-binaphthalene ((S)-BINAPO1 1) leads to the formation of cationic complexes [(BINAPO)Rh(DIOL)]+ where the ligand (S)-BINAPO consistently displays a P,O-chelate coordination which is mantained even in solvents of fair polarity. The mononuclear rhodium(I) complexes (S)-2-diphenylphosphanyl-2′-diphenylphosphinyl-1,1′-binaphthalene-(1,5-cyclooctadiene) rhodium tetrafluoroborate (3b) and (S)-2-diphenylphosphanyl-2′-diphenylphosphinyl-1,1′-binaphthalene-(1,4-norbornadiene) rhodium tetrafluoroborate (3c) with 1,5-cyclooctadiene (COD) and 2,5-norbornadiene (NBD) as the diolefin were isolated and characterized. Both show a fluxional behaviour in solution which is due to the mobility of the diolefin rather than to a displacement-recombination of the oxygenated arm of the ligand. The mobility of the 1,4-norbornadiene ligand in 3c is extremely pronounced and the coordinated diolefin flexibility could be frozen only at about 200 K. These complexes are active but poorly stereoselective catalysts for the hydrogenation, hydroboration, and hydroformylation of alkenes.

Item Type:Article
ID Code:5299
Status:Published
Refereed:Yes
Uncontrolled Keywords:Axially chiral auxiliaries, coordination chemistry, hemilabile ligands, homogeneous catalysis, Rhodium complexes
Subjects:Area 03 - Scienze chimiche > CHIM/04 Chimica industriale
Divisions:001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Springer Wien
eISSN:1434-4475
Deposited On:10 Jan 2011 16:49

I documenti depositati in UnissResearch sono protetti dalle leggi che regolano il diritto d'autore

Repository Staff Only: item control page