Journal
JOURNAL OF COORDINATION CHEMISTRY
Volume 65, Issue 5, Pages 911-922Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2012.664639
Keywords
Chiral N,O-chelate Schiff bases; Rh(eta(4)-cod)(chiral N,O-chelate) complexes; Enantiopurity; Catalysis
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Funding
- Jahangirnagar University, Dhaka, Bangladesh [2008/09]
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Condensation of salicyldehyde with (R or S)-2-amino-2-phenylethanol or rac-2-amino-1-phenylethanol gives enantiopure (R or S)-2-(salicylaldimine)-2-phenylethanol (R-or S-H(2)L1) or (rac)-2-(salicylaldimine)-1-phenylethanol (rac-H2L2). The Schiff bases coordinate to [Rh(eta(4)-cod)(mu-O2CCH3)](2) to afford mononuclear [Rh(mu(4)-cod){(R or S)-2-(salicylaldiminato)-2-phenylethanol-kappa(2) N,O}], [Rh(eta(4)-cod)(R-or S-HL1)] (1 or 2), or [Rh(eta(4)-cod){(rac)-2-(salicylaldiminato)-1-phenylethanol-kappa(2) N,O}], [Rh(eta(4)-cod)(rac-HL2)] (3). The Schiff base and complexes are characterized by IR-, UV/Vis-, H-1/C-13-NMR-, mass-spectroscopy, circular dichroism (CD), and polarimetry. The synthetic and spectroscopic results suggest that deprotonated Schiff base coordinates to [Rh(eta(4) -cod)] as a six-membered N,O-chelate with distorted square planar geometry at rhodium. CD and polarimetry measurements show the enantiopurity of the Schiff bases as well as the complexes in solution. The in situ system composed of [Rh(eta(4)-cod)Cl](2) and S-H(2)L1 has been used as a catalyst for the reduction of acetophenone into rac-1-phenylethanol with 85% conversion in diphenylsilane at 0-5 degrees C.
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