Abstract
A new hybrid chiral material, comprising Keggin type mono ruthenium substituted phosphotungstate (PW11Ru) and chiral (R-(-)-1-cyclohexylethylamine (Cy)), was synthesized in an aqueous medium by simple ligand substitution. The bonding was confirmed by FT-IR, multinuclear NMR (31P, 13C and 15N), while the chirality was confirmed by CD spectroscopy and a polarimeter. The study reveals the attachment of Cy and PW11Ru through N → Ru bond. An attempt was made to use the synthesized material as a heterogeneous catalyst for carrying out aerobic asymmetric oxidation of styrene and found that only 0.001 mg (7.9 × 10−6 mmol) of Cy was sufficient to achieve very high TON.
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Acknowledgement
AP is thankful to Science and Engineering Research Board (SERB), Project No. EMR/2016/005718, New Delhi for the financial support.
Disclosure statement
No potential conflict of interest was reported by the authors.