Amidation of aldehydes using mono-cationic half-sandwich rhodium(III) complexes with functionalized phenylhydrazone ligands
Author(s)
Devika, Neelakandan
Anna University - Regional Office Tiruchirappalli
Ananthalakshmi, Subbiah
Raja, Nandhagopal
Anna University
Gajendra Gupta
Date issued
February 21, 2019
In
Journal of Organometallic Chemistry
No
886
From page
65
To page
70
Reviewed by peer
1
Subjects
Phenylhydrazone-based ligands Half-sandwich complexes Homogenous catalysis Pentamethylcyclopentadienyl rhodium complexes Amidation reaction
Abstract
A series of mono-cationic half-sandwich rhodium(III) complexes have been synthesized in methanol using phenylhydrazone-derived ligands (L1eL6) and the starting precursor [(h5-C5Me5)2Rh2(m-Cl)2Cl2]in a 2:1 molar ratio. The N,N0-phenylhydrazone complexes have been isolated as tetraphenylborate salts. All complexes were characterized by elemental analysis, FT-IR, UVevisible, NMR spectroscopy and mass spectrometry. The molecular structure of complex [(h5-C5Me5)Rh(L1)Cl](BPh4) (1) was confirmed by single-crystal X-ray structure analysis. Complex [(h5-C5Me5)Rh(L3)Cl](BPh4)(3) was used as an efficient catalyst for the amide formation reaction, with up to 99% conversion after 2h in toluene at 110 C in the presence of hydroxyl amine hydrochloride and sodium bicarbonate.
Publication type
journal article
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