NDLI: Design and synthesis of ruthenium(II) OCO pincer type NHC complexes and their catalytic role towards the synthesis of amides

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Design and synthesis of ruthenium(II) OCO pincer type NHC complexes and their catalytic role towards the synthesis of amides

Content Provider	Springer Nature Link
Author	NIRMALA, MUTHUKUMARAN VISWANATHAMURTHI, PERIASAMY
Copyright Year	2015
Abstract	The present contribution describes the synthesis and characterization of a family of robust ruthenium complexes, supported by a tridentate pincer ligand of the type bis-phenolate-N-heterocyclic carbene [ $^{ tBu}$(OCO) $^{2−}$] (NHC). Ruthenium(II) complexes (1-3) bearing bis-phenolate-N-heterocyclic carbene ligand were synthesized in good yields by the reaction of imidazolinium proligand (HL) with metal precursors [RuHCl(CO)(EPh$_{3}$)$_{2}$(B)] (E = P or As; B = PPh$_{3}$, AsPh$_{3}$ or Py) by transmetalation from the corresponding silver carbene complex. All the Ru(II)-NHC complexes have been characterized by elemental analyses, spectroscopic methods as well as ESI mass spectrometry. Based on the spectral results, an octahedral geometry was assigned for all the complexes. The tridentate nature of the $^{ tBu}$(OCO) $^{2−}$ ligand as well as some level of steric protection provided by the $^{ t }$Bu groups may rationalize the excellent stability of the Ru-C$_{carbene}$ bond in the present systems. Moreover, for the explorations of catalytic potential of the synthesized compounds, all the three [Ru-NHC] complexes (1-3) were tested as catalysts for amidation of alcohols with amines. Notably, the complex 1 was found to be very efficient and versatile catalyst towards amidation of a wide range of alcohols with amines. Graphical Abstract Three new air-stable Ruthenium(II) complexes bearing bis-phenolate-N-heterocyclic carbene ligand were synthesized and characterized by FT-IR, NMR and ESI-Mass. The catalytic study of these complexes towards amidation of alcohol with amines was conducted. This new protocol is effective for many electronically diverse alcohols and amines, providing corresponding amide derivatives in good to excellent yields.
Starting Page	9
Ending Page	21
Page Count	13
File Format	PDF
ISSN	09743626
Journal	Journal of Chemical Sciences
Volume Number	128
Issue Number	1
e-ISSN	09737103
Language	English
Publisher	Springer India
Publisher Date	2015-12-28
Publisher Institution	Indian Academy of Sciences
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bis-phenolate-N-heterocyclic carbene ligand [Ru-NHC] complexes transmetalation amidation Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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