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Title: SiO2-H3PO4 catalyzed condensation of amines and aldehydes: Solvent-free synthesis of some E-imines, spectral correlations of (E)-N-(substituted benzylidene)-1-benzylpiperidin-4-amines and XRD structure of (E)-N-(4-nitrobenzylidene)-1-benzylpiperidin-4-amine
Authors: Mayavel, P
Thirumurthy, K
Dineshkumar, S
Thirunarayanan, G
Keywords: (E)-Imines;SiO2-H3PO4;Hammett correlations;X-ray crystal structure
Issue Date: Jun-2015
Publisher: NISCAIR-CSIR, India
Abstract: A series of Schiff bases (aryl E-imines) including (E)-N-(substituted benzylidene)-1-benzylpiperidin-4-amines have been derived from the SiO2-H3PO4 catalyzed solvent-free condensation of aryl amines including 1-benzylpiperidin amines and substituted benzaldehydes under microwave irradiation. The yields of the imines are more than 85%. The synthesized imines are characterized by their physical constants, analytical and spectroscopic data earlier reported in literature. The group frequencies of imines such as infrared (v, cm-1), NMR both 1H and 13C chemical shifts (, ppm) have been correlated with Hammett substituent constants, F and R parameters. The XRD structure of the (E)-N-(4-nitrobenzylidene)-1-benzylpiperidin-4-amine have been established.
Page(s): 779-790
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.54B(06) [June 2015]

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