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Rizzoli C.,Parco Area delle Science | Pal R.,Acharya Jagadish Chandra Bose College
Inorganica Chimica Acta | Year: 2014

Copper(II) azido complex [CuL(μ-1,3-N3)] n (1) of a NNO donor tridentate Schiff base (HL = 2-[1-(methylamino-ethylimino)-methyl]-phenol containing single end-to-end μ-1,3-azido bridged 1D infinite chain has been synthesized and characterized by elemental analysis, FT-IR spectroscopy. X-ray single crystal structure analysis reveals that in 1, the central copper(II) ion displays a distorted square pyramidal coordination geometry and are linked by single EE azide bridges forming chains running parallel to the crystallographic b axis. The magnetic interaction revealed that 1 is antiferromagnetic in nature (J = -19.5 (±0.2) cm-1). The catalytic activity of the complex is investigated in a series of solvents for the oxidation of olefins using tert-butyl-hydroperoxide as oxidant. The results showed highest selectivity for 1 in acetonitrile medium.© 2013 Elsevier B.V. All rights reserved.

Pal R.,Acharya Jagadish Chandra Bose College | Sarkar T.,Acharya Jagadish Chandra Bose College | Khasnobis S.,Acharya Jagadish Chandra Bose College
Arkivoc | Year: 2012

Commercially available Amberlyst-15 has played an important role in organic synthesis. This review summarizes the versatile synthetic applications of Amberlyst-15 in different chemical transformations. Reactions include esterification, transesterification, Michael addition, aza-Michael addition, Prins cyclization, Friedel-Crafts alkylation, acylation, metal free hydroarylation, hydroalkylation, halogenation, protection of carbonyls, amines, deprotection of acetals, acetates, Boc-protected amines, cleavage of epoxides, crossed-aldol condensation, synthesis of quinolines, pyrazolines, indolinones, acridines, calix[4]pyrroles, xanthenes, coumarins, benzopyrans theaspirane, furans, and substituted phosphonates. Applications of this catalyst allow mild and highly selective transformations and synthesis in a facile and environmentally friendly manner. The catalysts can be regenerated and recycled. ©ARKAT-USA, Inc.

Pal R.,Acharya Jagadish Chandra Bose College
Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry | Year: 2014

An efficient and greener synthesis of bis-, and tris(indolyl)-methanes and synthesis of di-bis(indolyl)methanes have been accomplished via two-component one pot condensation between substituted aldehydes and indoles using aqueous tamarind fruit juice as a natural catalysts. The use of water as reaction medium makes this process totally nonpolluting having several advantages such as mild reaction conditions, simple work-up procedures and reduces environmental impact.

Iodine-catalyzed reaction of indoles with ,-bis(arylmethylene)cyclopentanones afforded one diastereomer of the corresponding Michael adducts, namely, E-2-(3-indolylphenylmethyl)-5-phenylmethylenecyclopentanones, in a good yield. The products form a new group of indole derivatives.

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