Abstract
A new BiCl3-loaded montmorillonite K10 catalyst has been prepared by solid dispersion method and was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and cyclic voltammetry (CV) measurements. BiCl3 loaded K10 (BiCl3-K10) has been used as solid acid catalyst for the synthesis of azine derivatives from benzophenone hydrazone and ketones/aldehydes by simple physical grinding. This BiCl3-K10 gives an excellent yield with short reaction time and is an inexpensive, easily recyclable catalyst for this reaction.
Highlights
Available BiCl3 had been widely used as a Lewis acid catalyst for aldol reaction [1], hetero Diels-Alder reaction [2], ring opening of epoxides with aromatic amines [3], deoxygenative allylation of substituted benzylic alcohols with allyltrimethylsilane [4], and for three-component synthesis of β-amino carbonyl compounds [5]
In continuation of work on the synthesis of azine derivatives with sulfated titania under solvent free conditions [24], we report a recyclable, separable, ecofriendly, and highly effective catalytic system BiCl3 loaded
BiCl3 loaded K10 has been characterized by X-ray diffraction (XRD), SEM, and cyclic voltammetry (CV) measurements
Summary
Available BiCl3 had been widely used as a Lewis acid catalyst for aldol reaction [1], hetero Diels-Alder reaction [2], ring opening of epoxides with aromatic amines [3], deoxygenative allylation of substituted benzylic alcohols with allyltrimethylsilane [4], and for three-component synthesis of β-amino carbonyl compounds [5]. Due to strong catalytic activity as solid acid, Mont K10 clay has been used extensively as a catalyst for many organic transformations [9,10,11,12]. R1R2C=N–N=CR1R2, have attracted great attention in organic synthesis as they are good synthons for obtaining various heterocyclic compounds [13, 14]. These compounds constitute an important class of compounds with unexpected biological activities [15, 16]. In continuation of work on the synthesis of azine derivatives with sulfated titania under solvent free conditions [24], we report a recyclable, separable, ecofriendly, and highly effective catalytic system BiCl3 loaded. To the best of our knowledge this is the first report of azine derivatives in this catalytic way using BiCl3-K10
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