Attempts to develop chiral catalysts for asymmetric reactions of imines must confront the problem that the product is more basic than the starting imine, thus leading to difficulty in turnover.1 A scenario in which both turnover and asymmetric induction could be realized would involve two catalysts, one chiral and one nonchiral (eq 1). If the nonchiral catalyst was in excess, then it could free...

The characterization and catalytic performance of Zn/ZSM-5 Zn-B/ZSM-5 catalysts in the n-hexane aromatization was reported. Catalysts were prepared by post-synthesis ion exchange thoroughly characterized means XRD, Py-FTIR, N2 adsorption, 27Al 11B MAS NMR spectroscopy electron microscopy techniques. incorporation zinc reduces Brønsted acid site density increases Lewis acidic sites final ZSM-5 b...

α-Amino nitriles are synthesized in a one-pot, three-component coupling of aldehydes (or ketones), aniline, and trimethylsilyl cyanide using a catalytic amount of choline chloride.2ZnCl2 as a bio Lewis acidic ionic liquid. Mild Lewis acidic characteristic of this ionic liquid allows efficient synthesis of α-amino nitriles from acid sensitive aldehydes.

an efficient synthesis of 1, 8-dioxo-octahydroxanthens and 1, 8-dioxo-decahydroacridines from the reaction of 5,5-dimethyl-1,3-cyclohexanedione (dimedone) with aromatic aldehydes bearing electron-donating or withdrawing substituents either in the presence or absence of primary amines has been described in a single pot using a catalytic amounts of aluminum tris (dodecyl sulfate) trihydrate [al(d...

in the present work, impact of lewis acid (la) catalysts bf3, bcl3, and bbr3 on the kinetics andregioselectivity of 1,3-dipolar cycloaddition (1,3-dc) reaction between azidobenzene and acroleinwas theoretically studied using b3lyp/6-31g* level. our results indicate while the uncatalyzed 1,3-dc reaction under investigation takes place via a non-polar, non-regioselective, and lowasynchronous proc...

Redox-inactive metal ions can modulate the reactivity of redox-active metal ions in a variety of biological and chemical oxidations. Many synthetic models have been developed to help address the elusive roles of these redox-inactive metal ions. Using a non-heme manganese(II) complex as the model, the influence of redox-inactive metal ions as a Lewis acid on its catalytic efficiency in oxygen at...

A set of Y-type zeolites with Si/Al atomic ratios between 7–45 were studied as catalysts in the aminocyclization reaction acrolein and ammonia to produce pyridine 3-picoline. The catalytic activity tests at 360 °C revealed that conversion increased order Z45 < ZY34 ZY7 ZY17, agreement increase total acidity per gram catalyst. In all cases, bases cracking products (acetaldehyde formaldehyde) ...

One of the most trending topics in catalysis recently is use renewable sources and/or non-waste technologies to generate products with high added value. That why, present review resumes advances catalyst design for biomass chemical valorization. The variety involved reactions and functionality obtained molecules requires multifunctional able increase efficiency selectivity selected process. glu...

Copper catalysts have been extensively investigated for the dehydrogenation of ethanol to acetaldehyde. However, identifying essential active sites this reaction is difficult because complex coordination structure and variable valences Cu species during reaction. The stability in also needs be substantially improved. In study, Cu-MFI, a well-defined Cu-based Lewis acid catalyst, was prepared us...

α-Amino nitriles are synthesized in a one-pot, three-component coupling of aldehydes (or ketones), aniline, and trimethylsilyl cyanide using a catalytic amount of choline chloride.2ZnCl2 as a bio Lewis acidic ionic liquid. Mild Lewis acidic characteristic of this ionic liquid allows efficient synthesis of α-amino nitriles from acid sensitive aldehydes.