Mild and Regioselective Oxidative Bromination of Aromatic Compounds Using Ammonium Bromide and Oxone®

The selective mono-bromination of various activated aromatic compounds is reported using in situ generated bromine from NH4Br as a bromine source and oxone® as an oxidant for the first time.

Crystalline and amorphous aluminosilicates with different pore structures for the synthesis of pyridines

The heterogeneous catalytic synthesis of pyridine and methylpyridines (picolines) was carried out by the reaction of ethanol with formaldehyde and ammonia over aluminosilicates with different acidic properties and textural characteristics: zeolite framework-type FAU in H-form with microporous (H-Y) and micro-meso-macroporous structure (H-Y-mmm) and mesoporous aluminosilicates, obtained by sol-gel synthesis in an alkaline medium (ASM-1) and under variable pH (ASM-2). It is shown that the highest catalytic activity is characteristic of ASM-2 (Si/Al = 40) with a narrow pore size distribution within the range 2 to 5 nm and containing strongly acidic bridging Si–OH–Al groups on the surface. The products of the reaction of ethanol with formaldehyde and ammonia on the catalysts studied are dominated by picolines; the maximum amount of picolines (60%) is formed on the H-Y-mmm and aluminosilicate ASM-2 samples.

A new and versatile one-pot strategy to synthesize alpha-bromoketones from secondary alcohols using ammonium bromide and oxone

A new, efficient and green protocol for the one-pot synthesis of alpha-bromoketones from secondary alcohols is reported.

Template-free synthesis of high degree crystallinity zeolite Y with micro–meso–macroporous structure

Template-free synthesis of zeolite Y with hierarchical porous structure.

One-pot synthesis of α-iodoketones from alcohols using ammonium iodide and Oxone® in water

A novel and green protocol for the synthesis of α-iodoketones from various secondary alcohols in aqueous media is reported.

The vicinal functionalization of olefins: a facile route to the direct synthesis of β-chlorohydrins and β-chloroethers

A general and green approach for the highly regio- and stereoselective synthesis of α-hydroxy-β-chloro and α-methoxy-β-chloro derivatives from olefins using inexpensive and industrially acceptable reagents is reported.

Synthetic derivatives of abietic acid with radical scavenging activity

In this work, studies on the arylation of anilines derived from dehydroabietic acid, the main component of disproportionated rosin, are presented. The redox properties of the new diarylamines were investigated by cyclic voltammetry, and their free radical scavenging activity was tested by reduction of the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical. Three of the diarylamines with lower oxidation potential proved to be as active as isopropyldiphenylamine (IPPD) and superior to tert-butylhydroxytoluene (BHT), both commercially available synthetic antioxidants.