Girdhar Joshi

Green bromine: in situ generated catalyst for the selective oxidation of alcohols using H2O2 as a benign oxidant

The selective oxidation of benzylic/secondary alcohols to the corresponding aldehydes/ketones with a catalytic amount of bromide–bromate (10 mol%) couple and H2O2 as a benign oxidant has been developed. The oxidation reactions were achieved through acid (15 mol%) activation of 5 : 1 mole ratios of a bromide–bromate couple for the in situ generation of the Br2/BrOH species. The In situ generation of the Br2/BrOH species is also supported by UV-Visible spectrophotometric studies. High selectivity and yields of aldehydes/ketones were obtained without the use of any transition metal catalyst under aqueous conditions.

New Method for the Synthesis of Benzyl Alkyl Ethers Mediated by FeSO4

Abstract The synthesis of benzyl alkyl ethers from benzyl bromides and alcohols using FeSO4 as a recoverable and reusable mediator has been described without use of base and cosolvent under mild conditions.

KHSO4-Catalyzed Synthesis of 1,1′-Oxybis(2-bromoethane-1,1-diyl)dibenzenes and 1-(1-(Benzyloxy)-2-bromoethyl)benzenes Under Solvent-Free Conditions

Abstract An economical and green conversion of 2-bromo-1-phenylethanols and benzylic alcohols into 1,1′-oxybis(2-bromoethane-1,1-diyl)dibenzenes and 1-(1-(benyloxy)-2-bromomethy)benzenes catalyzed by KHSO4 under neat condition is described. The present protocol is facile and chemoselective without transition-metal catalyst/solvent, and the KHSO4 catalyst is recyclable. GRAPHICAL ABSTRACT