A benzimidazole-based Cu(II) complex catalyzed site-selective C-H sulfenylation of imidazo-[1,2-]pyridines using CS as a sulfur source.

A new benzimidazole-based Cu(II) complex catalyzed site-selective sulfenylation of imidazo[1,2-]pyridines with benzyl/alkyl/allyl bromides and CS at 100 °C in DMF : HO is reported. The present methodology has been developed for the synthesis of 3-sulfenyl imidazo[1,2-]pyridines in good yields with a broad substrate scope. In this protocol, CS, commonly known as a non-polar small molecule bioregulator (SMB), is converted to valuable sulfenylated imidazo[1,2-]pyridine derivatives.

Influence of ortho group in rhodamine B hydrazide based Schiff base for selective recognition of Cu and Fe ions: A mechanistic approach by DFT and colorimetric studies.

Herein we have implemented a computational approach in designing sensor molecules for the selective recognition of Cu and Fe ions. Seven rhodamine B hydrazide-based Schiff base derivatives were designed and analysed their chemosensing properties against Cu and Fe ions in ethanol solution theoretically. The theoretical calculations revealed that the selective recognition of Cu and Fe ions takes place via spirolactam ring-opening and there is a pivotal role of ortho substituents and N-heteroatoms.