Chandrakanta Bandyopadhyay

One-pot synthesis of chromeno[2,3-b]isoindolo[1,2-e]pyrrole-12,13-dione derivatives by sequential reaction of ninhydrin, 2-aminochromen-4-ones and arylamines

ABSTRACT Stirring an equimolar mixture of ninhydrin 1 and 2-aminochromen-4-ones 2 in CH3COOH at room temperature produced 6a,11a-dihydroxy-6H-chromeno[2,3-b]indeno[2,1-d]pyrrole-11,12(6aH,11aH)-diones 3, which on heating with aromatic amines 6 in acetic acid produced 11b-hydroxy-7-N-arylimino-6H-chromeno[2,3-b]isoindolo[1,2-e]pyrrole-12,13(11bH)-diones 7. GRAPHICAL ABSTRACT

Chemoselective Reduction of Some Condensates derived from Chromone-3-carbaldehyde using Sm and Zn

Abstract Condensates 4–6 undergo reductive dimerization with Sm in THF containing aqueous NH4Cl to produce 7–9, whereas with Zn under similar reaction condition 3–5 produce 10–12.

Chromenone-rhodamine conjugate for naked eye detection of Al3+ and Hg2+ ions in semi aqueous medium

ABSTRACT Chromenone-rhodamine conjugate 1 has been synthesized and its metal ion binding properties have been studied in CH3CN/water (3:1, v/v; 10 mM HEPES buffer; pH = 6.85). Compound 1 senses multiple metal ions such as Al3+ and Hg2+ by exhibiting turn on fluorescence and color change (colorless to pink). Al3+ and Hg2+ ions have been distinguished with the aid of tetrabutylammonium iodide (TBAI). While in the presence of I− the pink color of the 1.Hg2+ complex was completely discharged; under identical conditions the pink color of 1.Al3+ complex was retained. GRAPHICAL ABSTRACT

Design and synthesis of dichromeno[2,3-b;3′,2′-e]pyridine-12,14-dione to evaluate its optical properties

An unambiguous synthesis of dichromeno[2,3-b;3′,2′-e]pyridine-12,14-diones has been developed under mild conditions and their optical properties have been evaluated by studying UV-vis absorption and photoluminescence (PL) spectroscopy, cyclic voltammetry (CV) measurements, DFT calculations and thermogravimetric analysis.