139449-30-2

Upstream product

• 139449-23-3 3-(benzenesulfonyl)chroman-4-one 
• 106-95-6 allyl bromide 
• 108-98-5 thiophenol 
• 873-55-2 sodium benzenesulfonate 
• 139449-21-1 3-phenylthio-2,3-dihydro-(4H)-benzopyran-4-one 
• 1776-09-6 3-bromochroman-4-one 

Relevant academic research and scientific papers

3-phenylsulfonyl-3-(2-propenyl)chroman-4-one

In the title compound, C18H16O4S, the pyran ring adopts a sofa conformation. The bond angles around the two planar C atoms in the ring deviate from their ideal values.

Metal-free desulfonylation reaction through visible-light photoredox catalysis

The desulfonylation of β-arylketosulfones has been achieved in good to excellent yields by using 3-W blue LEDs light, 1 mol-% organic dye eosin Y bis(tetrabutylammonium salt) as photocatalyst, and diisopropylethylamine as reducing agent. Mechanistic studies demonstrate that oxidative quenching of the excited eosin Y by β-arylketosulfones plays a crucial role in the present photoredox catalytic cycle. Reductive desulfonylation is essential to enable to use of a sulfone as an auxiliary group. For reductive removal of sulfones, highly aggressive metal-containing reducing agents and harsh reaction conditions are often employed. In this paper, metal-free desulfonylation of β-arylketosulfones can be achieved efficiently at room temperature under visible-light irradiation.

A Facile Synthesis of 3-Alkylchromanones and Chromones

A simple and high yielding route to 3-alkylchromanones and 3-alkylchromones has been achieved from 3-alkyl-3-phenylsulphonyl-4-chromanones.