117139-08-9Relevant articles and documents
A New Synthesis of 3-Chlorocoumarins and Synthesis of Isocoumestan
Borse, Arvind P.,Kelkar, Shriniwas L.,Wadia, Murban S.
, p. 1180 - 1181 (2007/10/02)
The preformed complex of POCl3 and N,N-diethylchloroacetamide (1) on reaction with substituted salicylaldehydes (2a-e) yields 3-chlorocoumarins (4a-c) while with o-hydroxybenzophenones (5a-c) the products obtained have been characterised as 3-chloro-4-arylcoumarins (6a-c). 3-Chloro-4-(2'-hydroxyphenyl)coumarin (6d) on treatment with aq.KOH yields isocoumestan (7).