Authors : Pande H. ,Gadegone S. , Yadav H. Singh
Page Nos : 301-304
Description :
Abstract:
Photochromic materials are those which react reversibly to light. Photochromism is therefore distinguished from the familiar photographic processes, which because of the chemical development of the images, are essentially irreversible. Many organic materials, and a few inorganic ones, show this phenomenon. One pot synthesis of acid esters by Stobbe condensation of alkylidene / arylidene succinates and aldehydes or ketones, their subsequent hydrolysis to diacids and the formation of photochromic fulgides by cyclisation using different reagents are reported.
Key Words : green synthesis, anhydrides,Stobbe condensation, cyclised products.
