US Patent:
20020022723, Feb 21, 2002
Inventors:
Michael Detty - Rochester NY, US
Peter Virkler - Buffalo NY, US
International Classification:
C07D345/00
C07D335/02
Abstract:
The present invention provides a novel method for the synthesis of an intermediate dye product having the following formula: wherein L is S, Te, or Se; Rand Rare either the same or different aryl or alkyl compounds; Ris hydrogen or a short chain alkyl group; and Z is an anion. The process to formulate this intermediate compound entails reacting an R-acetylene compound with an R-acetylene compound (compounds A) into an enol ether compound with the Rand/or Rconstituents (compound D) And from compound D, it forms into an intermediate dye compound having an L-based cyclic ring with the Rand/or Rconstituents (compound F). With compound F the desired dye can be made with a greater overall yield for mass production.