Method for preparation of an intermediate dye product
申请人:——
公开号:US20020022723A1
公开(公告)日:2002-02-21
The present invention provides a novel method for the synthesis of an intermediate dye product having the following formula:
1
wherein
L is S, Te, or Se;
R
1
and R
2
are either the same or different aryl or alkyl compounds;
R
3
is hydrogen or a short chain alkyl group; and
Z is an anion.
The process to formulate this intermediate compound entails reacting an R
1
-acetylene compound with an R
2
-acetylene compound (compounds A) into an enol ether compound with the R
1
and/or R
2
constituents (compound D) And from compound D, it forms into an intermediate dye compound having an L-based cyclic ring with the R
1
and/or R
2
constituents (compound F). With compound F the desired dye can be made with a greater overall yield for mass production.