| abstract |
The present invention provides a process for producing a compound of the formulan(III):n nwherein R 1 and R 3 are independently hydrogen or an organic group: R 2 is an organicngroup; and R 4 is an optionally substituted aryl, nby reacting the compound of formula (I):n nwherein R 1 , R 2 , and R 3 are as defined above, with the compound of formula (II):n R 4 -S-Hal nwherein R 4 is as defined above and Hal is halogen, in the presence of base. |