Optimization of the reaction of phthalic anhydride with P4S10

Polyisothianaphthene can be synthesized by reaction of phthalic anhydride w ith P4S10. To make the reaction economically, as well as ecologically accep table it was necesary to increase the yield of PITN. Therefore, the influen ce of reaction parameters such as reaction time, quantity of xylene and cat alyst were investigated. Changing these parameters a yield of 85% was achie ved what is almost double the value achieved in previous experiments.