The beads of styrene

N-vinylpyrrolidone (10%) and divinylbenzene (3%) copolymer were synthesized and combined with titanium tetrachloriele in chloroform to form a stable complex containing 14.12% of chlorine which correspond to 9.94 ×10-4 mol TiCl4/l g complex beads. The complex can be used to catalyze a lot of organic reactions in high yield

such as esterifica-tions

acetalizations

ketal formations

etherifications and the Friedel-Crafts alkylation. The complex is more stable and more reactive than polystyrene-titainium tetrachloride complex

and can be reused at least 7 times.