Patent ID: 7576161

Claim:
A method for preparing an in situ telechelic polymer functionalized by having a heteroatomic chain end group, comprising quenching a cationic living polymer product or a terminal tert-chloride chain end of a carbocationic quasiliving polymer product in the presence of a Lewis acid, with an N-substituted pyrrole of formula I wherein: R 1 and R 2 are independently in each —(CR 1 R 2 )— unit selected from the group consisting of hydrogen and alkyl from C 1 to C 6 carbon atoms; m is an integer from 1 to 20; and X is selected from the group consisting of hydrogen, alkyl, aryl, alkaryl, alkoxy, heteroaryl, nitro, ureido, —OC(O)R 3 , —C(O)R 4 , —C(O)OR 5 , —C(O)NR 6 R 7 , —P(R 8 ) 3 , —P(OR 9 ) 3 , —SR 10 , —OSO 3 R 11 , and —S(O)R 12 ; wherein R 3 is alkyl or alkenyl; and R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , R 10 , R 11 , and R 12 are alkyl.