Patent ID: 8691998

Claim:
An N-heterocyclic carbene ligand precursor comprising a compound of Formula wherein n is 0 or 1: wherein R is independently: wherein at least one R is other than NR 2 R 3 ; wherein R 1 , R 2 , and R 3 are independently: H; C 1 to C 18 straight, branched, or multiply branched alkyl; benzyl; substituted benzyl; phenyl; substituted phenyl; napthyl; substituted napthyl; pyridyl; substituted pyridyl; quinolyl; substituted quinolyl; or pentafluorobenzyl, or combined R 2 R 3 is =CHR 1 , wherein the substituent is an alkyl, vinyl, alkenyl, alkynyl, or aryl group; and wherein in Z − is Cl − , Br − , I − , PF 6 − , SbF 6 − , − OSO 2 CF 3 , − OSO 2 C 6 H 5 or − OSO 2 C 6 H 4 —R 4 , where R 4 is an alkylene or oxyalkylene unit bridged with a polymer or polymeric resin.