Two cationic carbene complexes with no heteroatom in the ring containing the carbene carbon, trans-bromo(2-methyl-2,6-dihydroisoquinolin-6-ylidene)bis(triphenylphosphine)palladium(II) triflate (3) and trans-chloro(1,2-dimethyl-1,7-dihydroquinolin-7-ylidene)bis(triphenylphosphine)palladium(II) triflate (4), were synthesized by oxidative substitution of Pd(PPh3)4 with N-methylated 6-bromoisoquinolinium and 7-chloro-2-methylquinolinium cations, respectively. Compound 3 was also prepared by methylation of neutral trans-bromo(2-methylisoquinolin-6-yl)bis(triphenylphosphine)palladium(II) (5). All complexes were unambiguously characterized by NMR and X-ray crystallographic studies.
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Schuster et al. (2006) studied this question.
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