M. Ahmed et al., Second generation recyclable 'boomerang' polymer supported catalysts for olefin metathesis: Aplication of arduengo carbene complexes, SYNLETT, (7), 2000, pp. 1007-1009
Four consecutive ring closing metathesis reactions could be run with almost
no loss of activity using the second generation recyclable 'boomerang' pol
ymer supported catalyst 4.