Abstract We present two novel symmetric olefins bearing hydrogen bonding moieties for the direct capping of living ring opening metathesis polymerization-chains using Grubbs catalyst 1st-and 3rd-generation. The symmetric olefins are generated via homo metathesis of the corresponding α-olefins under aid of microwave irradiation and are used to prepare polynorbornene-chains (M n= 4,000–10,000 g/mol, M w/M n= 1.1–1.4) bearing barbiturate ...