Applications of Isolated Indenylidene-Ruthenium Complexes in ROMP

3 Applications of Isolated Indenylidene-Ruthenium Complexes in ROMP 

The catalytic activities for ROMP of cyclooctene of isolated indenylidene complexes XV-XVII were evaluated in chlorobenzene (Table 8.3). 

Catalyst XV promoted the cyclooctene ROMP with an extremely low catalyst loading (30 000 1) reaching a TOF of 9200 min (Table 8.3, entries 1,2) but its activity decreased at a ratio 100000 1. The catalyst containing P Pr3 XVI showed excellent activity whereas, as expected, complex XVII with the poor electron donor and less bulky phosphine PPh3 showed low activity. 

Catalyst XV was also able to polymerize qrdopentene at extremely low loading (qrdopentene Ru = 10 000 1). Whereas at room temperature after initial gelifica-tion, due to polymerization, a decrease in viscosity was observed, at low temperature, —40 °C for 1 h, 98% of cydopentene polymer could be obtained. 

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