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General scheme for ring-closing metathesis of diallyl derivatives. Reagents and conditions: a) Ru catalyst, BMIM; conventional conditions: 33 °C, 2 min, 4 % (16 a), 45 % (16 b); microwave irradiation: 33 °C (110 W), 2 min, 85 % (16 a), 91 % (16 b). Result: acceleration.
