potassium carbonate 1.) neat, 170 degC; 2.) DMF; Yield given. Multistep reaction. Yields of byproduct given;

1: 10 percent / decahydronaphthalene / 16 h / 180 °C 2: 83 percent / K2CO3 / acetone / 8 h / Heating 3: 83 percent / tetrahydrofuran / 2 h / 20 °C 4: 82 percent / [Ph-CH=RuCl2(PCy3)2] / CH2Cl2 / 2 h / 20 °C View Scheme

1.1: K2CO3 / acetone 2.1: potassium tert-butoxide / tetrahydrofuran / 0.17 h 2.2: 78 percent / tetrahydrofuran 3.1: 93 percent / Grubbs catalyst / CH2Cl2 / 2 h / 20 °C View Scheme

1: K2CO3 / acetone View Scheme