4-(N,N-dimethlyamino)pyridine in dichloromethane 2 h;

1: 50 percent / lithium diisopropyl amide; potassium tert-butoxide / tetrahydrofuran / 2 h / -50 °C 2: 92 percent / 4-(N,N-dimethylamino)pyridine / CH2Cl2 / 2 h View Scheme

Grubb's 2nd generation catalyst in dichloromethane

1: (SPY-5-31)-dichloro-(κ2(C,O)-(2-isopropyloxybenzylidene))(1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazol-2-ylidene)ruthenium / dichloromethane 2: copper(l) iodide; potassium carbonate; sodium iodide / N,N-dimethyl-formamide 3: platinum(IV) oxide; hydrogen 4: sodium iodide View Scheme

tris(tetra-n-butylammonium)hydrogen diphosphate in acetonitrile T=20°C;