lithium in tetrahydrofuran; ammonia 4 h;

1: 41 percent / potassium tert-butoxide / benzene; pentane / 10.5 h 2: 92 percent / hydrogen / 5percent Pd-C / ethyl acetate 3: 77 percent / methyllithium / diethyl ether / 3 h / other tricyclic cyclopropylidene precursors, reaction regiospecificity 4: 65 percent / AgClO4 / benzene / 24 h / Ambient temperature 5: 20 mg / 2,3-dichloro-5,6-dicyanobenzoquinone / benzene / 24 h / Ambient temperature View Scheme