2,3-dicyano-5,6-dichloro-p-benzoquinone in acetonitrile

selenium(IV) oxide in 1,4-dioxane 1 h; Heating;

1: 84 percent / 1,5-diazabicyclo<5.4.0>undecene-5 / tetrahydrofuran / Ambient temperature 2: 84 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / acetonitrile View Scheme

selenium(IV) oxide in ethyl acetate 3 h; Heating;