10-(4-Fluoro­benzyl­idene)­anthrone

The title compound, C₂₁H₁₃FO, was prepared from anthrone and 4-fluoro­benz­aldehyde. The central six-membered ring has an asymmetric boat conformation, in which the carbonyl C and the opposite C atom deviate from the plane of the other four atoms by 0.173 (2) and 0.319 (2) Å, respectively.

3,6-Di­phenyl-1,4-bis­(p-tolylsulfonyl)-1,4-di­hydro-1,2,4,5-tetrazine

The central six-membered ring of the title compound, C₂₈H₂₄N₄O₄S₂, has a boat conformation, in which the N atoms bonded to sulfonyl groups deviate from the plane of the other four atoms by 0.389 (4) and 0.343 (4) Å.

3,6-Di­propyl-N,N'-di-o-tolyl-1,2,4,5-tetrazine-1,4-dicarbox­amide

The title compound, C₂₄H₃₀N₆O₂, crystallizes with two mol­ecules in the asymmetric unit, both lying on twofold rotation axes. In both mol­ecules, the central tetrazine ring adopts a boat conformation.