Model porphyrin precursors:: 1,2,4,5-tetrakis(cyanomethyl)benzene, methyl 3,4,5-triacetoxybenzoate and 2-(N-phthalimidomethyl)benzoic acid

In the crystalline state, the centrosymmetric molecule 1,2,4,5-tetrakis(cyanomethyl)benzene, C14H10N4, has one cyanomethyl group in the benzene plane and one cyanomethyl group rotated 67.2 (2)degrees out of the benzene plane. Molecules of methyl. 3,4,5-triacetoxybenzoate, C14H14O8, form chains with each molecule twisted +/-89.6 (1)degrees from the preceding molecule. In this orientation, a close C-H ... O contact is formed, with an H ... O distance of 2.34 Angstrom. The structure of 2-(N-phthalimidomethyl)benzoic acid, C16H11NO4, reveals hydrogen-bonded dimers linked by the carboxyl groups of adjacent molecules. The O4 ... O3 distance is 2.636 (2) Angstrom and the O4-H ... O3 angle is 171(2)degrees.