Download citation
Download citation

link to html
Crystal structures are reported for three substituted 1H-imid­azole-4,5-dicarbo­nitrile compounds used as catalysts for the coupling reaction of nucleoside methyl phosphon­amidites, namely 2-(3′,5′-di­methyl­biphenyl-2-yl)-1H-imid­azole-4,5-di­carbo­nitrile, C19H14N4, (I), 2-(2′,4′,6′-tri­methyl­biphenyl-2-yl)-1H-imid­azole-4,5-dicarbo­nitrile, C20H16N4, (II), and 2-[8-(3,5-dimethyl­phen­yl)naphthalen-1-yl]-1H-imid­azole-4,5-dicarbonitrile, C23H16N4, (III). The asymmetric unit of (I) contains two independent mol­ecules with similar conformations. There is steric repulsion between the imid­azole group and the terminal phenyl group in all three compounds, resulting in the nonplanarity of the mol­ecules. The naphthalene group of (III) shows significant deviation from planarity. The C—N bond lengths in the imidazole rings range from 1.325 (2) to 1.377 (2) Å. The mol­ecules are connected into zigzag chains by inter­molecular N—H...Nimidazole [for (I)] or N—H...·Ncyano [for (II) and (III)] hydrogen bonds.

Download citation
Download citation

link to html
The conformations of the anilino(phenyl)methyl groups are similar in four related diethyl [(aryl­amino)­(4-ethynyl­phenyl)methyl]phosphon­ates. In each compound, the P—C bond has an approximate staggered conformation, with the aniline and ethynyl­phenyl groups in gauche positions with respect to the P=O double bond, and the two six-membered rings are almost perpendicular.
Follow Acta Cryst. C
Sign up for e-alerts
Follow Acta Cryst. on Twitter
Follow us on facebook
Sign up for RSS feeds