Browsing by Autor "Alirio Palma"

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Crystal Structure of 2-Exo-Phenyl-2,3,4,5-Tetrahydro-1,4-Epoxinafto[1,2-b]azepine
(Springer Science+Business Media, 2011) Vicmar E. Gonzalez; Luis A. Vizcaya; Asiloé J. Mora; Gerzón E. Delgado; Alı́ Bahsas; A.F. Yepes; Alirio Palma
Four differently substituted 2-aryl-2,3,4,5-tetrahydro-1<i>H</i>-1,4-epoxy-1-benzazepines: hydrogen-bonded structures in one, two and three dimensions
(Wiley, 2009) S.L. Gomez; Carlos M. Sanabría; Alirio Palma; Alı́ Bahsas; Justo Cobo; Christopher Glidewell
In (2RS,4SR)-7-chloro-2-exo-(2-chloro-6-fluorophenyl)-2,3,4,5-tetrahydro-1H-1,4-epoxy-1-benzazepine, C(16)H(12)Cl(2)FNO, (I), molecules are linked into chains by a single C-H...pi(arene) hydrogen bond. (2RS,4SR)-2-exo-(2-Chloro-6-fluorophenyl)-2,3,4,5-tetrahydro-1H-1,4-epoxy-1-benzazepine, C(16)H(13)ClFNO, (II), is isomorphous with compound (I) but not strictly isostructural with it, as the hydrogen-bonded chains in (II) are linked into sheets by an aromatic pi-pi stacking interaction. The molecules of (2RS,4SR)-7-methyl-2-exo-(4-methylphenyl)-2,3,4,5-tetrahydro-1H-1,4-epoxy-1-benzazepine, C(18)H(19)NO, (III), are linked into sheets by a combination of C-H...N and C-H...pi(arene) hydrogen bonds. (2S,4R)-2-exo-(2-Chlorophenyl)-2,3,4,5-tetrahydro-1H-1,4-epoxy-1-benzazepine, C(16)H(14)ClNO, (IV), crystallizes as a single enantiomer and the molecules are linked into a three-dimensional framework structure by a combination of one C-H...O hydrogen bond and three C-H...pi(arene) hydrogen bonds.
Sterically shielded pyramidal amino groups in two 4,4′-(arylmethylene)bis(6-allyl-3-chloro-2-methylaniline) derivatives
(Wiley, 2009) M.C. Blanco; Alirio Palma; Alı́ Bahsas; Michael B. Hursthouse; Justo Cobo; Christopher Glidewell
4,4'-(Phenylmethylene)bis(6-allyl-3-chloro-2-methylaniline), C(27)H(28)Cl(2)N(2), (I), and 4,4'-(2-thienylmethylene)bis(6-allyl-3-chloro-2-methylaniline), C(25)H(26)Cl(2)N(2)S, (II), adopt similar molecular conformations, although the thienyl group in (II) exhibits orientational disorder over two sets of sites with occupancies of 0.614 (3) and 0.386 (3). The amino groups in both compounds are pyramidal. A single N-H...N hydrogen bond links the molecules of (I) into cyclic centrosymmetric dimers. Molecules of (II) are linked by an ordered C-H...pi(arene) hydrogen bond to form cyclic centrosymmetric dimers, and these dimers are linked into statistically interrupted chains by a second C-H...pi(arene) hydrogen bond involving a donor in the minor component of the disordered thienyl unit.