1. Benzyl N-(3-chloro-4-fluoro-phen-yl)carbamate
Manavendra K Singh, Alka Agarwal, Satish K Awasthi Acta Crystallogr Sect E Struct Rep Online. 2011 May 1;67(Pt 5):o1137. doi: 10.1107/S1600536811012608. Epub 2011 Apr 16.
The title compound, C(14)H(11)ClFNO(2), the phenyl ring (A), the chloro-fluoro-phenyl ring (B) and the central ketone O/C/O group (C) are not coplanar, with dihedral angles B/C = 31.6 (2), A/B = 21.3 (2) and A/C = 50.1 (2)°. The crystal packing is stabilized by N-H⋯O and C-H⋯O inter-actions.
2. (2S,3R)-tert-Butyl N-[4-(N-benzyl-4-fluoro-benzene-sulfonamido)-3-hy-droxy-1-phenyl-butan-2-yl]carbamate
Marcele Moreth, Marcus V N de Souza, James L Wardell, Solange M S V Wardell, Edward R T Tiekink Acta Crystallogr Sect E Struct Rep Online. 2012 Apr 1;68(Pt 4):o1138-9. doi: 10.1107/S1600536812011440. Epub 2012 Mar 21.
In the title mol-ecule, C(28)H(33)FN(2)O(5)S, the mean plane about the tertiary amine group (sum of the angles subtended at the sp(2)-hybridized N atom = 359.7°) forms a dihedral angle of 16.66 (6)° with the phenyl ring adjacent to the carbamate group. The sulfonamide benzene ring and the hy-droxy group lie to either side of the C(2)NS plane, whereas the benzyl-phenyl (connected to the N atom) and carbamate substituents lie to the other side. Supra-molecular layers propagating in the ac plane are found in the crystal, linked by hy-droxy-sulfonamide O-H⋯O and carbamate-carbamate N-H⋯O hydrogen bonds along with C-H⋯O and C-H⋯π inter-actions.
3. Benzyl N-(2-hy-droxy-1-{N'-[(1E)-2-hy-droxy-benzyl-idene]hydrazinecarbon-yl}eth-yl)carbamate
Edward R T Tiekink, Marcus V N de Souza, Alessandra C Pinheiro, Solange M S V Wardell, James L Wardell Acta Crystallogr Sect E Struct Rep Online. 2011 Jul 1;67(Pt 7):o1866-7. doi: 10.1107/S1600536811025128. Epub 2011 Jun 30.
The mol-ecule of the title compound, C(18)H(19)N(3)O(5), adopts a curved arrangement with the terminal benzene rings lying to the same side. The hydroxyl-benzene ring is close to coplanar with the adjacent hydrazine residue [dihedral angle = 11.14 (12)°], an observation which correlates with the presence of an intra-molecular O-H⋯N hydrogen bond. The benzyl ring forms a dihedral angle of 50.84 (13)° with the adjacent carbamate group. A twist in the mol-ecule, at the chiral C atom, is reflected in the dihedral angle of 80.21 (12)° formed between the amide residues. In the crystal, two-dimensional arrays in the ac plane are mediated by O-H⋯O and N-H⋯O hydrogen bonds.
