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1.  3-[(E)-(3-tert-Butyl-1-phenyl-1H-pyrazol-5-yl)imino­methyl]quinolin-2(1H)-one: chains built by π-stacking of hydrogen-bonded R 2 2(8) dimers 
In the title compound, C23H22N4O, there is evidence for some bond fixation in the aryl component of the quinolinone unit. Pairs of mol­ecules related by inversion are linked into R 2 2(8) dimers by almost linear N—H⋯O hydrogen bonds, and dimers related by inversion are linked into chains by a single aromatic π–π stacking inter­action.
doi:10.1107/S0108270109033861
PMCID: PMC2758068  PMID: 19805879
2.  Sterically shielded pyramidal amino groups in two 4,4′-(aryl­methyl­ene)bis­(6-allyl-3-chloro-2-methyl­aniline) derivatives 
4,4′-(Phenyl­methyl­ene)bis­(6-allyl-3-chloro-2-methyl­aniline), C27H28Cl2N2, (I), and 4,4′-(2-thienylmethyl­ene)bis­(6-allyl-3-chloro-2-methyl­aniline), C25H26Cl2N2S, (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⋯π(arene) hydrogen bond to form cyclic centrosymmetric dimers, and these dimers are linked into statistically inter­rupted chains by a second C—H⋯π(arene) hydrogen bond involving a donor in the minor component of the disordered thienyl unit.
doi:10.1107/S0108270109031175
PMCID: PMC2737426  PMID: 19726866

Results 1-2 (2)