5,12-Dimethyl-3,10-diphenyl-1,3,4,8,10,11-hexaazatetracyclo[6.6.1.0(2,6).0(9,13)]pentadeca-2(6),4,9,(13),11-tetraene,a new Tröger's base analogue.

The synthesis of the title Tröger's base analogue, C(23)H(22)N(6), was undertaken in order to study the influence of a methyl substituent on the structure. Minor differences were found in the bond lengths of the title structure in comparison with the values for free pyrazole and for the first pyrazolic Tröger's base reported in the literature. There are two molecules of opposite chirality in the asymmetric unit and the packing in the lattice is characterized by a non-crystallographic n-glide plane relating these molecules.

2-Hydroxyphenyl 2-methylpyrazolo[1,5-a]pyrimidin-6-yl ketone.

The molecules of the title compound, C(14)H(11)N(3)O(2), form a three-dimensional soft hydrogen-bonded network involving C-H...N hydrogen bonds.

5,5-Dimethyl-3-(5-methyl-1H-pyrazol-3-ylamino)cyclohex-3-en-1-one

The molecules of the title compound, C(12)H(17)N(3)O, are linked by two N-H.O hydrogen bonds to form a three-dimensional network. The N. O distances are 2.804 (3) and 2.766 (3) A, both involving a common acceptor O atom.

Weak and strong hydrogen-bonding patterns in the structure of 2, 4-bis(2-hydroxybenzoyl)-2,3-dihydro-1H-pyrido

The title compound, C(25)H(19)NO(4)S, (IV), was produced by a cyclocondensation reaction similar to that which had previously produced an unexpected product, thus giving a novel route for such reactions. The structure of (IV) contains two S(6) motifs formed by strong intramolecular O-H.O hydrogen bonds. Weak C-H.O hydrogen bonds form primary C(11), R(1)(2)(7) and R(2)(2)(8) motifs which combine to form a complex three-dimensional network.