In the title compound, C(19)H(18)N(5)O, the imidazolidine ring makes dihedral angles of 87.62 (17) and 28.27 (11)° with the pyridine and benzene rings, respectively. An intra-molecular N-H⋯O hydrogen bond is observed between the carbonyl O atom and an imidazolidine H atom. In the crystal, an inter-molecular N-H⋯N hydrogen bond gives rise to a linear chain running along the b axis.

[3+2] Cycloaddition of azomethine imines with electron-deficient terminal alkynes was smoothly catalyzed by a chiral bis(imidazolidine)pyridine-CuOAc complex to give bicyclic pyrazolo[1,2-a]pyrazolone derivatives with up to 74% ee.

In the title compound, C(13)H(22)N(4)O(2)S(2), the six-membered ring displays a half-chair conformation. The olefin amine unit is close to being coplanar with the imidazolidine ring (r.m.s. deviation = 0.059 Å). The dithiol-ane ring adopts a twisted conformation. In the crystal, mol-ecules are linked by weak C-H⋯O inter-actions.

In the title mol-ecule, C(11)H(12)N(2)O(4), the dihedral angle between the benzene ring and imidazolidine ring is 7.1 (5)°. In the crystal structure, the hy-droxy groups are involved in the formation of inter-molecular O-H⋯O hydrogen bonds, which link the mol-ecules related by translation into C(2) chains along the b axis.

Crown-ether like interaction of two neutral [Cu2(μ-OH)(μ-L(1))] (H3L(1) = 2-(2'-hydroxyphenyl)-1,3-bis[4-(2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine) fragments, around a central Na(+) cation as self-assembly template, led to the formation of [Na{Cu2(μ-OH)(μ-L(1))}2]ClO4 (1). Di-tert-butyl group substituted H3L(2) {2-(3,5-di-tert-butyl-2-hydroxyphenyl)-1,3-bis[4-(3,5-di-tert-butyl-2-hyd...

In the title compound, C24H25ClN2, the methine, methyl-ene and methyl C atoms of the methyl-substituted imidazolidine ring are disordered over two sets of sites with a refined occupancy ratio of 0.834 (4):0.166 (4). Each disordered ring assumes an envelope conformation with an N atom as the flap. The pendant benzyl rings are oriented equatorially with respect to the imidazolidine ring. The chlo...

In the title salt, C(26)H(29)N(2) (+)·Br(-), which may serve as a precursor for N-heterocyclic carbenes, the imidazolidine ring adopts a twist conformation with a pseudo-twofold axis passing through the N-C-N carbon and the opposite C-C bond. The N-C-N bond angle [113.0 (4)°] and C-N bond lengths [1.313 (6) and 1.305 (6) Å] confirm the existence of strong resonance in this part of the mol-ecule...

In the title compound, C(13)H(22)N(2)O, the central imidazolidine ring is in an envelope conformation and the two cyclo-hexane rings adopt chair conformations. In the crystal structure, the mol-ecules are linked into centrosymmetric R(2) (2)(8) dimers by pairs of N-H⋯O hydrogen bonds.