The asymmetric unit of the crystal structure of the title compound, C(14)H(15)NO(2)S, contains two mol-ecules. The conformations of the N-C bonds in the C-SO(2)-NH-C segments of the structure have trans and gauche torsion angles with the S=O bonds. Furthermore, the torsion angles of the C-SO(2)-NH-C groups in the two mol-ecules are 46.1 (3) (glide image of mol-ecule 1) and 47.7 (3)° (mol-ecule ...

The title salt, 2C3H8N(+)·C2O4 (2-), crystallized with six independent allyl-ammonium cations and three independent oxalate dianions in the asymmetric unit. One of the oxalate dianions is nearly planar [dihedral angle between CO2 planes = 1.91 (19)°], while the other two are twisted with angles of 11.3 (3) and 26.09 (13)°. One cation has a synperiplanar (cis) conformation with an N-C-C-C torsio...

The title compound, C(15)H(25)N(5), is an aminalization product between 2,6-diacetyl-pyridine and 1,3-diamino-propane. It crystallizes with two independent mol-ecules in the asymmetric unit with different conformations. In the first mol-ecule, the methyl groups are cis oriented with respect to the pyridine ring [N-C-C-C torsion angles = 72.5 (1) and 80.3 (1)°], while they are trans oriented in ...

In the title 1:1 adduct, C(6)H(6)N(2)O·C(11)H(8)O(2), the amide group is slightly twisted out of the plane of the aromatic ring, with a C-C-C-N torsion angle of 25.11 (19)°, whereas the carb-oxy-lic acid group is approximately coplanar with the bicylic ring system, with a C-C-C-O torsion angle of 10.9 (2)°. The amide groups from two isonicotinamide mol-ecules form a dimer via N-H⋯O hydrogen bon...

The title compound, C(17)H(17)NO(5), crystallizes with two mol-ecules (A and B) in the asymmetric unit. The conformational structures of the two mol-ecules show small but significant differences in the dihedral angles between the two aryl rings with values of 18.8 (1)° for mol-ecule A and 7.5 (1)° for mol-ecule B. In mol-ecule A, the propano-ate group is twisted out of the plane of the benzene ...

Two independent thio-urea derivatives comprise the asymmetric unit of the title compound, C(14)H(20)N(2)OS. The major difference between the mol-ecules relates to a twist in the relative orientation of the benzene rings [torsion angles = 4.5 (2) and -19.9 (2)° for the two independent mol-ecules]. The thio-carbonyl and carbonyl groups lie to opposite sides of the mol-ecule as there are twists ab...

The title compound, C(13)H(9)F(3)N(2)O(2)S, crystallizes with two independent mol-ecules in the asymmetric unit. The central thio-urea core is roughly coplanar with the furan and benzene rings, showing O-C-N-C(S) torsion angles of 2.3 (4) and -11.4 (2)° and (S)C-N-C-C torsion angles of -2.4 (4) and -28.8 (4)°, respectively, in the two independent mol-ecules. The trans-cis geometry of the thio-u...

The asymmetric unit of the title compound, C(23)H(23)N(3)O(2), contains two mol-ecules in both of which, one amide N atom is in a syn position with respect to the pyridine N atom, while the other amide N atom is in an anti position (the syn--anti conformation). There are minor conformational differences between the two mol-ecules, as reflected in the N(pyridine)-C-C-N(amide) torsion angles of -...

Let G be a unital group with a finite unit interval E, let n be the number of atoms in E, and let κ be the number of extreme points of the state spaceΩ(G). We introduce canonical order-preserving group homomorphisms ξ : Zn → G and ρ : G → Zκ linking G with the simplicial groups Zn and Zκ . We show that ξ is a surjection and ρ is an injection if and only if G is torsion-free. We give an explicit...

The pyrazole ring in the title compound, C25H19BrN2O2, is almost planar (r.m.s. deviation = 0.003 Å) and forms dihedral angles of 7.56 (13) and 56.48 (13)° with the N- and C-bound benzene rings, respectively. The prop-2-en-1-one residue has an E conformation about the C=C double bond [1.328 (4) Å] and is almost coplanar with the pyrazole ring [C-C-C-C torsion angle = -174.4 (3)°]. A twist betwe...