The title compound, C(7)H(8)N(2)O(2), is monoclinic (space group P2(1)/n) at 295 (2) K with Z' = 2. The two types of molecule form independent C(7) chains, and the structure is related to that of the low-temperature triclinic polymorph, where Z' = 4 in P1, by a simple displacive transformation.

We construct compact type IIB orientifolds with discrete groups Z 4 , Z 6 , Z ′ 6 , Z 8 , Z 12 and Z ′ 12. These models are N = 1 supersymmetric in D = 4 and have vector structure. The possibility of having vector structure in Z N orientifolds with even N arises due to an alternative Ω-projection in the twisted sectors. Some of the models without vector structure are known to be inconsistent be...

The generalized Petersen graph GP(n, k), n > 2 and 1 < k & n 1, has vertex-set (uO,ul ,..., u *-,, vO,u ,,..., v,_,) and edge-set (u,ui+,,uioi,vivi+,:O 8.

The complete molecule of the title compound, C(24)H(22)N(4)O(2), is generated by a crystallographic inversion centre located at the mid-point of the central C-C bond. The quinoline ring system and the hexyl chain are both essentially planar, and the dihedral angle between them is 46.30 (2)°. Intra-molecular N-H⋯N and C-H⋯O hydrogen bonds form five- and six-numbered rings, respectively. The crys...

Structures are reported here for eight further substituted N-aryl-2-chloronicotinamides, 2-ClC(5)H(3)NCONHC(6)H(4)X-4'. When X = H, compound (I) (C(12)H(9)ClN(2)O), the molecules are linked into sheets by N-H...N, C-H...pi(pyridyl) and C-H...pi(arene) hydrogen bonds. For X = CH(3), compound (II) (C(13)H(11)ClN(2)O, triclinic P1 with Z' = 2), the molecules are linked into sheets by N-H...O, C-H....

11-Chloro-3-methoxy-2-undecenal was synthesized from 8-bromooctanol, and an annelation reaction with this aldehyde and ethyl acetoacetate proceeded to give the ethyl 6-(8-chlorooctyl)salicylate. Ethyl 6-(8-chlorooctyl)salicylate was converted to ethyl 6-(7-formylheptyl)-2-methoxybenzoate through the iodide after protection of the phenolic hydroxyl group. Finally, the Wittig reaction with the al...