In the title compound, C(16)H(14)Br(2)N(2), the complete molecule is generated by a crystallographic twofold axis. The dihedral angle between the two benzene rings is 35.28 (8)° and that between the best planes of two ethyl-idinehydrazine N-N=C-Me units is 87.67 (11)°. Each of these N/N/C/C planes makes a dihedral angle of 63.81 (10)° with the adjacent benzene ring. In the crystal, the mol-ecul...

The mol-ecule of the title compound, C(18)H(16)N(2)O(4), adopts a T-shaped conformation with E stereochemistry for the imine double bond. The (3-nitro-benzyl-idene)amino fragment is almost planar, the mean planes of phenyl ring and nitro group forming a dihedral angle of 8.9 (3)°. In the 3-phenyl-acryloyl unit, the acrylic ester fragment is also almost planar, with the phenyl ring twisted by 41...

The title compound, C(17)H(16)N(2)S(2), a dithio-carbazate derivative, adopts an EE configuration with respect to the C=C and C=N double bonds of the propenyl-idine group. The 3-phenyl-prop-2-enyl-idene and dithio-carbazate fragments lie essentially in the same plane, with a maximum deviation from that plane of 0.074 (2) Å, while the dihedral angle between the 3-phenyl-prop-2-enyl-idene and the...

A new version of the E-Cell simulation system,which runs on Windows as well as Linux, has been released as free software under the terms of the GNU General Public License.

In the title compound, C(11)H(12)N(2)S(2), the dithio-carbazate group adopts an EE configuration with respect to the C=C and C=N bonds of the propenyl-idene group. The atoms of the propenyl-idene and dithio-carbazate unit are essentially co-planar, with a maximum deviation of 0.058 (1) Å; the phenyl ring forms a dihedral angle of 18.3 (1)° with this fragment. In the crystal, mol-ecules form inv...

The production of two jets is the simplest exclusive quantum chromodynamics process in electron-positron annihilation. Using this process, we examine the structure of next-to-next-to-leading order (NNLO) corrections to jet production observables. We derive a subtraction formalism including double real radiation at tree level and single real radiation at one loop. For two-jet production, these s...

The title Schiff base compound, C(16)H(14)ClN, adopts E configurations with respect to both the C=C and C=N bonds. The dihedral angle between the two aromatic rings is 53.27 (4)°, while the plane through the C=C-C=N system is inclined at 9.06 (8)° to the benzene ring and 44.92 (5)° to the chloro-benzene ring. In the crystal structure, weak C-H⋯Cl and C-H⋯N hydrogen bonds stack the mol-ecules do...

The asymmetric unit of the title compound, 2C(6)H(12)N(4)·C(8)H(12)O(4), contains one half-mol-ecule of e,e-trans-cyclo-hexane-1,4-dicarb-oxy-lic acid (the complete molecule being generated by inversion symmetry) and one mol-ecule of hexa-methyl-ene-tetra-mine (HMTA), which are connected by O-H⋯N hydrogen bonds. This forms isolated trimers that pack in a herringbone fashion.

We show that e, π and other remarkable real numbers are limits of E-computable sequences of rational numbers having a polynomial rate of convergence (as usual, E denotes the second Grzegorczyk class). However, only the rational numbers are limits of E-computable sequences of rational numbers with an exponential rate of convergence