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1,2,4,5-Tetra-methyl-3,6-diphenyl-1,2,4,5-tetra-aza-3,6-diphosphinane.

ABSTRACT: The title compound, C(16)H(22)N(4)P(2), crystallizes about a centre of symmetry, leading to a chair conformation of the heterocyclic ring as is commonly found for this type of compound.

SUBMITTER: Kriel FH

PROVIDER: S-EPMC2960921 | biostudies-literature |

REPOSITORIES: biostudies-literature

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1-Benzoyl-3,6-diphenyl-1,4-dihydro-1,2,4,5-tetra-zine.

Project description:In the title compound, C(21)H(16)N(4)O, the central tetra-zine ring adopts an unsymmetrical boat conformation with the two N atoms as the bow and stern. The crystal packing is stabilized by inter-molecular N-H-O hydrogen bonds.

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N(1),N(4),3,6-Tetra-methyl-1,2,4,5-tetra-zine-1,4-dicarboxamide.

Project description:The asymmetric unit of the title compound, C(8)H(14)N(6)O(2), contains two independent mol-ecules. In one mol-ecule, the amide-substituted N atoms of the tetra-zine ring deviate from the plane [maximum deviation = 0.028?(1)?Å] through the four other atoms in the ring by 0.350?(2) and 0.344?(2)?Å, forming a boat conformation, and the mean planes of the two carboxamide groups form dihedral angles of 10.46?(13) and 20.41?(12)° with the four approximtely planar atoms in the tetra-zine ring. In the other mol-ecule, the amide-substituted N atoms of the tetra-zine ring deviate from the plane [maximum deviation = 0.033?(1)?Å] through the four other atoms in the ring by 0.324?(2) and 0.307?(2)?Å, forming a boat conformation, and the mean planes of the two carboxamide groups form dihedral angles of 14.66?(11) and 17.08?(10)° with the four approximately planar atoms of the tetra-zine ring. In the crystal, N-H?O hydrogen bonds connect mol-ecules to form a two-dimensional network parallel to (1-1-1). Intra-molecular N-H?N hydrogen bonds are observed.

| S-EPMC3379411 | biostudies-literature

3,6-Diacetyl-1,4-diphenyl-1,4-dihydro-1,2,4,5-tetra-zine.

Project description:In the title compound, C(18)H(16)N(4)O(2), the central six-membered ring has a boat conformation.

| S-EPMC2960815 | biostudies-other

Bis(1-ethyl-3-methyl-imidazolium) 3,6-diselanyl-idene-1,2,4,5-tetra-selena-3,6-diphospha-cyclo-hexane-3,6-di-selen-olate.

Project description:In the title compound, 2C6H11N2 (+)·P2Se8 (2-) or [EMIM]2P2Se8 (EMIM = 1-ethyl-3-methyl-imidazolium), the anions, located about inversion centers between EMIM cations, exhibit a cyclo-hexane-like chair conformation. The cations are found in columns along the a axis, with centroid-centroid distances of 3.8399 (3) and 4.7530 (2) Å. The observed P-Se distances and Se-P-Se angles agree with other salts of this anion.

| S-EPMC3793835 | biostudies-literature

4,4'-(1,2,4,5-Tetra-zine-3,6-di-yl)dibenzo-nitrile.

Project description:Mol-ecules of the title compound, C(16)H(8)N(6), lie on crystallographic inversion centres. A dihedral angle of 16.1 (1)° is formed between the central tetra-zine ring and the plane of each cyano-phenyl group. The mol-ecules form stacks along [100] with a perpendicular inter-planar separation of 3.25 (1) Å. C-H⋯N inter-actions are formed between mol-ecules in neighbouring stacks.

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3,6-Di-4-pyridyl-1,4-dihydro-1,2,4,5-tetra-zine.

Project description:The mol-ecule of the title compound, C(12)H(10)N(6), which is V-shaped due to the boat conformation of the dihydro-tetra-zine ring, has crystallographic C(2) symmetry. The dihedral angle between the planes of the two pyridine rings is 31.57 (3)°. Mol-ecules are linked by weak N-H⋯N and C-H⋯N hydrogen bonds, forming a two-dimensional polymeric structure.

| S-EPMC2961757 | biostudies-literature

N,N'-Bis(2,6-diisopropyl-phen-yl)-3,6-di-methyl-1,2,4,5-tetra-zine-1,4-dicarboxamide.

Project description:In the title mol-ecule, C(30)H(42)N(6)O(2), the amide-substituted N atoms of the tetra-zine ring deviate from the approximate plane of the four other atoms in the ring by 0.457?(3) and 0.463?(3)?Å, forming a boat conformation. The two benzene rings form a dihedral angle of 47.69?(9)°. Intra-molecular N-H?N and weak C-H?O hydrogen bonds are observed.

| S-EPMC3379227 | biostudies-other

(3,6-Dimethyl-1,2,4,5-tetra-zine-1,4-di-yl)bis-[(morpholin-4-yl)methanone].

Project description:In the title mol-ecule, C(14)H(22)N(6)O(4), the amide-substituted N atoms of the tetra-zine ring deviate from the approximate plane of the four other atoms in the ring by 0.160 (2) and 0.243 (2) Å, forming a slight boat conformation. The morpholine rings are in chair conformations.

| S-EPMC3295465 | biostudies-literature

3,6-Dimethyl-N,N-bis-(pyridin-2-yl)-1,2,4,5-tetra-zine-1,4-dicarboxamide.

Project description:In the title mol-ecule, C(16)H(16)N(8)O(2), four atoms of the tetra-zine ring are coplanar, with the largest deviation from the plane being 0.0236 (12) Å; the other two atoms of the tetra-zine ring deviate on the same side from this plane by 0.320 (4) and 0.335 (4) Å. Therefore, the central tetra-zine ring exhibits a boat conformation. The dihedral angles between the mean plane of the four coplanar atoms of the tetrazine ring and the two pyridine rings are 26.22 (10) and 6.97 (5)°. The two pyridine rings form a dihedral angle of 31.27 (8)°. In the molecule, there are a number of short C-H⋯O interactions. In the crystal, molecules are linked via a C-H⋯O interaction to form zigzag chains propagating along the [010] direction.

| S-EPMC3295480 | biostudies-literature

1,2,4,5-Tetra-fluoro-3,6-diiodo-benzene-2,3-bis-(pyridin-2-yl)pyrazine (1/1).

Project description:The components of the title 1:1 co-crystal, C(14)H(10)N(4)·C(6)F(4)I(2), are connected via an N?I [2.959?(4)?Å] halogen bond, in which the N atom is part of the relatively electron-rich pyrazine ring. The C(6)F(4)I(2) mol-ecule is almost planar [r.m.s. deviation = 0.038?Å] but there are significant twists in the pyrazine derivative, as seen in the dihedral angles [31.3?(2) and 54.6?(2)°] formed between the pendant pyridyl rings and the central pyrazine ring. The bimolecular aggregates are sustained in the crystal by C-H?F and ?-? inter-actions [ring centroid(pyrid-yl)-ring centroid(benzene) = 3.678?(3)?Å].

| S-EPMC3009248 | biostudies-literature

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