Strategies in the synthesis of dibenzo[]heteropines.

The dibenzo[]azepine skeleton is important in the pharmaceutical industry, not only in terms of existing commercial antidepressants, anxiolytics and anticonvulsants, but also in reengineering for other applications. More recently, the potential of the dibenzo[]azepine moiety in organic light emitting diodes and dye-sensitized solar cell dyes has been recognised, while catalysts and molecular organic frameworks with dibenzo[]azepine derived ligands have also been reported. This review provides a brief overview of the different synthetic strategies to dibenzo[]azepines and other dibenzo[]heteropines.

NMR data of a Grubbs 2 generation catalyst -cresolate derivative.

The data presented in this article is related to the research article entitled "Spectroscopic characterisation of Grubbs 2 generation catalyst and its -cresol derivatives" (Swart 2021). The 1D and 2D NMR characterisation data of the cresol derivative of the Grubbs 2 generation catalyst, where one of the chloride ligands is replaced by the -cresolate to form a Ru-O coordination compound () is reported. The characterization data include information obtained from H, C, Heteronuclear Single Quantum Coherence (HSQC), Heteronuclear Multiple Bond Correlation (HMBC), Homonuclear Correlation Spectroscopy (COSY), Nuclear Overhauser Effect (NOE) and Distortionless Enhancement by Polarization Transfer (DEPT) NMR spectroscopy.

The role of neutral and ionized oxygen defects in the emission of tin oxide nanocrystals for near white light application.

Tin oxide (SnO2) nanocrystals (NCs) based phosphor was synthesized by a green chemistry microwave-assisted hydrothermal method at different reactor pressures. The x-ray diffraction analysis showed that a single rutile SnO2 phase with a tetragonal lattice structure was formed. The photoluminescence emission was measured for He-Cd laser excitation at 325 nm and it showed a broad band emission from 400 to 800 nm for all the synthesized reactor pressures.

2,5-Dihexyl-thio-phene 1,1-dioxide.

In the title mol-ecule, C16H28O2S, the two n-hexyl groups are in all-trans conformations. Their C atoms are situated close to the plane of the thio-phene ring with a maximum deviation of 0.718 (6) Å for one of the terminal methyl groups.

4-(2-Bromo-phen-yl)-2-phenyl-pyrano[3,2-c]chromen-5(4H)-one.

In the title compound, C24H15BrO3, the pyran-ochromenone ring is essentially planar, while the 2-bromo-phenyl group is almost perpendicular to it [85.58 (6)°]. In the crystal, inversion dimers linked by pairs of weak C-H⋯π bonds occur; there is also a short inter-atomic contact found between the Br and carbonyl O atoms [3.

μ-(2,2'-Bipyrimidine)-bis-[dichlorido-palladium(II)] dimethyl-formamide monosolvate.

In the title compound, [Pd(2)Cl(4)(C(8)H(6)N(4))]·C(3)H(7)NO, the two Pd(2+) cations have a distorted square-planar coordination sphere and are bridged by a bis-bidentate 2,2'-bipyrimidine ligand. Two terminal chloride anions are also bonded to each of the Pd(2+) cations. The dinuclear complex and the dimethylformamide solvate molecule lie on the inter-section of a twofold rotation axis and a mirror plane, with disorder present in the solvate mol-ecule.

1-(3-Benzyl-4,6-dibenz-yloxy-2-hy-droxy-phen-yl)ethanone.

The title compound, C(29)H(26)O(4), is essentially planar in the acetophenone portion that includes both the hy-droxy and a benz-yloxy O atoms, with an r.m.s.

5-(3,4-Dimeth-oxy-benzyl-idene)-1,3-dimethyl-1,3-diazinane-2,4,6-trione.

In the title compound, C(15)H(16)N(2)O(5), the dihedral angle between 1,3-diazinane and benzene rings is only 4.27 (1)°. The essentially planar mol-ecular structure is characterized by a short intra-molecular C-H⋯O separation and by an exceptionally large bond angle of 138.

Dimethyl 2,6-dimethyl-4-phenyl-pyridine-3,5-dicarboxyl-ate.

In the title compound, C(17)H(17)NO(4), the dihedral angle between the benzene and pyridine rings is 75.51 (4)°. The benzene and pyridine rings are both approximately planar (r.

Racemic tricarbon-yl[7-meth-oxy-2-(η-phen-yl)chromane]-chromium(0).

In the title compound, [Cr(C(16)H(16)O(2))(CO)(3)], the Cr(0) atom of the Cr(CO)(3) unit is coordinated to the phenyl ring of the flavan ligand in an η(6) mode, with a normal arene-to-metal distance. The Cr(CO)(3) unit exhibits a three-legged piano-stool conformation, while the dihydro-pyran ring displays a distorted envelope configuration. The phenyl ring is twisted away from the fused ring system by 25.

4,5-Bis(2,4-di-tert-butyl-phen-oxy)phthalonitrile.

In the title compound, C(36)H(44)N(2)O(2), the dihedral angles between the phthalonitrile ring and the two di-tert-butyl-benzene rings are 68.134 (8) and 70.637 (11)°.

2',3,4,4',5-Penta-meth-oxy-chalcone.

In the title chalcone [systemetic name 1-(2,4-dimeth-oxy-phen-yl)-3-(3,4,5-trimeth-oxy-phen-yl)prop-2-en-1-one], C(20)H(22)O(6), the dihedral angle between the plane of the two benzene rings is 7.03 (4)° with all but one of the meth-oxy groups essentially co-planar with these rings [C-C-O-C torsion angles = -76.1 (2), -0.

Racemic tricarbonyl[(4a,5,6,7,8,8a-η)-2-phenyl-3,4-dihydro-2H-1-benzopyran]chromium(0).

The title compound, [Cr(C(15)H(14)O)(CO)(3)], displays a distorted envelope configuration of the dihydro-pyrane ring. The dihedral angle between the phenyl and phenyl-ene rings is 50.63 (4)°.

Racemic tricarbon-yl(η-7-meth-oxy-flavan)chromium(0).

IN THE TITLE COMPOUND [SYSTEMATIC NAME: tricarbonyl(η(6)-7-methoxy-2-phenyl-3,4-dihydro-2H-1-benzopyran)chromium(0)], [Cr(C(16)H(16)O(2))(CO)(3)], the Cr(CO)(3) unit is coordinated by the phenyl-ene ring of the flavan ligand, exhibiting a three-legged piano-stool conformation, with a point to plane distance of 1.750 (1) Å. The phenyl ring is twisted away from the fused ring system by 36.

2',3,4,4'-Tetra-meth-oxy-chalcone.

IN THE TITLE COMPOUND [SYSTEMATIC NAME: 1-(2,4-dimethoxyphenyl)-3-(3,4-dimethoxyphenyl)prop-2-en-1-one], C(19)H(20)O(5), the dihedral angle between the benzene rings is 26.88 (5)°. One of the meth-oxy groups is twisted slightly away from the plane [C-O-C-C torsion angle = -12.

Tricarbon-yl(η-flavone)chromium(0).

In the title compound, [Cr(C(15)H(10)O(2))(CO)(3)], the Cr(CO)(3) unit exhibits a three-legged piano-stool conformation. The chromium metal centre is coordinated by the phenyl ring of the flavone ligand [Cr-(phenyl centroid) distance = 1.709 (1) Å].

Tricarbon-yl(η-4',7-dimethoxy-iso-flavone)chromium(0).

The metal atom of the Cr(CO)(3) unit of the title compound, [Cr(C(17)H(14)O(4))(CO)(3)], is coordinated to the methoxy-phenyl ring of the isoflavone ligand; the Cr(CO)(3) unit exhibits a three-legged piano-stool conformation. The aromatic ring of the methoxy-phenyl group is twisted by 42.49 (9)° with respect to the γ-pyrone ring.

Tetra-kis(μ-4-ethyl-benzoato-κO:O')-bis-[(4-ethyl-benzoic acid-κO)copper(II)].

The molecule of the title compound, [Cu(2)(C(9)H(9)O(2))(4)(C(9)H(10)O(2))(2)], lies on a center of inversion. It consists of four bridging ethyl-benzoate ligands, forming a cage around two Cu atoms in a syn-syn configuration, and two monodentate ethyl-benzoic acid ligands bonded apically to the square-planar Cu atoms. The Cu⋯Cu distance is 2.

Tetra-kis(μ-2-methyl-benzoato)bis-[(2-methyl-benzoic acid)copper(II)].

In the title centrosymmetric dinuclear compound, [Cu(2)(C(8)H(7)O(2))(4)(C(8)H(8)O(2))(2)], four o-toluate anions form a cage around two Cu atoms in a syn-syn configuration. Two more o-toluic acid mol-ecules are apically bonded to the Cu atoms, which show a square-pyramidal coordination geometry. The acid H atoms are hydrogen bonded to the cage carboxyl O atoms [O⋯O = 2.

Redox glycosidation: the use of Nozaki-Takai methylenylation in a highly stereoselective synthesis of sucrose.

Sequential reaction of 2,3,4,6-tetra-O-benzyl-D-glucopyranose (7) with butyllithium and 2-[2,3,5-tri-O-benzyl-4-O-(tert-butyldiphenylsilyl)-D- arabinonoyl]thio-3-nitropyridine (6) at -78 degrees gave 2,3,4,6-tetra-O-benzyl-alpha-D-glucopyranosyl 2,3,5-tri-O-benzyl-4-O-(tert-butyldiphenylsilyl)-D-arabinonate+ ++ (8; 71%, alpha:beta greater than 50:1). Ester carbonyl methylenylation, desilylation, and iodoetherification in the presence of silica gave 3,4,6-tri-O-benzyl-1-deoxy-1-iodo-(2,3,4,6-tetra-O-benzyl-alpha-D- glucopyranosyl)-beta-D-fructofuranoside (15; 44%, alpha:beta greater than 50:1). This neopentylic iodide 15 was converted into sucrose (1;80%) by free-radical substitution using TEMPO (24) followed by sodium-ammonia reduction, acetylation, and Zemplén methanolysis.