Catalytic utilization of converter gas – an industrial waste for the synthesis of pharmaceuticals

From waste to value. An efficient and convenient ruthenium-catalyzed reduction of aromatic nitro compounds using converter gas as a reducing agent to produce valuable pharmaceuticals has been developed.

Crystal structure of 4,8-di-tert-butyl-6,6-dichloro-13-ethyl-2,10-dimethyl-13,14-dihydro-12H-dibenzo[d,i][1,3,7,2]dioxazasilecine toluene 0.25-solvate

The coordination polyhedron at the silicon atom in the title compound, C26H37Cl2NO2Si·0.25C7H8, is typical for pentacoordinated silicon derivatives and represents a slightly distorted trigonal bipyramid with an N atom and a Cl atom in the apical positions and the two O atoms and the other Cl atom occupying the equatorial sites. There are two independent molecules in the asymmetric unit. The N–Si–Cl fragment in each is close to linear [178.24 (5) and 178.71 (5)°], in good agreement with 4e–3ctheory, as is the elongation of the apical bond lengths [Si—Cl = 2.1663 (7) and 2.1797 (7) Å] in comparison with the equatorial bonds [Si—Cl = 2.0784 (7) and 2.0748 (7) Å]. Orthogonal least-squares fitting of the two independent molecules resulted in r.m.s. deviation of 0.017 Å. The conformations of the two molecules are almost the same, with corresponding torsion angles differing by less than 5.5°. The toluene solvent molecule is disordered about an inversion centre.

Aluminum complexes based on pyridine substituted alcohols: synthesis, structure, and catalytic application in ROP

2,6-Bis(hydroxyalkyl)pyridines were used in the synthesis of Al complexes. The structure of the ligand determines the complex nature. Compounds were used as initiators of lactone ROP.

{2,2'-[Ethane-1,2-diylbis(nitrilo-methan-yl-yl-idene)]diphenolato}(iso-propano-lato)aluminium di-chloro-methane hemisolvate

In the title compound, [Al(C16H14N2O2)(C3H7O)]·0.5CH2Cl2, the salen complex is monomeric and the dichlormethane solvent mol-ecule lies on a crystallographic twofold axis. The central Al atom is fivefold coordinated and possesses a square-based pyramidal environment. The Al-OAlk( (i) prop-yl) bond [1.7404 (14) Å] is much shorter than the Al-OAr(salen) bond lengths [1.7974 (15) and 1.8094 (14) Å]. The iso-propyl-oxo group forms an intra-molecular C-H⋯N hydrogen bond. In the crystal, the complex mol-ecules are linked by weak C-H⋯O inter-actions.

[Ambulatory transesophageal cardiac electrostimulation and daily Holter cardiac monitoring of patients with a heart rhythm disorder]

Sixty-eight patients with different disorders of the cardiac rhythm were examined in ambulatory conditions. The complex of noninvasive examinations included: echocardiography, Holter monitoring, bicycle ergometry [correction of veloergometry] and transesophageal cardiostimulation with performance of diagnostic and pharmacological tests. The obtained data permitted to evaluate disorders of automatism and conduction at different levels of the cardiac conduction system, to identify paroxysmal tachyarrhythmia and realize selection of antiarrhythmic agents.