Chloro-Fluoro Carbons (CFC), also known as Refrigerants or Propellants, are highly volatile compounds which can be analyzed via gas chromatography. There production, application and especially release is controlled carefully as they have a direct impact on the ozone layer. For the separation via GC, we meet some challenges as due to their volatility, a stationary phase is required with very hig...

234 CLINICAL CHEMISTRY, Vol. 32, No. 1, 1986 basic chemical principles. Reviewing uric acid methodology, we discovered one incorrect and two unbalanced reaction equations for uric acid analysis by the uricas&peroxidase-phenol-4-aminoantipyrine method. Figure 1 illustrates the overall reaction. An investigator has incorrectly prothe formation of a dichloro-oquinoneimine dye from the reaction bet...

Two unique chloro-pregnane steroids have been isolated from the eastern Pacific octocoral Carijoa multiflora and their structures and stereochemistries were determined on the basis of spectral studies and molecular mechanics calculations. © 2003 Elsevier Ltd. All rights reserved. Pregnane steroids and their glycosides are rare in the marine environment and, ahhough the first pregnane derivative...

The microsomal fraction from the mesocarp of avocado (Persea americana) is one of few identified rich sources of plant cytochrome P-450. Cytochrome P-450 from this tissue has been solubilized and purified. Enzymatic assays (p-chloro-N-methylaniline demethylase) and spectroscopic observations of substrate binding suggest a low spin form of the cytochrome, resembling that in the microsomal membra...

The crystal structures of (3S,4aS,8aS)-2-[(2R,3S)-3-benzamido-2-benzo-yloxy-4-phenyl-but-yl]-N-tert-butyldeca-hydro-iso-quinoline-3-carboxamide, C38H47N3O4, (I), and (3S,4aS,8aS)-2-[(2R,3S)-3-(2,5-di-chloro-benzamido)-2-(2,5-di-chloro-benzo-yloxy)-4-phenyl-but-yl]-N-tert-butyldeca-hydro-iso-quinoline-3-carboxamide, C38H43Cl4N3O4, (II), are described. Despite their chemical similarity, they adop...

There are two independent mol-ecules (A and B) in the asymmetric unit of the title compound, C14H12ClNO3. The mean planes of the methyl ester unit (Cmeth-yl-O-C=O; r.m.s. deviation = 0.051 Å for mol-ecule A and 0.016 Å for mol-ecule B) and the chloro-quilonine ring system (r.m.s. deviation = 0.023 Å for mol-ecule A and 0.014 Å for mol-ecule B) form dihedral angles of 63.5 (1)° in mol-ecule A an...

Abstract Background Pharmacotherapy for most psychiatric conditions was developed from serendipitous observations of benefit drugs prescribed different reasons. An algorithmic approach to formulating pharmacotherapy is proposed, based upon which combination changed activities by brain cell-types dominant any particular condition, because those contain and surrogate genetic, metabolic environmen...

The title compound (systematic name: 1-{3,5-di-chloro-4-[3-chloro-5-(tri-fluoro-meth-yl)pyridin-2-yl-oxy]phen-yl}-3-(2,6-difluoro-benzo-yl)urea), C20H9Cl3F5N3O3, is a benzoyl-phenyl-urea insecticide. The dihedral angles between the planes of the central di-chloro-phenyl and the terminal di-fluoro-phenyl and chloro-pyridyl rings are 79.51 (6) and 78.84 6)°, respectively. In the crystal, pairs of...