51-81-0Relevant academic research and scientific papers
Selective and Additive-Free Hydrogenation of Nitroarenes Mediated by a DMSO-Tagged Molecular Cobalt Corrole Catalyst
Sch?fberger, Wolfgang,Timelthaler, Daniel,Topf, Christoph
supporting information, p. 2114 - 2120 (2021/07/22)
We report on the first cobalt corrole that effectively mediates the homogeneous hydrogenation of structurally diverse nitroarenes to afford the corresponding amines. The given catalyst is easily assembled prior to use from 4-tert-butylbenzaldehyde and pyrrole followed by metalation of the resulting corrole macrocycle with cobalt(II) acetate. The thus-prepared complex is self-contained in that the hydrogenation protocol is free from the requirement for adding any auxiliary reagent to elicit the catalytic activity of the applied metal complex. Moreover, a containment system is not required for the assembly of the hydrogenation reaction set-up as both the autoclave and the reaction vessels are readily charged under a regular laboratory atmosphere.
The ortho effect on the acidic and alkaline hydrolysis of substituted formanilides
Desai, Salil Dileep,Kirsch, Lee E.
, p. 471 - 488 (2015/06/30)
The kinetics of formanilides hydrolysis were determined under first-order conditions in hydrochloric acid (0.01-8 M, 20-60°C) and in hydroxide solutions (0.01-3 M, 25 and 40°C). Under acidic conditions, second-order specific acid catalytic constants were used to construct Hammett plots. The ortho effect was analyzed using the Fujita-Nishioka method. In alkaline solutions, hydrolysis displayed both first- and second-order dependence in the hydroxide concentration. The specific base catalytic constants were used to construct Hammett plots. Ortho effects were evaluated for the first-order dependence on the hydroxide concentration. Formanilide hydrolyzes in acidic solutions by specific acid catalysis, and the kinetic study results were consistent with the AAC2 mechanism. Ortho substitution led to a decrease in the rates of reaction due to steric inhibition of resonance, retardation due to steric bulk, and through space interactions. The primary hydrolytic pathway in alkaline solutions was consistent with a modified BAC2 mechanism. The Hammett plots for hydrolysis of meta- and para-substituted formanilides in 0.10 M sodium hydroxide solutions did not show substituent effects; however, ortho substitution led to a decrease in rate constants proportional to the steric bulk of the substituent.
COMPOUNDS AND METHODS FOR THE TREATMENT OF VIRUSES AND CANCER
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Page/Page column 45, (2010/11/26)
The present invention relates to compounds according to the formula I: Where Ra is H or an optionally OH-substituted C1-C3 alkyl; R1 is OR1, an optionally substituted C4-12 carbocyclic group which may be saturated or unsaturated (including aromatic) or an optionally substituted heterocyclic group; R1 is an optionally substituted C1-C14 hydrocarbyl group or an optionally substituted heterocyclic group;; R2 , R3 and R4 are each independently H, an optionally substituted C1-C4 alkyl group (preferably CH3, CH2CH3 or CF3), halogen (preferably F, Cl, Br), OR, CN, NO2, a C1-C6 thioether, a C1-C6 thioester group, an optionally substituted CO2R group, an optionally substituted COR group or an optionally substituted OCOR group (preferably R4 is H); R is H or an optionally substituted C1-C6 alkyl group; RHET is an optionally substituted heterocyclic group; and pharmaceutically acceptable salts, solvates or polymorphs thereof.
