Recently I am researching about SHORT-CHAIN DEHYDROGENASE/REDUCTASE; FLUORINATED PHOSPHONATES; ASYMMETRIC REDUCTION; KINETIC RESOLUTION; TRIFLUOROMETHYL KETONES; SUBSTITUENT CONSTANTS; BIOCATALYTIC CASCADE; CATALYZED HYDROLYSIS; AROMATIC-ALDEHYDES; BUILDING-BLOCKS, Saw an article supported by the National Science Foundation (NSF), Division of ChemistryNational Science Foundation (NSF) [CHE-1500076, CHE-1800574]; National Institutes of Health (NIH)United States Department of Health & Human ServicesNational Institutes of Health (NIH) – USA [SIG-1-510-RR-06307]; NSFNational Science Foundation (NSF) [CHE-0091975, MRI-0079750]; NIH, National Center for Research ResourcesUnited States Department of Health & Human ServicesNational Institutes of Health (NIH) – USANIH National Center for Research Resources (NCRR) [RR016544]. Published in GEORG THIEME VERLAG KG in STUTTGART ,Authors: Kudalkar, GP; Tiwari, VK; Lee, JD; Berkowitz, DB. The CAS is 100-19-6. Through research, I have a further understanding and discovery of 1-(4-Nitrophenyl)ethanone. Safety of 1-(4-Nitrophenyl)ethanone
Described is a physical organic study of the reduction of three sets of carbonyl compounds by the NADPH-dependent enzyme Clostridium acetobutylicum alcohol dehydrogenase (CaADH). Previous studies in our group have shown this enzyme to display broad substrate promiscuity, yet remarkable stereochemical fidelity, in the reduction of carbonyl compounds, including alpha-, beta- and gamma-keto esters ( d -stereochemistry), as well as alpha,alpha-difluorinated-beta-keto phosphonate esters ( l -stereochemistry). To better mechanistically characterize this promising dehydrogenase enzyme, we report here the results of a Hammett linear free-energy relationship (LFER) study across three distinct classes of carbonyl substrates; namely aryl aldehydes, aryl beta-keto esters and aryl trifluoromethyl ketones. Rates are measured by monitoring the decrease in NADPH fluorescence at 460 nm with time across a range of substrate concentrations for each member of each carbonyl compound class. The resulting v (0) versus [S] data are subjected to least-squares hyperbolic fitting to the Michaelis-Menton equation. Hammett plots of log( V (max) ) versus sigma (X) yield the following Hammett parameters: (i) for p -substituted aldehydes, rho = 0.99 +/- 0.10, rho = 0.40 +/- 0.09; two domains observed, (ii) for p -substituted beta-keto esters rho = 1.02 +/- 0.31, and (iii) for p -substituted aryl trifluoromethyl ketones rho = -0.97 +/- 0.12. The positive sign of rho indicated for the first two compound classes suggests that the hydride transfer from the nicotinamide cofactor is at least partially rate-limiting, whereas the negative sign of rho for the aryl trifluoromethyl ketone class suggests that dehydration of the ketone hydrate may be rate-limiting for this compound class. Consistent with this notion, examination of the (13) C NMR spectra for the set of p -substituted aryl trifluo-romethyl ketones in 2% aqueous DMSO reveals significant formation of the hydrate ( gem -diol) for this compound family, with compounds bearing the more electron-withdrawing groups showing greater degrees of hydration. This work also presents the first examples of the CaADH-mediated reduction of aryl trifluoromethyl ketones, and chiral HPLC analysis indicates that the parent compound alpha,alpha,alpha-trifluoroacetophenone is enzymatically reduced in 99% ee and 95% yield, providing the ( S )-stereoisomer, suggesting yet another compound class for which this enzyme displays high enantioselectivity.
Safety of 1-(4-Nitrophenyl)ethanone. About 1-(4-Nitrophenyl)ethanone, If you have any questions, you can contact Kudalkar, GP; Tiwari, VK; Lee, JD; Berkowitz, DB or concate me.
Reference:
Benzodioxan,
,1,4-Benzodioxane | C8H8O2 – PubChem