منابع مشابه
Hexaaquacobalt(II) 2,2′-[naphthalene-1,8-diylbis(oxy)]diacetate dihydrate
In the title compound, [Co(H(2)O)(6)](C(14)H(10)O(6))·2H(2)O, the 2,2'-[naphthalene-1,8-diylbis(-oxy)]diacetate dianion L is not coordinated to the Co(II) ion. The asymmetric unit contains half of the L dianion, half of a [Co(H(2)O)(6)](2+) cation (both molecules being completed by inversion symmetry), and one water mol-ecule. The crystal packing features O-H⋯O hydrogen bonding between the carb...
متن کاملOrganocatalytic asymmetric oxy-Michael addition to a γ-hydroxy-α,β-unsaturated thioester via hemiacetal intermediates.
We report an asymmetric oxy-Michael addition to a γ-hydroxy-α,β-unsaturated thioester via hemiacetal intermediates in the presence of Cinchona-alkaloid-thiourea-based bifunctional organocatalysts. This method provides a novel enantioselective route to β-hydroxy carboxyl compounds, which in turn can be used to synthesize valuable chiral building blocks.
متن کاملYeast aldehyde dehydrogenase. II. Properties of the homogeneous enzyme preparations.
Homogeneous preparations of the potassium-requiring yeast aldehyde dehydrogenase are active with either DPN or TPN in the oxidation of a wide variety of aldehydes. Exogenous mercaptan is not a requirement for catalytic activity. The enzyme is denatured in 6 M guanidine hydrochloride to form a protein species with a molecular weight somewhat greater than 21,000. The denatured protein may be reas...
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A general catalytic oxo-hetero-Diels-Alder reaction for pro-chiral aldehyde and ketone N-oxy-pyridines is presented. The catalytic and asymmetric oxo-hetero-Diels-Alder reaction of electron-rich dienes with N-oxy-pyridine-2-carbaldehyde and ketone derivatives, catalyzed by chiral copper(II)-bisoxazoline complexes, gives optically active six-membered oxygen heterocycles in moderate to good yield...
متن کاملCovalent Immobilization of Bacillus licheniformis γ-Glutamyl Transpeptidase on Aldehyde-Functionalized Magnetic Nanoparticles
This work presents the synthesis and use of surface-modified iron oxide nanoparticles for the covalent immobilization of Bacillus licheniformis γ-glutamyl transpeptidase (BlGGT). Magnetic nanoparticles were prepared by an alkaline solution of divalent and trivalent iron ions, and they were subsequently treated with 3-aminopropyltriethoxysilane (APES) to obtain the aminosilane-coated nanoparticl...
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ژورنال
عنوان ژورنال: Berichte der deutschen chemischen Gesellschaft (A and B Series)
سال: 1919
ISSN: 0365-9488
DOI: 10.1002/cber.19190520903