37、 is of interest to note that no racemization occurs in the reduction of amino acids using NaBH4I2or NaBH4 H2SO4. (34) 5. Reduction of carboxylic acid esters The NaBH4ZnCl2reagent system exhibits powerful reducing properties in the presence of a tertiary amine. The carboxylic esters were ...
LA Highbarger,JA Gerlt,GL Kenyon - 《Biochemistry》 被引量: 241发表: 1996年 Development of silver nanoparticle loaded antibacterial polymer mesh using plasma polymerization process Plasma polymerized polyacrylic acid (PPAA) was deposited on a polymer substrate, namely polyethylene terephthalate (PET) me...
The addition is followed byprotonationof the oxygen with a mild acid (leading to the formation of O–H). In practice, this reaction is usually performed in an alcoholic solvent like CH3OH and the reaction is quenched with a mild acid such as a saturated solution of ammonium chloride (NH4Cl...
The epoxides are easily obtained in up to 95% ee through routine acid–base workup of the product alcohols. Either the ( R) or ( S) epoxide can be obtained by using the appropriate l- or d-tartaric acid starting material in the TarB-NO 2 reagent....
The initiator system used generally comprises a Lewis acid and an “inifer”, i.e. an organic compound having an easily displaceable leaving group which forms a carbocation or a cationic complex with the Lewis acid. The inifer is generally a tertiary halide, a tertiary ester or ether or a...
Membranes from the acid-base complexes group are a promising alternative as they have been shown to be competitive to Nafion ones in terms of simplicity and cost of preparation. In this study, cation- and anion-exchange membranes will be tested as separators in DBPFCs. The performance of ...
[62]) is in great need for the recycling of the hydrogen supply system of NaBH4: NaBH4 + xH2O → H2 + NaBO2·xH2O, (x = 2, 4) (1) According to this, the Brown-Schlesinger process was modified using NaBO2 as source of boric acid to synthesis of NaBH4 [63], the drawback of ...
The product spots were visualized with a solution of phosphomolybdic acid (PMA), p-anisaldehyde, iodine (I2), or cerium ammonium molybdate (CAM). Preparative TLC (pTLC) was performed on Merck PLC Silica gel 60 F254, 0.5 mm. Flash silica-gel column chromatography (SiO2-chromatography) ...
Decades ago, the Wolfrom method [1] was reported, which employs hydriodic acid as the reducing agent and then a protocol involving catalytic amounts of diethyl peroxydicarbonate in isopropanol [2]. The interesting transformation of α-diazo-β-hydroxy esters into β-keto esters [3,4] catalyzed ...