The O-alkylation of carboxylic acids with diazo compounds provides a means to esterify carboxylic acids in aqueous solution. A Hammett analysis of the reactivity of diazo compounds derived from phenylglycinamide revealed that the (p-methylphenyl)glycinamide scaffold has an especially high reaction rate and ester/alcohol product ratio and esterifies protein carboxyl groups more efficiently than ...

A Rh2(OAc)4-catalyzed diazo decomposition reaction of diazo esters with 2-aminophenyl ketones is reported. A series of 3-hydroxy-2,2,3-trisubstituted indolines are produced in good yields with excellent diastereoselectivities via an intramolecular aldol-type trapping of ammonium ylides with ketone units.

It has long been recognized that, with p-diazobenzenesulfonic acid (van den Bergh reagent), bilirubin in serum of patients with jaundice may exhibit two types of reaction (1, 2). If coupling with the diazo reagent occurs promptly in aqueous solution, the reaction is said to be “direct;” if, however, coupling t.akes place only after prior addition of alcohol, the reaction is said to be “indirect...

It has long been recognized that, with p-diazobenzenesulfonic acid (van den Bergh reagent), bilirubin in serum of patients with jaundice may exhibit two types of reaction (1, 2). If coupling with the diazo reagent occurs promptly in aqueous solution, the reaction is said to be “direct;” if, however, coupling t.akes place only after prior addition of alcohol, the reaction is said to be “indirect...

OBJECTIVE Microbial translocation (MT) is thought to be a major contributor to the pathogenesis of HIV-related immune activation, and circulating lipopolysaccharide (LPS) from gram-negative bacteria is the principle measurement of this process. However, related research has been impeded by inconsistent LPS test results. METHODS Specimens were obtained from HIV-infected adults enrolled in the ...

Abstract The rational design based on a deep understanding of the present reaction mechanism is an important, viable approach to discover new organic transformations. β -Hydrogen elimination from palladium complexes fundamental in catalysis. Normally, eliminated β- hydrogen has be attached sp 3 -carbon. We envision that 2 -carbon possible by using thoroughly designed systems, which may offer st...

Time-resolved (CW) EPR spectroscopy at X-band has been used to detect free radicals created by H-atom abstraction reactions of photochemically generated carbenes in n-hexadecane solutions at room temperature. Three different carbenes were studied, formed via loss of nitrogen after photo-excitation of a substituted biphenyl diazo precursor. The TREPR signals from two different alkyl radicals and...

Rh(III)-catalyzed regioselective alkylation of indoles with diazo compounds as a highly efficient and atom-economic protocol for the synthesis of alkyl substituted indoles has been developed. The reaction could proceed under mild conditions and afford a series of desired products in good to excellent yields.

We have applied a color-developing reagent, p-nitrobenzene diazonium fluoroborate (diazo reagent) as a post-column derivatization tool for the specific determination of acetoacetate (AcAc) in high performance liquid chromatography (HPLC). A mobile phase consisting of 50 mM KH(2)PO(4), 4 mM tetra-n-butylammonium phosphate (TBAP) as an ion-pair reagent and 2 v/v% methanol, pH 3.5, diazo reagent s...