INTRODUCTION BRACHET'S (1950) strong emphasis on the role of—SH-containing proteins in the process of induction has stimulated a study of the interference in the normal process of morphogenesis of chick embryos by chloroacetophenone, which has been described by Beatty (1951) as a specific and irreversible —SH inhibitor. He studied the effect of chloroacetophenone on the development of embryos o...

Quaternary salts of pyridoxal oxime have been synthesized by the quaternization of pyridoxal oxime with substituted phenacyl bromides using microwave heating. Microwave-assisted rapid synthesis was done both in solvent (acetone) and under solvent-free conditions. Good to excellent yields (58%-94%) were obtained in acetone in very short reaction times (3-5 min) as well as in the solvent-free pro...

Investigations of the inhibition of the activity of xanthine oxidase in vitro have yielded a number of substances which have been reported to exert marked inhibitory actions at low concentrations. Among these are p-aminophenol in its oxidized form (l), pyrogallol (a), bromoacetophenone (3)) 6-pteridylaldehyde (4)) and 6-hydroxymethylpterin (5). An examination of the structures of these compound...

A convenient one-pot reaction was conducted by mixing bromoacetophenone, a functionalized α,β-unsaturated ketone and potassium hydroxide in tetrahydrofuran at room temperature, ammonium acetate was added and heated to reflux, resulting in four chemical bonds forming from easily accessible substrates. This process provides a flexible and rapid synthetic route for the construction of polysubstitu...

Bovine pancreatic phospholipase A2 covalently inhibited by p-bromo-phenacyl-bromide was crystallized from 50% (v/v) 2-methyl-2,4-pentanediol. The space group was P3(1)21 with cell dimensions a = b = 46.73 A and c = 102.5 A (1 A = 0.1 nm). Diffraction data were collected by oscillation photography from one single crystal of dimensions 0.2 mm x 0.2 mm x 0.2 mm. The crystal structure was determine...

Although large peptides are now being synthesized by recombinant DNA technology, chemical synthesis remains important for clarifying their chemical and biological properties. In 1969, two notable reports were published on the chemical synthesis of enzymes: one described solid-phase synthesis of ribonuclease A by Gutte & Merrifield [ 1, 21; and the other, solution synthesis of ribonuclease S-pro...