Studies on Sulfur-Containing Heterocyclic Compounds. III-IV. III. Structure of 3-Aminorhodanine

Mn(III)-initiated facile oxygenation of heterocyclic 1,3-dicarbonyl compounds.

The Mn(III)-initiated aerobic oxidation of heterocyclic 1,3-dicarbonyl compounds, such as 4-alkyl-1,2-diphenylpyrazolidine-3,5-diones, 1,3-dialkylpyrrolidine-2,4-diones, 3-alkyl-1,5-dimethylbarbituric acids, and 3-butyl-4-hydroxy-2-quinolinone gave excellent to good yields of the corresponding hydroperoxides, which were gradually degraded by exposure to the metal initiator after the reaction to...

Iii and Iv Structural Studies

The production, isolation and characterization of rancinamycins I, II, III and IV have been described in a preceding communication." These metabolites, which exhibit in vitro activity against Gram-positive and Gram-negative bacteria, are produced by Streptomyces lincolnensis in media depleted of sulfur-containing inorganic or organic compounds. Rancinamycins I, II, III and IV behaved as single ...

Studies of bromine-oxidizable sulfur-containing compounds in mold metabolism.

Quantum chemical characterization of the bonding of N-heterocyclic carbenes to Cp2MI compounds [M = Ce(III), U(III)].

The binding of N-heterocyclic carbenes to Ce(III) and U(III) compounds is characterized by quantum chemical methods. Density functional methods are in qualitative agreement with experiment that binding to U(III) is more favorable than to Ce(III); after correcting for basis-set superposition error, quantitative agreement with experiment is achieved with a multireference second-order perturbation...

A novel sensor based on a heterocyclic ionophore for cerium (III) analysis in real samples

A new polyvinyl choloride (PVC) membrane sensor for cerium (III) was prepared based on 4,13-didecyl-1,7,10,16-tetraoxa-4,13-diazacyclooctadecane (kryptofix22DD) as an ionophore. The sensor exhibites a linear concentration range of 1.0×10-6 to 1.0×10-1 M, with a Nernstian slope of 18.0±1.0 mV/decade, and a detection limit of 9.7×10-7 M. It has a fast response time (5 s) and can be used for two m...