2.4- Dinitro-6- phenyl carbonate

However, in some cases azines can be converted to hydrazones by treatment with excess hydrazine and NaOH.202 Arylhydrazines, especially phenyl, p-nitrophenyl, and 2.4-dinitro-phenyl,203 are used much more often and give the corresponding hydrazones with most aldehydes and ketones.204 Since these are usually solids, they make excellent derivatives and are commonly employed for this purpose. a-Hydroxy aldehydes and ketones and a-dicar-bonyl compounds give osazones, in which two adjacent carbons have carbon-nitrogen double bonds ... 

Of the carboxylic acid esters the most important are isopropyl 2-i-butyl-4,6-dinitrophenyl carbonate (dinobuton, 8), methyl 2,4-dinitro-6-(l-ethylhexyl)phenyl carbonate (9a) and methyl 2,4-dinitro-6-(l-propylpentyl)phenyl carbonate (9b). The mixture of the two latter compounds has been introduced under the name dinocton-6 (9) (Pianka and Polton, 1963 Pianka and Smith, 1965). 

The log k values were correlated with two other sets of data. When plotted against the log k for reaction of the [(p-dimethylamino)-phenyl]tropylium ion with nucleophiles, two approximately parallel lines, one for reactions in MeOH and one for reactions with water, were obtained. A plot of log k for the reaction of 9 versus log k for the reaction of 2,4-dinitro-phenyl acetate with several nucleophiles was linear thus, similarities existed in the transition states for nucleophilic attack on activated vinylic and aromatic carbon. 

The presence of asymmetric carbons in selenomethionine, other a-selenoamino acids, and related compounds produces different chiral enantiomers with different physiological activities. HPLC separation of enantiomers is possible with a range of chiral stationary phases, d- and 1-Selenomethionine enantiomers have been resolved with an a-cyclodextrin stationary phase and other species with a teicoplanin-based chiral phase. Hybrid chiral methodologies based on GC, HPLC, and capillary electrophoresis, coupled with ICP-MS are feasible. Enantiomers of d,l-selenocystine, d,l-selenomethio-nine, and d,l-selenoethionine were examined in a range of commercial dietary supplements using a chiral crown ether stationary phase and ICP-MS detection. Selenium-em-iched onion, garlic, and yeast were analyzed and some of the selenoamino acid enantiomers were identified. l-Fluoro-2, 4-dinitro-phenyl-5-l-alanine amide was used to derivatize enantiomers of selenoamides for enhanced resolution. 

Dinocton is the isomeric mixture of 2,4-dinitro-6-octylphenyl methyl carbonate and 2,6-dinitro-4-octylphenyl methyl carbonate, in which the octyl group may be present in the form of 3 isomers, as for dinocap. In general, two active substances are present, one being dinocton-4, which is a mixture of mainly 2,6-dinitro-4-(l-ethylhexyOphenyl methyl carbonate (32) and 2,6-dinitro-4-(l-propylpentyl)phenyl methyl carbonate (33), with an acute oral value of460 mg/kg and a fungicidal... 

Primary alkyl phenyl tellurides undergo elimination to form terminal olefins in high yields on treatment with an excess of iV-chloro-iV-sodio-4-methyl-benzenesulphonamide (chloramine-T) in refluxing THF/ ufc-Dinitro compounds and /3-nitrosulphones are converted into olefins via free-radical elimination processes on treatment with tributyltin hydride in the presence of catalytic quantities of azobis(isobutyronitrile) (AIBN). Elimination from the dinitro compounds shows no stereocontrol by contrast, elimination from /3-nitrosulphones is highly stereoselective, e.g. (26)- (27), presumably because elimination from the intermediate radical is faster than rotation about the central carbon-carbon bond. 

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