Convergent routes to various classes of lactams exploiting the unique radical chemistry xanthates are described. Emphasis is placed on reactions leading by direct cyclization, intermolecular additions alkenes followed ring closure, and furnishing amino esters acids precursors that can be converted into ionic condensations. The possibility modifying existing lactam structures briefly discussed. ...

Xanthate is the most widely used and effective collector in flotation of sulfide minerals. However, residual xanthate wastewater may cause serious environmental pollution even human health hazards. At present, a variety treatment technologies have been developed to degrade pollutants wastewater, with aim meeting safe discharge standards. This work reviews research status recent years. Treatment...

1-[(Ethoxycarbonothioyl)sulfanyl]cyclobutyl acetate (xanthate 7) was found to add electronically unbiased alkenes and certain heteroarenes. In the latter case, this corresponds a variant of Minisci reaction allows late-stage modification biologically active substances. Saponification furnishes corresponding cyclobutanols, which, in case nicotine adduct, can be converted into fluorocyclobutanes ...

INHALATION of amyl nitrite causes abrupt vasodilatation and increase in cardiac output and intensifies the murmur of aortic stenosis.1 The transaortic systolic pressure gradient increases because of the increased ejection rate through the stenotic orifice. In muscular subaortic stenosis this effect is particularly marked,2-6 not only because of the increased ejection rate but also because the d...

The intermolecular hydrogen bonding interaction between p-chlorophenol and amyl acetate has been investigated by FT-IR spectroscopy. This article mainly reports the results of p-chlorophenol with carbon tetrachloride solution and in the presence of amyl acetate. The spectroscopic characteristics of OH....O complexes are specified. Also, the formation constant for 1:1 and 1:2 complexes at 25 C w...

Coalescence frequency and lifetimes of thin aqueous films formed between nitrogen bubbles were measured in dilute solutions of sodium lauryl suitate, «-amyl alcohol, and 1-butanol. The bubble pairs were formed on two adjacent capillary tubes by use of a microprocessor-controlled stepping motor, and the coalescence time was determined by an optical sensing method. For low-molecular weight alcoho...