A synthesis and some reactions of 2-thiocyanato-2-ethylenic carbonyl compounds

A synthesis of 2-thiocyanato-2-ethylenic carbonyl compounds was achieved by the reaction of epoxy ketones with Ph₃P(SCN)₂ (TPPT). Some useful transformations of 2-thiocyanato-2-cyclohexenone to 2,3-disubstituted cyclohexanones and iminothiazolines are described.     

Rapid separation of humic acid in fresh waters by coprecipitation and flotation

After removal of suspended matter in 1 liter of water by flotation with a cationic surfactant, humic acid at theg/l level is separated from fulvic acid by coprecipitation with milligram quantities of iron(III) hydroxide at pH 7 followed by flotation with anionic surfactants. The iron(III) hydroxide is dissolved in 2M hydrochloric acid, and the acid-insoluble humic acid is filtered off on an ultrafilter and then dissolved in 10 ml of 0.1M potassium hydroxide solution for measurements of absorption spectra, molecular weight distribution and complexing ability. The time required for the separation is ca. 1 h.     

PRELIMINARY STUDIES ON THE SYNTHESIS AND CHARACTERIZATION OF OXY-AND THIO-DIACETIC ACID HYDRAZITION AND THEIR FIRST-ROW TRANSITION METAL COMPLEXES

It has been made certain that thio-and oxy-diacetic acid hydrazidesare potential anticancer compounds.However,their ability to formcomplexes with transition metals and the properties of the complexes thusformed have not been studied.Employing a new potential anticancer ligand1,2-bis(thioacetic acid hydrazide)ethane prepared in our lab,along withligands oxydiacetic hydrazide and 1,2-bis(oxyacetic acid hydrazide)ethane,a series of 11 new first-row transition metal(M=Zn~(2+),Cu~(2+),Co~(2+),Ni~(2+))complexes with each of the above three ligands have been synthesizedand characterized by means of elemental analyses,IR,TG and X-raypowder diffraction.     

Spectral analysis for perturbed Laplace operators in cylindrical domains

The spectral theory for perturbed Laplace operators which are defined over cylindrical domains with bounded cross-sections is studied. The perturbation to be discussed here belongs to the so-called long-range class. First the following problems are considered: (i) discreteness of eigenvalues, (ii) absolute continuity of continuous spectrum, (iii) limiting absorption principle. Secondly the asymptotic behavior of solutions obtained by the limiting absorption method at infinity is discussed. These are generalizations of the results which have been obtained by many authors in the case of the short-range perturbation. Especially, the result concerning the asymptotic behavior includes a new one.     

Finite union of commutative power joined semigroups

A commutative semigroup is called power joined if for every element a, b there are positive integers m, n such that a^m=bⁿ. A commutative power joined semigroup is archimedean (p. 131, [3]) and cannot be decomposed into the disjoint union of more than one subsemigroup. Every commutative semigroup is uniquely decomposed into the disjoint union of power joined subsemigroups which are called the power joined components. This paper determines the structure of commutative archimedean semigroups which have a finite number of power joined components. The number of power joined components of commutative archimedean semigroups is one or three or infinity. The research for this paper was supported in part by NSF Grant GP-11964.     

Polymerization of vinylbenzamides

In the base-catalyzed polymerization of p-vinylbenzamide, hydrogen-transfer polymerization occurs. The structure of the new polymer was identified. Various effects on the hydrogen-transfer polymerization of p-vinylbenzamide were studied. The infrared spectrum of the oligomer has characteristic absorptions of secondary amide, as well as weak absorption of the vinyl group. The oligomer also gives a hydrogen-migrated polymer with anionic catalysts. From these facts a possible polymerization mechanism was proposed. The hydrogen-transfer polymerization occurred most readily with the p-vinylbenzamide, next and to a small extent with the meta-substituted isomer, and hardly with the o-substituted isomer. o-Vinylbenzamide gives 3,4-dihydroisocarbostyril.