Conclusions

1.

Anomalously high strength was found for the solvates of pyrocatechol with sulfoxides.

2.

Information was obtained on the mechanism for the extraction of pyrocatechol by sulfoxides and the extraction constant and formation constant of the extraction complex were calculated.

Conclusions

1.

Ambident arsenicβ-ketoylides are acylated by trifluoroacetic anhydride at the O atom of the carbonyl group to give diacyltriphenylarsinomethylenes.

2.

In contrast to their phosphorus analogs, the diacyltriphenylarsinomethylenes are cleaved by strong acids with rupture of either the CF₃CO-C bond or the As-C bond.

Conclusions

1.

Important reversible high-temperature chemisorption of h₂, where the degree is a function of the concentration of applied Re, the type of carrier and the starting Re(VII) compounds, is observed on Re catalysts reduced with H₂ at 500‡C. There are two regions of thermal desorption of H₂; I — 70–400‡C, and II — 500–800‡C. It is expedient to use the value of the desorption of form I for dispersion estimations.

2.

In hydrogenation of benzene, it was shown that the activity of applied Re reduced with H₂ at 500‡C is a function of the strength of the bond of the chemisorbed H₂ and is virtually not correlated with the value of the specific surface area of the metal.

It was Cuvier (1805) who complained about the pupils of Linné, who were more interested in sorting superficial characters of organisms for taxonomic purposes than in understanding them physiologically. There is no doubt that classification is an important step in the scientific process of defining an appropriate place within the natural system for any object, but reasoning should not halt at this point. Moreover, classifications have to be considered as preliminary unless based on sound functional and evolutionary reasoning (Bock, 1981).

Novel optical resolutions of guest compounds by inclusion complex formation with optically active host compound are reviewed. Tertiary acetylenic alcohols, cyanohydrins, and secondary alcohols were resolved by complexation with alkaloids such as brucine or sparteine. Cycloalkanones, 2,3-epoxycyclohexanones, and some other neutral compounds were resolved by complex formation with optically active diacetylenic diol. Mutual optical resolution of bis-β-naphthol and sulfoxides by complex formation was also reviewed.