Antonio Maccioni

Catalytic activity of cyclophosphazenic polypodands in phase-transfer reactions. Comparison with open-chain analogues.

Abstract The catalytic activity of cyclophosphazenic polypodands 1a-c was evaluated in typical reactions performed under solid-liquid (SL) and liquid-liquid (LL) phase-transfer catalysis (PTC) conditions. Such activity is largely determined by the complexation extent of 1a-c which is in turn related to the number of binding sites of the ligand (1a K+2>Rb+ and SCN−∼I−> Br−). Also the presence of water was found to play an important role. Comparison with open-chainanalogues PEG 2 and TRIDENT 3 showed that polypodands 1a-c due to their excellent stability simplicity of preparation and high complexing ability can be considered promising phase transfer catalysts especially under SL-PTC conditions. Cyclophosphazenic polypodands are efficient catalysts in anion promoted reactions (e.g. nucleophilic substitution, alkylation, reduction, oxidation reactions) under SL and LL-PTC conditions. Catalytic activity is mainly related to their complexation capability.

Structural studies on 1,2-oxazines derived from 3-methylcyclohexanone

Abstract The molecular structures of two isomeric l,2-oxazies obtained by reaction of phenacyl bromide oxime with morpholine enamine of 3-methyl-cyclohexanone have been determined by spectroscopic and diffractometric techniques. The oxazines result to be two diastereoisomers with cis fused ring conformation deriving from the Δ6 enamine isomer.

Paramagnetic intermediates in the thermal reactions of benzo[2,1-b;3,4-b′]dithiophen-4,5-dione with some metal(III) compounds of the heavier group VB elements

The paramagnetic adducts resulting from the thermal reaction between benzo[2,1-b;3,4-b′]dithiophen-4,5-dione and some organometallic derivatives of arsenic, antimony, and bismuth have been investigated by e.s.r. spectroscopy. From the e.s.r. data two alternative structural situations can be envisaged for these radicals, which in principle can be depicted either as species containing a four-co-ordinated metal atom (I), or as the average of a rapid equilibrium between two equivalent three-co-ordinate tautomers (la and b).

Pavel A. Florenskij. Organization of Space, Art, Culture as Unity

In the early decades of the 20th century, the reflection about the deyatel’ kul’tury is one of the most important chapters of the russian philosophy: the conception of space and time proposed by Pavel A. Florenskij – as his result in the teatrise Analiz prostranstvennosti i vremeni – is a relevant part of it. Science, philosophy and art find their roots in life, and the study of the space is the start to understand themselves. Deyatel’ kul’tury , according Florenskij, does culture: he assumes the task of planting border’s poles, outlining the shortest paths through a system of isopotential lines. Through references to the debate between Symbolists, in the Analiz we can read in a new way the origin of sculpture, theatre, cinema, paint, poetry: the organization of the space can reach man’s consciousness, but the space already exists, as exists the life itself in which the art has its roots.