The 2-oxa-5-adamantyl carbocation 4 is shown to be a viable intermediate in several S(N)1 substitution reactions. However, attempts to observe the formation of 4 from various precursors by NMR methods (which succeed for the 1-adamantyl cation 5) failed, suggesting that 4 does not survive on longer timescales. DFT calculations suggest that the retro-Prins process (beta-cleavage, Grob fragmentati...

The present paper is aimed at solving initial value problems by the contraction-mapping principle in case an interior estimate is true in the function space under consideration. reziume. naSr omis mizania saCKisi amocanis kumSviTi asaxvis prin-cipiT amoxsna im SemT xvevaSi, roca gansaxil vel sivr ceSi samar Tl iania pirvel i rigis Carmoebu l ebis SePaseba gansazG vr is aris SigniT mo-Tavsebu l ...

A sustainable and simple Au(I) catalytic system to synthesise 8-oxabicyclo[3.2.1]oct-2-enes and 9-oxabicyclo[3.3.1]nona-2,6-dienes from enynol via oxonium/Prins-type cyclization is described. The key advantages of this reaction are selectivity, good functional group tolerance and a new approach for synthesis of oxabicyclic and oxatricyclic systems.

The formal synthesis of (+)-SCH 351448 has been accomplished with the catalytic Prins cyclization strategy, yielding the monomeric unit as a single isomer.

An acetal-initiated Prins bicyclization approach has been developed for the stereoselective synthesis of hexahydrofuro[3,4-c]furan lignans. This also provides a direct way to generate a new series of octahydropyrano[3,4-c]pyran derivatives in a single-step process.

Această lucrare descrie tehnici specializate de extragere a modelelor nominale şi parametrice pentru interconexiunile lungi descompuse în linii drepte, modelate ca linii de transmisie şi în componente de joncţiune, modelate ca dispozitive pasive. Un pas important în modelare este extragerea parametrilor lineici pentru linia de transmisie. Este prezentată o nouă abordare pentru calculul conducta...

C. A. Azlan, P. Di Giovanni, T. S. Ahearn, W. M. Prins, M. Clemence, S. I. Semple, F. J. Gilbert, and T. W. Redpath Aberdeen Biomedical Imaging Centre, University of Aberdeen, Aberdeen, Scotland, United Kingdom, Department of Biomedical Imaging, University of Malaya, Kuala Lumpur, Malaysia, Philips Healthcare, Best, Netherlands, Philips Healthcare, Reigate, England, United Kingdom, Department o...

Current literature accepts 17 species in Penicillium section Sclerotiora. Several produce colonies in bright yellow to orange colours and have monoverticillate conidiophores, apart from P. herquei, P. malachiteum and P. nodositatum, which are biverticillate. The focus of this paper is to refine the concepts of the species currently accepted in the section and introduce five new species, named a...

An intramolecular Prins macrocyclization reaction was successfully employed in the synthesis of polycavernoside A.

This article summarizes the main results of a research conducted by the University of Bologna, Department of Architecture, within the framework of the Research Program PRIN 2008, «Renovation, regeneration and valorisation of social housing settlements built in the suburban areas in the second half of last century». Once quantified the residential stock, a methodology for multidisciplinary analy...