Synthesis of nem paramagnetic retinal analogues

New paramagnetic retinal analogues have been synthesized by Horner-Wadsworth-Emmons and Wittig reactions. In these new analogues the pyrroline nitroxide moiety is situated in the place of Beta-ionone ring or at the end of the polyene chain

Synthesis of Azoles Condensed with, or Linked to, Nitroxides

Nitroxides connected to indoles, tetrazoles, or 1,3,4-oxadiazoles were synthesized by conventional and microwave-assisted cyclization reactions. New approaches to pyrrole-, pyrazole-, and triazoleannulated nitroxides are described. We showed that Diels–Alder reactions of the N-tert-butoxycarbonyl derivative of (4,4,6,6-tetramethyl- 2,4,6,7-tetrahydro-5H-pyrrolo[3,4-c]pyridin-5-yl)oxidanyl gave polycyclic scaffolds condensed with a six-membered nitroxide

Micromorphological investigations on two paleosol horizons of the loess/paleosol sequence of Madaras, Hungary

Abstract The loess/paleosol sequence near the village of Madaras is an outstanding record of Late Quaternary paleoenvironmental and paleoclimatic changes in Hungary and the entire Carpathian Basin. The present study highlights the results of preliminary micromorphological investigations implemented on 24 samples taken from two pre-selected pedogenized horizons of the sequence. Our work yielded interesting results regarding the evolutionary history and modes of pedogenesis in the studied section

SYNTHESIS OF NEW PYRROLINE NITROXIDES WITH ETHYNYL FUNCTIONAL GROUP

3-Substituted and 3,4-disubstituted pyrroline nitroxides containing an ethynyl group or two ethynyl groups were achieved by the reaction of a paramagnetic aldehydes with dimethyl (1-diazo-2-oxopropyl)phosphonate (Bestmann–Ohira reagent). The new compounds containing an ethynyl group were found to be useful building blocks in Sonogashira coupling, cyclization, and cycloaddition reactions producing potentially “azido-specific” cross-linking spin labels, paramagnetic ligands, and polyradical scaffold

Aphanes arvensis L. a Crisicumban és más adatok Magyarország flórájának ismeretéhez

A közleményben 4 ritka növényfaj kelet-magyarországi előfordulásairól számolunk be. A fajok egyes flórajárásokra vagy flóravidékekre újnak számítanak: Alföld (Eupannonicum): Polystichum braunii; Tiszántúl (Crisicum): Aphanes arvensis; Észak-Alföld (Samicum) és Nyírség (Nyírségense): Agrimonia procera. A jövevény Montia linearis előfordulásához három új adatot közlünk Magyarországról. Ez a faj még mindig nagyon ritka Európában: csak Lengyelországból, Dániából és Magyarországról jelezték.</jats:p