TY - JOUR AU - Hell, Zoltán AU - Korecz, László AU - Békássy, Sándor TI - Spectroscopic Evidence for the Involvement of a Radical Intermediate in the Friedel-Crafts Benzylation Using Ion-Exchanged K10 Catalysts JF - PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING J2 - PERIOD POLYTECH CHEM ENG VL - 62 PY - 2018 IS - 4 SP - 497 EP - 502 PG - 6 SN - 0324-5853 DO - 10.3311/PPch.12842 UR - https://m2.mtmt.hu/api/publication/30326257 ID - 30326257 N1 - Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, P. O. Box 91, Budapest, H-1521, Hungary Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, Budapest, 1117, Hungary Cited By :1 Export Date: 23 May 2021 Correspondence Address: Hell, Z.; Department of Organic Chemistry and Technology, P. O. Box 91, Hungary; email: zhell@mail.bme.hu LA - English DB - MTMT ER - TY - JOUR AU - Bánvölgyi, Szilvia AU - Bahceci, KS AU - Vatai, Gyula AU - Békássy, Sándor AU - Békássyné Molnár, Erika TI - Partial dealcoholization of red wine by nanofiltration and its effect on anthocyanin and resveratrol levels JF - FOOD SCIENCE AND TECHNOLOGY INTERNATIONAL J2 - FOOD SCI TECHNOL INT VL - 22 PY - 2016 IS - 8 SP - 677 EP - 687 PG - 11 SN - 1082-0132 DO - 10.1177/1082013216642331 UR - https://m2.mtmt.hu/api/publication/3160780 ID - 3160780 N1 - Department of Food Engineering, Faculty of Food Science, Szent István University, Budapest, Hungary Department of Food Engineering, Faculty of Engineering, Hitit University, Çorum, Turkey Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary Cited By :8 Export Date: 8 April 2021 Correspondence Address: Savaş Bahçeci, K.; Hitit University, Turkey; email: ksavasbahceci@hitit.edu.tr Chemicals/CAS: resveratrol, 501-36-0; Alcohols; Anthocyanins; resveratrol; Stilbenes Department of Food Engineering, Faculty of Food Science, Szent István University, Budapest, Hungary Department of Food Engineering, Faculty of Engineering, Hitit University, Çorum, Turkey Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary Cited By :8 Export Date: 13 April 2021 Correspondence Address: Savaş Bahçeci, K.; Hitit University, Turkey; email: ksavasbahceci@hitit.edu.tr Chemicals/CAS: resveratrol, 501-36-0; Alcohols; Anthocyanins; resveratrol; Stilbenes Department of Food Engineering, Faculty of Food Science, Szent István University, Budapest, Hungary Department of Food Engineering, Faculty of Engineering, Hitit University, Çorum, Turkey Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary Cited By :8 Export Date: 20 April 2021 Correspondence Address: Savaş Bahçeci, K.; Hitit University, Turkey; email: ksavasbahceci@hitit.edu.tr Chemicals/CAS: resveratrol, 501-36-0; Alcohols; Anthocyanins; resveratrol; Stilbenes AB - The present work studies the use of nanofiltration for the production of red wine concentrate with low alcohol content. Factorial design was applied to measure the influences of transmembrane pressure (10-20 bar) and temperature (20-40?) on the retention of valuable components such as anthocyanins and resveratrol, and on the nanofiltration membrane performance. The highest retention of anthocyanin and resveratrol was achieved at low temperature (20?), while the high transmembrane pressure (20 bar) was found to increase the permeate flux considerably. The experiments demonstrated that nanofiltration appears as a valid technique for the production of low alcohol content red wine concentrate. Reduction of volume by a factor of 4, leads to 2.5-3 times more anthocyanins and resveratrol in the wine concentrates. The final new wine products - obtained by using various forms of reconstitution of the concentrated wine - had low alcohol content (4-6 % by volume) and their sensory attributes were similar to those of the original wine. LA - English DB - MTMT ER - TY - JOUR AU - Békássy, Sándor AU - Agai, B AU - Farkas, J AU - Gabor, E AU - Ferenczi, M AU - Figueras, F TI - An environmentally friendly route for the synthesis of benzofurane derivatives using selective ring acylation of resorcinol JF - CATALYSIS LETTERS J2 - CATAL LETT VL - 118 PY - 2007 IS - 3-4 SP - 219 EP - 223 PG - 5 SN - 1011-372X DO - 10.1007/s10562-007-9173-y UR - https://m2.mtmt.hu/api/publication/2649962 ID - 2649962 AB - The synthesis of 2,2-dimethyl-2,3-dihydro-benzofuran-6-ol, an important intermediate for benzofurane derivatives having pharmaceutical activity, is achieved by an environmentally friendly pathway. Whereas the current synthesis method, based on resorcinol dimethylether, uses or produces harmful, corrosive and dangerous reagents/materials, the procedure proposed here achieves 60% preparative yield for the selective direct ring acylation of resorcinol with isobutyryl chloride, using a solvent-free reaction catalysed by solid acids. LA - English DB - MTMT ER - TY - GEN AU - Békássy, Sándor TI - Applications des catalyseurs à base de montmorillonite en synthèse organique PY - 2005 UR - https://m2.mtmt.hu/api/publication/2652653 ID - 2652653 LA - French DB - MTMT ER - TY - JOUR AU - Vodnar, J AU - Békássy, Sándor AU - Dulamita, N AU - Lorinczi, I AU - Hell, Zoltán TI - Decomposition of organic hydroperoxides on cation exchangers XV. The kinetics of the decomposition process of p-isopropylcumene hydroperoxide on a catalyst of montmorillonite type JF - REACTION KINETICS AND CATALYSIS LETTERS J2 - REACT KINET CATAL L VL - 83 PY - 2004 IS - 1 SP - 165 EP - 171 PG - 7 SN - 0133-1736 DO - 10.1023/B:REAC.0000037390.61681.ad UR - https://m2.mtmt.hu/api/publication/2635885 ID - 2635885 N1 - Megjegyzés-23996162 PG: 7 Megjegyzés-23996456 PG: 7 AB - The decomposition of p-isopropylcumene hydroperoxide on a catalyst of montmorillonite type containing Sn2+ ions, Sn2+-K10 showed first order kinetics in the range of 45-55degreesC. The activation energy, the enthalpy of activation, the entropy as well as the Gibbs free energy of activation were calculated for the investigated temperature region. Acetone and p-isopropylphenol were produced by this chemical decomposition; both compounds are important intermediates in the chemical industry. LA - English DB - MTMT ER - TY - GEN AU - Békássy, Sándor TI - Applications des catalyseurs à base de montmorillonite dans des synthèses organiques PY - 2003 UR - https://m2.mtmt.hu/api/publication/2652652 ID - 2652652 LA - French DB - MTMT ER - TY - GEN AU - Hell, Zoltán AU - Békássy, Sándor AU - Biró, K AU - Cwik, A AU - Farkas, J AU - Finta, Z AU - Hegedüs, A AU - Horváth, Z TI - Solid acid and base catalysts for cleaner fine chemical processes PY - 2003 UR - https://m2.mtmt.hu/api/publication/2652651 ID - 2652651 N1 - Korábbi besorolás (2014-05-16-ig): Egyéb/Előadás LA - English DB - MTMT ER - TY - THES AU - Békássy, Sándor TI - Szilárdsav-katalizátorok és alkalmazásuk szerves szintézisekben PY - 2003 SP - 57 UR - https://m2.mtmt.hu/api/publication/2649644 ID - 2649644 LA - Hungarian DB - MTMT ER - TY - GEN AU - Békássy, Sándor TI - Applications des catalyseurs à base de montmorillonite dans des synthèses organiques PY - 2002 UR - https://m2.mtmt.hu/api/publication/2652650 ID - 2652650 LA - French DB - MTMT ER - TY - JOUR AU - Dulamita, N AU - Vodnár, J AU - Békássy, Sándor AU - Stanca, M AU - Balaj, S AU - Lőrinczi, I TI - A kumol-hidroperoxid katalitikus bontása Fe3+-K10 jelzésű montmorillonit alapú katalizátoron JF - MAGYAR KÉMIAI FOLYÓIRAT - KÉMIAI KÖZLEMÉNYEK (1997-) J2 - MAGY KÉM FOLY KÉM KÖZL VL - 108 PY - 2002 IS - 4 SP - 170 EP - 172 PG - 3 SN - 1418-9933 UR - https://m2.mtmt.hu/api/publication/2652575 ID - 2652575 LA - Hungarian DB - MTMT ER -