Phosphosulfonic acid (PSA) was found to be an efficient catalyst for the one-pot three-component Hantzsch condensation reaction of arylaldehydes, ethylacetoacetate and ammonium acetate to afford the corresponding 1,4-dihydropyridine and polyhydroquinoline derivatives in high yields. PSA was also applied for the one-pot preparation of polyhydroquinolines via four-component reaction of a...

Peter (Peter) Lachmann’s Life in the Space of Translation The article discusses Przemysław Chojnowski’s research on work (Piotr) Lachmann, a German-Polish author born pre-war Gliwice (Gleiwitz). Lachmann consistently thematizes experience borderland, describing his existence between two languages and cultures, that is, “life translation”. culmination Chojecki’s long-time is monograph Liminalnoś...

In this paper two external schema generation algorithms are presented. These algorithms are defined in the framework of the new external schema definition methodology for OODBs put forward in (Samos, 1995); they generate an external schema from a set of classes selected from those existing in an external schema definition repository. Their main characteristic is that they avoid the generation o...