Oxokohlenstoffe und verwandte Verbindungen, 31 [1]. 3-Antipyryl-4-hydroxy-cyclobutendion (Antipyrylsemiquadratsäure) und seine Derivate / Oxocarbons and Related Compounds, 31 [1]. 3-Antipyryl-4-hydroxy-cyclobutenedione (Antipyrylsemisquaric Acid) and its Derivatives

Arthur H. Schmidt, Jochen Kohler, Ramona Pretsch, Sarah von Freytag-Loringhoven, Peter R. Wiesert
2008 Zeitschrift für Naturforschung. B, A journal of chemical sciences  
Antipyrylsemisquaric chloride (9) has been prepared with excellent yield from antipyrylsemisquaric acid (8) and oxalic dichloride in the presence of dimethylformamide. Reaction of 9 with N and S nucleophiles afforded antipyrylsemisquaric acid derivatives, such as amides 12a - t, 14a - e, 15, hydrazides 18a - e, and thioesters 21a - i.
doi:10.1515/znb-2008-0108 fatcat:4l6c3mzfbrgzbgpthqr2dhaomy