1: thionyl chloride / 1 h / 50 °C 2: 1.) triethylamine; 2.) 20percent HCl / 1.) chloroform, 35 deg C, 5 h; 2.) chloroform, reflux, 5 h 3: sodium hydroxide / ethanol / 1 h / Heating 4: 1.) hydrazine hydrate; 2.) potassium hydroxide / 1.) triethanolamine, 130 deg C; reflux, 4 h; 2.) triethanolamine, 200 deg C, 9 h View Scheme

1: 1.) triethylamine; 2.) 20percent HCl / 1.) chloroform, 35 deg C, 5 h; 2.) chloroform, reflux, 5 h 2: sodium hydroxide / ethanol / 1 h / Heating 3: 1.) hydrazine hydrate; 2.) potassium hydroxide / 1.) triethanolamine, 130 deg C; reflux, 4 h; 2.) triethanolamine, 200 deg C, 9 h View Scheme

potassium hydroxide

Hydrolysis.in alkalischem Medium, Decarboxylierung der erhaltenen Tetracarbonsaeure;

Durch Verseifen;