1.1: thionyl chloride / 0 - 20 °C 2.1: N,N,N',N',N'',N''-hexamethylphosphoric triamide; diisopropylamine; n-butyllithium / hexane; tetrahydrofuran / 1 h / -78 - 0 °C / Inert atmosphere 2.2: -78 - 20 °C 3.1: N,N,N',N',N'',N''-hexamethylphosphoric triamide; diisopropylamine; n-butyllithium / hexane; tetrahydrofuran / -78 - 20 °C / Inert atmosphere 4.1: potassium hydroxide; water / methanol / 24 h / Reflux 4.2: pH 3 5.1: sodium hydroxide / water; acetone 6.1: bromine / hexane / 1 h / 20 °C 7.1: sodium hydroxide; water / 24 h / Reflux View Scheme

1: thionyl chloride 2: aqueous ammonia 3: thionyl chloride 4: platinum; acetic acid anhydride / Hydrogenation View Scheme

1,3-dimethyl-imidazolidin-2-one; ammonia; stannous oxide T=280°C; 48 h; Inert atmosphere; ConcentrationTime;

1,3-dimethyl-imidazolidin-2-one; ammonia; stannous oxide T=280°C; 48 h; Inert atmosphere; ConcentrationReagent/catalystTemperatureTime;

ammonia; stannous oxide T=170 - 280°C; 4 h; ConcentrationTemperatureTimeReagent/catalyst; Overall yield = 94.7 percent;

ammonia; stannous oxide T=210 - 280°C; 9 h; ConcentrationReagent/catalystTime; Overall yield = 90.2 percent;

in acetic anhydride

Erhitzen des jeweils erhaltenen polymeren Anhydrids unter vermindertem Druck;

Erhitzen des jeweils erhaltenen polymeren Anhydrids unter vermindertem Druck;

1: thionyl chloride 2: aqueous ammonia View Scheme