Convenient and scalable syntheses of 2-substituted glutaconaldehyde salts were accomplished from the corresponding pyridinium salts. Glutaconaldehyde salts were additionally converted into aminopentadienal derivatives. Zincke aldehydes - aminopentadienal derivatives - pyridinium salts - glutaconaldehyde
Synthesis and structure of novel alkylidenemalonaldehydes: 2-(diformylmethylene)-1,3-dithiane and -1,3-dithiolane as well as (2,3-diphenylcyclopropen-1-ylidene)malonaldehyde