The previous papers of this series contained descriptions of several general methods of preparation of~-chloroacraldehydes (I a) 1-3. One of these methods, the fortnyI-ation of ketones with dimethylformamide-phosphorus oxychloride and with dimethylformamide- carbonyl chloride, has been used later by other authors4, 5. The present paper describes the preparation of~-bromoacraldehydes (Ib) which have not been known so far with but a ...
