A new synthesis of a-bromoaldehydes based upon the bromination of enol acetates of aldehydes was described in a previous paper.2 The

The dimer (100 mg.) was dissolved in acetic acid (8 cc.) containing hydrobromic acid (8 cc., 48%), and the solution was boiled for twenty minutes. The mixture rapidly became dark and no pure product could be isolated from it.Dithymoquinone (100 mg.) in ether (30 cc.) was shaken with a solution of sodium hydrosulfite (2 g.) in water (20 cc.) until the color was discharged (forty minutes). From

α‐Bromoheptaldehyde reactant: 285 g. (335 ml., 2.5 moles) of heptaldehyde intermediate: heptaldehyde enol acetate intermediate: α‐bromoheptaldehyde dimethyl acetal product: α‐bromoheptaldehyde

The products obtained by the dehydration and the acetylative dehydration of hydantoin-5-propionic acid have been shown to possess the lactam structure IV and V. Chagrin Falls, Ohio

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