Echanges isotopiques d'hydrogène T‐H, T‐D, D‐H et H‐D de la diazoacétone et du diazoacétaldéhyde: Vitesse de protonation et effets isotopiques. Communication préliminaire

The velocities of four acid‐catalysed hydrogen isotope exchange reactions between diazoacetone ( 1 ) and water (T → H, T → D, D → H, and H → D) and of three exchange reactions between diazoacetaldehyde ( 2 ) and water (T → H, T → D, and H → D) have been measured. The exchange D → H of 1 was found to be submit to general acid catalysis (α B = 0.6). The rates of protonation of primary and secondary diazocarbonyl compounds of similar structure were found to be quite similar, in spite of difference in mecanism ( A ‐2 and A‐S E 2, respectively).