three distinct modes of protolytic dialkylnitrosamine fragmentation were observed when we followed the time dependence of the nuclear magnetic resonance ( nmr ) spectra of seven nitrosamines in superacid solution : 1 ) in equimolar hso3f : sbf5 ( `` '' magic acid '' '' ) , dimethylnitrosamine was cleaved to the protonated schiff base of formaldehyde and methylamine , and diethylnitrosamine was similarly converted to the protonated acetaldehydeethylamine schiff base.2 ) by contrast , of the five dipropyl-and dibutylnitrosamines were studied , all cleaved nonoxidatively under these conditions ( with loss of nitrogen gas ) to the corresponding propyl or butyl cations .
C0028197
nitrosamines
C0012431
, dimethylnitrosami