Hydrolysis of malonaldehyde dianil and .BETA.-arylaminoacrolein derivatives.
作者:SHINZO TAMURA、MACHIKO ONO、KAZUMI FURUYAMA
DOI:10.1248/cpb.28.2356
日期:——
The reversible hydrolysis of β-arylaminoacrolein to form arylamine and malonaldehyde was studied kinetically. The catalytic coefficient of hydronium ions (kH+) and dissociation constant of the conjugate acid of β-arylaminoacrolein (KBH+) were evaluated. Hammett plots for kH+ and for KBH+ were linear. The values of log kH+ and pKBH+ were expressed by the equations log kH+=1.38σ-2.81 and pKBH+=-1.20σ+0.90, respectively. The reversible hydrolysis of malonaldehyde dianil to form β-arylaminoacrolein and arylamine was examined in relation to that of β-arylaminoacrolein. The preparation of β-arylaminoacrolein by hydrolysis of malonaldehyde dianil was achieved under weakly acidic conditions.
Hydrolysis of acyl derivatives of malonaldehyde dianil. I.
作者:SHINZO TAMURA、MACHIKO ONO
DOI:10.1248/cpb.29.308
日期:——
The hydrolysis of acyl derivatives of malonaldehyde dianil was examined. Alkaline hydrolysis of 1-(N-acetyl-p-methylphenylamino)-3-(p-methylphenylimino)-1-propene (V) in aqueous ethanol gave simply 1-(p-methylphenylamino)-3-(p-methylphenylimino)-1-propene (malonaldehyde dianil of p-toluidine) (VI) and acetic acid. Hydrolysis of 1-(N-benzoyl-p-methylphenylamino)-3-(p-methylphenylimino)-1-propene (VII) in aqueous dioxane in the presence of equimolar amounts of acetic acid and sodium acetate gave β-(p-toluidino) acrolein (VIII), β-(N-benzoyl-p-toluidino) acrolein (XIII) and N-benzoyl-p-toluidine. A small amount of β-(p-toluidino) crotonaldehyde (II) was obtained by hydrolysis of 1-(N-benzoyl-p-methylphenylamino)-3-(p-methylphenylimino)-1-butene (IX). The buffer-catalyzed hydrolysis reaction of VII was followed by measuring the PMR spectrum of the reaction solution to elucidate the sequence of the reaction process.