Further mechanistic orientation for the oxidation reaction between alkaline permanganate and poly galacturonic acid methyl ester.

The kinetics of formation of the green manganate(VI) intermediate complex formed during the oxidation
of pectin polysaccharide (poly galacturonate methyl ester) (PGME) by MnO4 in alkaline solution at
pHP12 have been studied. The rate law was suggested to be: rate = kobs:½MnO4 . The reaction was found
to be base – catalyzed and fractional second – order in [PGME]. The activation parameters have been evaluated and discussed. A reaction mechanism was suggested according to the experimental data. A new
blue hypomanganate(V) coordination polymer intermediate sol was spectrophotometrically detected
for the first time for pectin (poly galacturonate methyl ester) oxidation reaction. A further mechanistic
presentation was proposed.