addition to sulphonation. These reactions are related tointermediate
benzylic carbonium ions (L3), which can form a
double bond (L4) by proton elimination or can participate
in Friedel-Crafts alkylation on activated aromatic rings,
leading to the condensation products L5 and L6 (Scheme
3).
The different cellulose processes which vary the digestion
temperature and time and the amounts and the ratios of Ca2+/