پديد آورندگان :
Chreim Yamama نويسنده , Kharaki Khaled نويسنده , Reynaud Stéphanie نويسنده , Billon Laurent نويسنده , François Jeanne نويسنده
چكيده لاتين :
Peresterification of cyclodextrins (beta - and alfa-CD) by bromopropionyl bromide (BPB)
or chloropropionyl chloride (CPC) was performed under mild reactions conditions. The
various experimental parameters influencing the acylation have been defined Pyridine (PY)
was used as catalyst and solvent in the presence of chloroform. The concentrations and the
ratios X=[BPB}/[ beta-CD} and Y=[PY}/[BPB} have been varied. The mechanism and the
reactivity of the reactive have been studied, and the obtained products were checked by 1H
and 13C NMR, FAB-MS, FTIR, and elemental analysis. While BPB leads to a total
esterification of the beta-CD and alfa-CD hydroxyl groups, esterification mediated by CPC is not
quantitative and the kinetics are slower. The optimization ofthe CDs peresterification lead to
new products. which were used as a macroinitiators for the atom transfer radical
polymerization (ATRP) oftert-butylacrylate (t-BA) to prepare star shaped-polymers.
