Abstract
Different copolymers of styrene and 4-vinylpyridine were prepared using an easy set-up ‘living’ free-radical polymerization method. After reaction with spiro[cyclopropene-1,9′-fluorenes] on to the pyridine subunits, photochromic coploymers are obtained with controlled weight. Compared to corresponding free dihydroindolizine, a slight bathochromic shift is observed.