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The graft polymers in the title, in which both the stem and the graft are biodegradable, could be synthesized for the first time in one-pot by the thermal ring-opening graft polymerization (in bulk, at 100 ˚C) of L,L-lactide onto chitin or chitosan. The reactivity of sugars was found to be as follows: chitosan > chitin. All the graft polymers prepared were insoluble in common organic solvents. However, these graft polymers were well swollen in chloroform at room temperature.

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2-Alkyl-3,3-dichlorospiro[cyclopropane-1,9′-fluorene] derivatives (4) were obtained by the addition of CCl2 to 9-alkylidenefluorenes. Ring opening reactions of 4 with bases gave enynes, butadienes, or butatrienes.