Fig. 1
From: Photoresponsive spiro-polymers generated in situ by C–H-activated polyspiroannulation

Developing the spiroannulation reaction into a polyspiroannulation strategy. a Palladium(II)-catalyzed oxidative spiroannulations of naphthols and diarylacetylenes and the associated mechanism. b Palladium(II)-catalyzed polyspiroannulations of free naphthols and internal diynes for the construction of complex spiro-polymers in this work. [1]:[2] = molar feed ratio of monomer 1 and 2.