Abstract
Reaction of resorcinol and 1,4-butanedial [(CH2)2(CHO)2] in the presence of concentrated HCl in ethanol at 80 °C for 48 h afforded a soluble polymer (CRA−polymer) in quantitative yield under thermodynamic control. Single X-ray crystal analysis revealed that the precursor product had cyclic structure, and TOF mass spectroscopy of CRA−polymer revealed a ladder structure with calixresorcinarene moieties in the main chain. The photoinduced deprotection reaction of CRA−polymer derivative (CRA−polymer−BOC) containing tert-butyloxycarbonyl groups were examined in the film state in the presence of photoacid generator to produce the alkaline developable CRA−polymer with release of isobutylene and carbon dioxide.
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