Abstract
Photoirradiation of a 2:1 inclusion crystal of 2-pyridone with biphenyl-2,2-dicarboxylic acid in the solid state gave its trans-anti-dimer. Since photoirradiation of a mixture of biphenyl-2,2'-dicarboxylic acid and an excess of 2-pyridone in the solid state gave the trans-anti-dimer in a quatititative yield, it is clear that inclusion complexation of the two components occurs followed by photodimerization in the inclusion complex and that the host compound is used as a catalyst. However, a 2:2 inclusion crystal of 4-pyridone with rac-2,2'-dihydroxy-1,1'-binaphthyl was inert to the photoirradiation. Crystal structures of these inclusion compounds were studied by X-Ray analysis.
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