Inclusion Properties of Acyclic p-Substituted Phenol–Formaldehyde Oligomers

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Abstract
Acyclic para-substituted phenol–formaldehyde oligomers (R=H, Me, n-Bu, t-Bu, and cyclohexyl; the number of phenol units=3–6) form host–guest complexes with various organic compounds. The inclusion property of the acyclic oligomers is greatly influenced by the p-substituents of phenol and the number of phenol units in the oligomers; for example, a) while the t-butyl tetramer is effective, the corresponding butyl tetramer has a poor ability for the complex formation, and b) the tetramers and pentamers are good hosts for organic compounds, forming 2:1 (host:guest) complexes in many cases.