A novel quadruply-fused porphyrin has been synthesized with a facilely prepared precursor in a high yield. A detailed comparison of the physical properties of a series of fused porphyrins revealed remarkable effects of the ring fusion on lowering LUMO levels rather than HOMO levels.

A novel thermally crosslinkable polyolefin was synthesized from biorenewable oleic acid. The obtained polymer exhibited a unique structure, bearing an inner olefin moiety in the long side chain. Since thermal auto‐oxidation and crosslinking reactions occurred at the inner olefin moiety of polymer, it could be cured by heating in air. The resultant polymer exhibited good adhesion properties to various substrates.

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