Abstract
Six novel 1,2-bis(1-alkyl-2-methylindol-3-yl)cycloalkene derivatives were designed and synthesized by the intramolecular coupling reaction using low-valance titanium as catalyst. Photochromic properties of these compounds were initially investigated. The results show that the fatigue resistant properties of these compounds, the thermal stability and the absorption maxima of their photocyclization products are influenced by the ring size of cycloalkene and substituents on the heterocyclic rings.
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