Nanosecond-scale pulsed laser irradiation of cis,cis-1,3-cyclooctadiene via an Nd:YAG laser at 266 nm induced highly selective cyclization of the 1,3-diene moiety to afford cis-bicyclo[4.2.0]oct-7-ene in high yield. The pulsed Nd:YAG laser light is highly monochromatic thereby allowing efficient control of the photoreaction selectivity by controlling the photostationary state.
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