A general and efficient method for the preparation of spiro compounds is described. Various enone‐aldehydes were exposed to t‐dodecanethiol and AIBN at 75 °C in toluene to afford spirocyclic 1,4‐diketones in moderate to good yields.
A solvent-controllable photoreaction involving 4-methoxyazobenzenes has been developed to synthesize 1-aryl-1H-benzimidazoles or N-arylbenzene-1,2-diamines in moderate to good yields.
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