Abstract
Summary of main observation and conclusionA series of dicarbene‐bridged metallacycles [Ag2(1)2](PF6)2, [Ag2(2)2](BF4)2, [Ag2(3)2](PF6)2, [Ag2(7)2](BF4)2, [Ag2(8)2](BF4)2 and [Ag2(11)2](PF6)2 were obtained in high yields via the reactions of 1,2,4‐triazole‐, 1,2,3‐triazole‐ and imidazo[1,5‐a]pyridine‐based ligands with Ag2O in CH3CN. The C=C double bonds in all of the newly synthesized metallacycles went through [2 + 2] photodimerization under UV irradiation condition (λ = 365 nm, T = 298 K) yielding the dinuclear rctt‐cyclobutane‐silver(I) complexes [Ag2(4)](PF6)2, [Ag2(5)](BF4)2, [Ag2(6)](PF6)2, [Ag2(9)](BF4)2, [Ag2(10)](BF4)2 and [Ag2(12)](PF6)2, respectively with quantitative yields. Treatment of the these cyclobutane‐bridged silver(I) complexes with NH4Cl resulted in the exclusive formation of cyclobutane derivatives after removal of the silver(I) metal ions.
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