Four‐Membered 1,8‐Naphthalenediyl Transition Metallacycles

Abstract

Five 1,8‐naphthalenediyl transition metal compounds 2 were prepared by treating either 1,8‐naphthalenediylmagnesium ( 1 ) or 1,8‐dilithionaphthalene with the appropriate transition metal dichloride L n MCl 2 : L n M = Cp 2 Ti ( 2a ), (PEt 3 ) 2 Pt ( 2b ), Cp * PPh 3 Rh ( 2c ), Cp * PPh 3 Ir ( 2d ), or Cp * 2 Zr ( 2e ). The resulting metallacycles were characterized by NMR and mass spectrometry. X‐ray crystal structure analyses were performed for (1,8‐naphthalenediyl)titanocene ( 2a ) and (1,8‐naphthalenediyl)bis(triethylphosphane)platinum ( 2b ). Despite the strain induced by the four‐membered metal‐containing rings, the naphthalene units show remarkably small distortions.