Abstract
Treatment of CpW(CO) 3 [η 1 -CH 2 C≡C(CH 2 ) n -Ar] (n = 0-1) with triflic acid catalysts (25 mol %) in cold CH 2 Cl 2 (-95 °C) effects a new cyclocarbonylation reaction to give CpW(CO) 2 (π-cyclopentenonyl) and CpW(CO) 2 (π-cyclohexenonyl) compounds; these results provide direct evidence for addition of neutral aryl C-H bonds to coordinated carbonyl groups. © 1999 American Chemical Society.