NHC‐Adducts of Cyclopentadienyl‐Substituted Alanes

Abstract

AbstractThe mono‐ and bis‐iodo‐substituted NHC‐stabilized alanes (NHC) ⋅ AlH2I and (NHC) ⋅ AlHI2 offer a convenient entry for further substitution reactions at aluminum. Reactions of (NHC) ⋅ AlH2I 1–4 with one equivalent of NaCp afforded the adducts (NHC) ⋅ AlH2Cp 9–12 (NHC=Me2ImMe (9), iPr2ImMe (10), iPr2Im (11), Dipp2Im (12)). Alane adducts with two Cp substituents (NHC) ⋅ AlHCp2 13–16 (NHC=Me2ImMe (13), iPr2ImMe (14), iPr2Im (15), Dipp2Im (16)) were prepared by the analogous reaction of (NHC) ⋅ AlHI2 5–8 using two equivalents of NaCp. The unusual dimeric adducts ((NHC) ⋅ AlH2Cp ⋅ CpMgI)2 17–19 (NHC=Me2ImMe (17), iPr2ImMe (18), iPr2Im (19)) were obtained from the reaction of 1–3 with MgCp2.