The reaction of LiY [N i Pr 2 ] 4 with H 2 LCl () and BuLi in the molar ratio of 1:3:2 at -78 °C affords a yttrium complex supported by three anionic NHC ligands, L 3 Y (1). Reaction temperature has a great effect on the reaction outcome. The same reaction at room temperature yields a monoanionic NHC yttrium complex co-supported by a bridged bisphenoxo group, LY [(O-4,6di-t formed from the cleaVage of NHC.
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