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The new N -heterocyclic carbene ligands functionalized with indenyl and fluorenyl groups, 1-[ind-(CH 2 ) 2 ]-NHC, ( Ind-NHC) -, and 1-[fl-(CH 2 ) 2 ]-NHC, ( Fl-NHC) -, where ind = 1-indenyl, fl = 9-fluorenyl, NHC = 3-DiPP-imidazol-2-ylidene, DiPP = 2,6-Pr i 2 -C 6 H 3, serve as versatile building blocks of Ti(III) and V(III) complexes.
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Downing et al. (2006) studied this question.
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