ligand 81, which possesses hydroxyl groups in the proximity to the primary coordination sphere. Other variants, such as methyl-substituted 82, can be prepared in one
step (Scheme 34).
Complexation studies revealed that 81 is smoothly metalated with RuCl 2 (PPh 3 ) 3
in the presence of stoichiometric amounts of NaOCH 3 and forms ruthenium
(II) pincer complex 83 [98]. Tridentate 83 is readily dehydrohalogenated with
Scheme 33 Synthetic approach to Lewis acid-functionalized pincer complexes 74–76
Scheme 34 Synthesis of the pincer ligands 81 and 82
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