An unusually strong metal-arene back-bonding characterizes the bonding in the title complex 1, which is obtained in the form of deep purple-red, air-stable crystals on reduction of [TiCl3(trimpsi)(thf)], trimpsi = tBuSi(CH2PMe2)3, with naphthalenesodium in THF. This 16e-complex has an overall three-legged piano-stool geometry, and the π-bonded naphthalenring has partial dienediyl character.
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Gardner et al. (1988) studied this question.
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