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[reaction: see text] The preparation of optically pure ferrocenyl imidazolines starting from ferrocenecarboxylic acid and the application to diastereoselective ortho-metalations is described highlighting the remarkable influence of lithium dialkylamides, especially LDA, as metalation additives (in combination with tert-butyllithium) on the diastereoselectivity.
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Peters et al. (2005) studied this question.
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