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A new lithium reagent, lithium o-lithiobenzyl oxide (1), provides a facile entry to compounds of types (2) and (3). After transformation into an analogous reagent substituted benzyl alcohols react with benzaldehyde to give compounds of type (4). Products (2) to (4) cannot be synthesized from phthalic acid derivatives.
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Meyer et al. (1978) studied this question.
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