All articles of this category Alkyl-, vinyl- and aryllithium reagents and an ester enolate added efficiently and highly regioselectively ortho to the aromatic substituent of tricarbonyl(4,5-dihydro-4,4-dimethyl-2-phenyloxazole)chromium(0) ( 1 ) and tricarbonyl(benzylidene-cyclohexylamine)chromium(0) ( 2 ) complexes. The tertiary carbanion 2-lithio-2-methylpropionitrile gave a 3:1 para/meta selectivity. Complex 1 was obtained via arene exchange in tricarbonyl(naphthalene)chromium(0).
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Kündig et al. (1991) studied this question.
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