A more detailed insight into the structure of the 1-azaallyl anion of a SAMP-hydrazone has been made possible by the first X-ray crystallographic study of a chiral monomeric azaenolate. The lithiated 2-acetylnaphthalene-SAMP-hydrazone 1 exists as rubyred crystals; it has an η1-structure with intramolecular methoxychelatization, while the lithium ion is solvated by two THF molecules.
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Enders et al. (1988) studied this question.
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