Abstract
Reaction of readily available N-benzylbenzamide ( 1) with a slight excess of BuLi produces a deep blue dianion. Under suitable conditions (THF, −40°C), 1 may be used as a stoichiometric reagent to titrate n-BuLi, s-BuLi, and t-BuLi with good precision. Less reactive alkyllithiums (MeLi and MeLi·LiBr), aryllithiums, and LDA may be titrated at higher temperatures (−20 to 0°C). Titres are comparable to those obtained using the Gilman double titration method, and there appears to be no interference from alkoxides.
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