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N-lithio-N,N′,N″,N″-tetramethyldiethylenetriamine (I-Li) is formed from 2,5,8,11-tetramethyl-2,5,8,11-tetraazadodecane (III) or from 2,5,8,11,14,17-hexamethyl-2,5,8,11,14,17-hexaazaoctadecane (IV) with n-BuLi or sec-BuLi, respectively, its isomer N′ -lithio-N,N,N″,N″,-tetramethyldiethylene-triamine (II-Li) from tris(2-dimethylaminoethyl)amine (V) with n-BuLi. IV results from treatment of N-lithiomethyl-N,N′,N″,N″-tetramethyldiethylenetriamine (PMDTA-Li) with 1,2-dibromoethane.
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