Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 53152-69-5, C10H22N2. A document type is Article, introducing its new discovery., SDS of cas: 53152-69-5
6Li and 13C NMR spectroscopic studies were carried out on [6Li]n-BuLi and [6Li]PhLi (RLi) in toluene-d8 containing the following diamines: N,N,N?,N?-tetramethylethylenediamine (TMEDA), N,N,N?,N?-tetraethyiethylenediamine, 1,2-dipyrrolidinoethane, 1,2-dipiperidinoethane, N,N,N?,N?-tetramethylpropanediamine, trans-(R,R)-N,N,N?,N?-tetramethylcyclohexanediamine, and (-)-sparteine. Dimers of general structure (RLi)2S2 (S = chelating diamine) are formed in each case. Treatment of RLi with two different diamines (S and S?) affords homosolvates (RLi)2S2 and (RLi)2S?2 along with a heterosolvate (RLi)2SS?. Relative binding constants and associated free energies for the sequential solvent substitutions are obtained by competing pairs of diamines. The high relative stabilities of certain heterosolvates indicate that solvent binding to the RLi dimer can be highly correlated. Rate studies of both the 1,2-addition of RLi/TMEDA to the N-isopropylimine of cyclohexane carboxaldehyde and the RLi/TMEDA-mediated alpha-lithiation of the N-isopropylimine of cyclohexanone reveal monomer-based transition structures, [(RLi)(TMEDA)(imine)]?, in all cases. The complex relationships of solvent binding constants and relative reactivities toward 1,2-additions and alpha-lithiations are discussed.
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