The crystal and molecularstructures of a series of N-phenyl-substituted lithium hydrazides were determined in order to investigate possible Li···Ph π interactions. These are pronounced when there are no donor molecules present to solvate the Li centers. An η6-Li···Ph interaction is particularly distinct in tetrameric (Me3Si)2N–N(Ph)Li but also in trimeric Ph2N–N(SiMe3)Li Deprotonation of N,N′ -diphenylhydrazine
Reduction of azocompounds with a system of a trialkylchlorosilane and lithium has been found to afford bis(trialkylsilyl)amines in the presence of a transition metal halide as a catalyst in THF. The reaction course was significantly modified by using t-butyldimethylchlorosilane as a trialkylchlorosilane.
strong bases (n-BuLi, s-BuLi/TMEDA, n-BuLi/t-BuOK, TMPMgCl·LiCl, and LDA) reduce the N═N bond of the parent azobenzene (Y = H), aromatic H→Li permutation occurs with LTMP when a suitable director of lithiation (Y = OMe, CONEt2, F) is present in the benzene residue of the azo compound. The method allows direct access to new substituted azobenzenes.