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Lithium Aluminate Complexes and Alumoles from 1,4-Dilithio-1,3-Butadienes and AlEt2Cl
Yongliang Zhang1, Junnian Wei1, Wen-Xiong Zhang1
1Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University , Beijing 100871, China.
Abstract:
A series of lithium aluminate complexes and alumoles were synthesized from 1,4-dilithio-1,3-butadienes 1 and AlEt2Cl. Their structures were characterized using single-crystal X-ray structural analysis and NMR spectroscopy. The structure of the lithium aluminate complex 2-TMEDA showed that the Al atom adopted a tetra-coordinated mode bonded with two butadienyl Csp2 atoms and two ethyl Csp3 atoms. The lithium cation was located above the alumole ring. The structure of 3a revealed a dimeric 1-ethylalumole in the solid state. Diffusion ordered spectroscopy NMR spectra showed that 3a was also a dimer in C6D6 solvent. However, in tetrahydrofuran (THF) solution, the dimeric 3a dissociated into the 1-ethylalumole-THF adduct. The lithium aluminate complex 2 transformed into 3a-THF when treated with 1.0 equiv of AlEt2Cl. Preliminary reaction chemistry and synthetic applications of the lithium aluminate complex were also investigated.
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