Abstract
The dilithium salt [Me3SiNCH2CH2NSiMe3] · Li2(THF)2 decomposes slowly upon heating forming a metastable structure of the crystalline [LiN(SiMe3) · THF]2. The crystal structure of the new form was established by single crystal X-ray diffraction showing a decrease in the a and b parameter values of the unit cell, and an expansion of the c value as compared with the structure obtained at room temperature. The major discrepancies among the known and the metastable crystalline framework are the Li-O bond length and the dihedral angle disposition of the trimethylsilyl groups as regarded to the middle Li-N-Li-N heterocyclobutane ring. Attempts to trap the expected additional lithium imine product were unsuccessful although quenching experiments produced polyethyleneimine.
Original language | English |
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Pages (from-to) | 39-43 |
Number of pages | 5 |
Journal | Journal of Organometallic Chemistry |
Volume | 549 |
Issue number | 1-2 |
DOIs | |
State | Published - 18 Dec 1997 |
Externally published | Yes |
Keywords
- Lithium amide
- Polyethyleneimine
- TMS-shift
- X-ray crystal structure