✦ LIBER ✦

Solution and solid-state structures of lithiated cyclic phosphonates

✍ Scribed by Scott E. Denmark; Kevin A. Swiss; Paula C. Miller; Scott R. Wilson

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 212 KB
Volume: 9
Category: Article
ISSN: 1042-7163
DOI: 10.1002/(sici)1098-1071(1998)9:2<209::aid-hc17>3.0.co;2-v

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✦ Synopsis

Spectroscopic analysis of lithiated cyclic phosphonates belonging to the 1,3,2-dioxaphosphorinane 2-oxide class have been examined by NMR spectroscopy in THF and by single-crystal X-ray crystallography. Lithio P-benzyl-1,3,2-dioxaphosphorinane 2-oxide (Li ‫ם‬ 7 ‫מ‬ ) and lithio P-isopropyl-1,3,2-dioxaphosphorinane 2oxide (Li ‫ם‬ 8 ‫מ‬ ) are characterized by freely rotating, sp 2hybridized anions devoid of lithium-carbon contacts. The anions are most likely dimers linked through oxygen-lithium bridges. The P-isopropyl compound crystallized from TMEDA/THF as a C-lithiated dimer in which each lithium bridges a carbon and an oxygen and is solvated by one TMEDA molecule.

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