Synthesis of [LiPPh(SiMe3)(tmeda)]2 (from Mg(PHPh)2(tmeda) or Li(PHPh)(tmeda)) and the X-ray structure of the trans-isomer (tmeda = N,N,N′,N′-tetramethylethylenediamine)

Evamarie Hey, Colin L. Raston, Brian W. Skelton, Allan H. White

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17 Citations (Scopus)

Abstract

Treatment of either (i) Mg(PHPh)2(tmeda) with two equivalents of n-BuLi then with an excess of Me3SiCl or (ii) Li(PHPh)(tmeda) with Me3SiCl followed by n-BuLi yields [LiPPh(SiMe3)(tmeda)]2. Below ca. 0 and 5°C 31P and 7Li NMR spectroscopy shows that there is coupling of 7Li nuclei to two equivalent 31P nuclei, and vice versa. This is consistent with the dimeric structure found in the solid for the trans-isomer by an X-ray structure determination. The phosphido groups bridge two lithium centres to form Li2P2 rings; LiP (mean) 2.62 Å, LiN (mean) 2.16 Å, PLiP 94.5(6), 92.0(6)°, LiPLi 85.5(5), 88.0(5)°.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalJOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume362
Issue number1-2
DOIs
Publication statusPublished - 28 Feb 1989
Externally publishedYes

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