Allyl-lithium: a rapidly equilibrating, unsymmetrical dimer in tetrahydrofuran

1 January 1987

journal article
research article
Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Chemical Communications

No. 3,p. 177-179
https://doi.org/10.1039/c39870000177

Abstract

Cryoscopic measurements and variable temperature ¹³C n.m.r. studies on isotopically perturbed samples show allyl-sodium and allyl-potassium to have symmetrical structures, but allyl-lithium to be an unsymmetrical dimer in tetrahydrofuran; this association explains the discrepancy between the observed rotational barrier (10.7 kcal/mol) and that calculated for the isolated allyl-lithium monomer (17.7 kcal/mol)(1cal = 4.184J).

Keywords

SODIUM
STRUCTURES
UNSYMMETRICAL
DIMER
TETRAHYDROFURAN
KCAL/MOL
ALLYL LITHIUM
ISOTOPICALLY
CRYOSCOPIC

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