Aj. Edwards et al., ON ENANTIOSELECTIVE DEPROTONATION - SYNTHESIS AND CRYSTAL-STRUCTURE OF A CHIRAL AMIDOLITHIUM TETRAHYDROFURAN COMPLEX, Journal of organic chemistry, 58(25), 1993, pp. 6942-6943
The enantioselective base (RR')-bis(1-phenylethyl)amidolithium (1) was
crystallized from THF/hexane and characterized by X-ray crystallograp
hy as a bis-THF-solvated cyclic dimer which adopts a conformation that
maximizes methyllithium contacts, inconsistent with previous rational
izations of its enantioselectivity in enolizations of cyclic ketones.