The cyclization of (4-methoxy-5-hexeny1) lithium (11, which was prepared by lithium-iodine exchange between 3-methoxy-6-iodo-1-hexene (2) and 1.75 molar equiv of t-BuLi in diethyl ether-n-pentane solution at-78 “C, has been investigated in a variety of solvent systems. The isomeric composition of the cis-and trans-1-methoxy-2-methylcyclopentane produced upon cyclization of 1 followed by quench with MeOH has been found to be dramatically ...
[Crevisy, Christophe; Couturier, Michel; Dugave, Christophe; Dory, Yves L.; Deslongchamps, Pierre Bulletin de la Societe Chimique de France, 1995 , vol. 132, # 4 p. 360 - 370]