title: 6,7-Bis(bromo-meth-yl)-2,11,18,21,24,27-hexa-oxatetra-cyclo-[26.4.0.0.0]dotriaconta-1(28),4,6,8,12(17),13,15,29,31-nona-ene dichloro-methane monosolvate.
abstract: The title 20-crown-6 unit, C(28)H(30)Br(2)O(6)·CH(2)Cl(2), consisting of three benzo groups and triethyl-ene glycol was prepared from the reaction of 1,2,4,5-tetra-kis-(bromo-meth-yl)benzene and bis-phenol in the presence of sodium hydride. In the crystal, one O atom of the central ethyl-ene glycol in the triethyl-ene glycol unit exhibits an exo conformation as a result of intra-molecular C-H⋯O hydrogen bonds. The crown unit and the solvent mol-ecule are linked by weak C-H⋯O hydrogen bonds.
authors.affiliation: Department of Chemistry, Konyang University, Nonsan 320-711,  Republic of Korea.
authors.forename: Hyun Jin
authors.initials: HJ
authors.lastname: Beack
authors.forename: Seung Mee
authors.initials: SM
authors.lastname: Yoo
authors.forename: Jae Eun
authors.initials: JE
authors.lastname: Kim
authors.forename: Wonbo
authors.initials: W
authors.lastname: Sim
authors.forename: Jai Young
authors.initials: JY
authors.lastname: Lee