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The title 20-crown-6 unit, C 28 H 30 Br 2 O 6 ·CH 2 Cl 2 , consisting of three benzo groups and triethyl­ene glycol was prepared from the reaction of 1,2,4,5-tetra­kis­(bromo­meth­yl)benzene and bis­phenol in the presence of sodium hydride. In the crystal, one O atom of the central ethyl­ene glycol in the triethyl­ene glycol unit exhibits an  exo  conformation as a result of intra­molecular C—H⋯O hydrogen bonds. The crown unit and the solvent mol­ecule are linked by weak C—H⋯O hydrogen bonds.

acta crystallographica. section e

6,7-Bis(bromomethyl)-2,11,18,21,24,27-hexaoxatetracyclo[26.4.0.0<sup>4,9</sup>.0<sup>12,17</sup>]dotriaconta-1(28),4,6,8,12(17),13,15,29,31-nonaene dichloromethane monosolvate

6,7-Bis(bromomethyl)-2,11,18,21,24,27-hexaoxatetracyclo[26.4.0.04,9.012,17]dotriaconta-1(28),4,6,8,12(17),13,15,29,31-nonaene dichloromethane monosolvate

6,7-Bis(bromomethyl)-2,11,18,21,24,27-hexaoxatetracyclo[26.4.0.0^4,9.0^12,17]dotriaconta-1(28),4,6,8,12(17),13,15,29,31-nonaene dichloromethane monosolvate