Abstract (MgBr 2· diglyme) 2 (1) crystallized in low yield from an ether solution of the Grignard compound mesMgBr (mes = mesityl) on adding diglyme. It is more conveniently prepared from an ether solution of MgBr 2 by addition of diglyme. The mixed solvate MgBr 2· diglyme thf (2) crystallized from a diglyme/tetrahydrofuran solution of 1 after addition of ether. An X-ray structure determination of 1 reveals dimeric units containing hexacoordinated Mg atoms surrounded by three oxygen atoms and three bromide atoms, with each kind of atoms arranged in a meridional fashion. The two octahedral MgO 3 Br 3 units share a common edge with two Br atoms. Compound 2 is a mononuclear complex with the Br atoms in cis-position. The diglyme ligand occupies meridional positions of a distorted MgBr 2 O 4 octahedron.
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Metzler‐Nolte et al. (1994) studied this question.
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