Dibromo1,1′-oxybix2-ethoxyethane-O,O′,O″-(tetrahydrofuran-O) magnesium, C12H26O4MgBr2, crystallizes in space group Pbca witha=7.402(1),b=16.726(2),c=29.248(3) Å,V=3620.9(12) Å3,Z=8. The structure was refined toR=0.083 andRw=0.055 for 1880 observed reflections. Magnesium is octahedrally coordinated by twocisbromine atoms and four oxygen atoms, three from the meridional ethyl diglyme and one from tetrahydrofuran. The Mg−Br distances are 2.614(3)transto thf and 2.529(3) Åtransto the central O of the diglyme. The Br−Mg−Br angle is 97.9(1)° and the Mg−O(thf) distance is 2.196(6) Å. The O−Mg−O bite angles subtended by the diglyme are 75.3(2) and 75.7(2)°. The Mg−O(ethyl diglyme) distances are 2.127(6),
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