Abstract
Analyses and dilution studies of the di-Grignard reagent of 4,4′-dibromodiphenyl ether in tetrahydrofuran have shown that its composition is concentration dependent. Molecular-weight determinations by light scattering and isopiestic techniques show that, although dissociation occurs, the reagent is polymeric at great dilutions the molecular shape approximating to a rod-like structure. The solute species approach the composition RMg3Br4 which corresponds to the R2Mg,MgX2 formula of mono-Grignard reagents.
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