
%0 Journal Article
%A Bowie, JH 
%A Gream, GE 
%A Laffer, MH 
%T Benzene-induced solvent shifts of proton resonances in the N.M.R. spectra of &#945;-diketones
%J Australian Journal of Chemistry
%D 1968/07/01
%V 21
%N 7
%P 1799-1805
%K 
%R https://doi.org/10.1071/CH9681799
%U https://www.publish.csiro.au/paper/CH9681799 
%X Solvent shifts [&#916;C6H6 = &#948;CCk4 ? &#948;CCl4 p.p.m.] are recorded for a number of acyclic and cyclic &#945;-diketones. Benzene produces upfield shifts of methyl and methylene resonances in the spectra of saturated acyclic and cyclic &#945;-diketones. The shift of the &#945;-methylene resonance of acyclic a-diketones may be related to the length (and bulk) of the side-chain. The formation of a 1 : 1 complex is proposed, and variable temperature studies (in toluene-ds) have allowed calculation of thermodynamic parameters for an acyclic and a cyclic compound. The dependence of solvent shifts on the position of methyl and hydrogen substituents of aromatic &#945;-diketones has been demonstrated. 
