Equilibrium data are presented for 1:1 adduct formation between 4-methoxyacetophenone and 4,4′-dimethoxybenzophenone and various covalent metal halides in ether solution. The observed order of acidity towards both ketones is GaBr3∼ GalCl3 [graphic omitted] ZnBr2∼ ZnCl2 > BF3. It is suggested that hydrogen bonding plays a part in determining the stability of boron fluoride–acetophenone adducts.
A. Mohammad, D. P. N. Satchell and R. S. Satchell, J. Chem. Soc. B, 1967, 727 DOI: 10.1039/J29670000727
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