We have been recently intensted in the kinetics of the reactions of glycols with halogen hydradaIs in acede add tmxlinm and in the cleavages of estets in acetic acid medium'. For the first displacement of rucdon with the haloen hy&tids in l adc acid, we postulated a mechanism involving neighbourlng hydmxyl group participation consistent with OIL laula winein we found that the fint displacement rates are of the ordu. ethylene glycol~~opylene glyco1)'l.B blunt di&l,4bmnc&ol. We also found that the secorddisplacement rates am very slow compared to the rates of fiw d&pLcemeat. In tbc case of 1.4 butane did we could compute the rater of bath the disp+&enu usiJ Fmst-Schwemer treatment. We wish to comment on the statements made by Wimtein and otlmrs' in tbcir synthetic week on reactions of Blpok ufd~ halogen hydra&is in acetic add. They postulated an immediate estedfication of lbe hydoxyl group 0) ata acemxy &dvadve followed by cleavage leading to the dlhalo compound or the halohydtin depending of the hydtadd empIoyed_ Out contatbm ti that these reactions ate facile in acetic acid due to general solvent effects and they need not go through acaoxy MvatIve and ou arguments in favout are: