Rates and activation parameters are obtained for the hydrolysis of trans-3ax,4ax-dihalogeno-3,4-dihydro-2H-naphtho[1;2-b]pyrans and trans-1ax,2ax-dihalogeno-2,3-dihydro-1H-naphtho[2,1-,6]pyrans1 and the methanolysis of the latter compounds in acetone–water and acetone–methanol, respectively.
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