Keywords
alkylation
catecholcarbaldehyde
catechols
o-quinones
oxidation
reduction.
Abstract
1,1,4,4-Tetramethylbutane-1,4-diyl substituent fused to positions 5,6 of 2,3-dihydroxybezaldehyde (‘catecholcarbaldehyde’) upon the action of acids readily moves to positions 3,4 to afford less strained isomer, with the optimum reagent being neat methanesulfonic acid acting at room temperature. The same compound was prepared in four steps from 3,4-(1,1,4,4-tetramethylbutane-1,4-diyl)phenol; the intermediates were the mixtures of 3,4- and 4,5-fused o-benzoquinones/catechols whereas the last step involved the abovementioned substituent moving.
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