1985
DOI: 10.1139/v85-444
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Reversible ring opening in the hydrolysis of spiro ortho esters

Abstract: . Hydrolysis kinetics are reported for four spiro ortho esters: 3,4-dihydro-6-methoxy-I H-2-benzopyran-1-spiro-2'-11,3'-dioxolane (13), its 11,3'-dioxane analog (14), and the 6-unsubstituted versions of each (11 and 12). For comparison, also included are the diethoxy analogs: 1 ,l-diethoxy-3,4-dihydro-6-methoxy-1H-2-benzopyran (10) and the 6-unsubstituted compound (9). Product analysis implicates an initial opening of the dioxolane or dioxane ring in the spiro ortho esters, as expected on the basis of stereoel… Show more

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