Improved Procedure for 3,4-Dihydro-1H-2-Benzopyran Ring Closure. A General Access to 3-Substituted Isochromanes
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文摘
A general method for the ring closure of 1-substituted 2-(-hydroxymethyl)-phenylethanols to 3-substituted isochromanes using p-TsOH supported on silica gel is reported.
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