Add time:08/08/2019         Source:sciencedirect.com

Conversion of the ester substituents on the cyclobutene π-bond of dimethyl tricyclo[4.2.1.02,5]nona-3,7-diene-3,4-dicarboxylate to the corresponding acid chloride increases the cycloaddition reactivity toward quadricyclane so dramatically that the reaction temperature can be dropped from 180 °C (preparation of title 3,10-diester) to room temperature (preparation of the title 3,10-diacid chloride). The cycloadduct product, an acid chloride of the title ring system, is extremely docile and can be recrystallized unchanged from hot methanol.

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