The Diels-Alder reaction, in which there is the possibility of the formation of more than one product, has been extensively investigated; however, the asymmetrical nature of reacting species has not permitted unequivocal evaluation of the electronic effect in determining the isomer formed. 3 The introduction of a group on the 2-position of the anthracene nucleus permits the formation of two isomeric products in the reaction with maleic anhydride. The ...
