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[摘要]：We prepared anti/syn-regioisomeric mixtures of alkyl-substituted tetracenes via Diels-Alder reaction between asymmetric furans and 2,6-naphthodiyne synthon. The solid-state color of the mixtures changed before and after recrystallization from Et(2)O, suggesting a difference in the molecular arrangements dependent on the different alkyl substituents as well as the change in the distribution of the anti/syn regioisomers after recrystallization. Slow evaporation of the recrystallized mixtures produced single crystals suitable for X-ray analysis, which revealed that the anti regioisomer was isolated. |
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