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Abstract A series of 6 A ,6 X -diguanidio- γ -cyclodextrins (CDs) were used as chiral hosts for mediating the enantiodifferentiating [4 + 4] photocyclodimerization of 2-anthracenecarboxylic acid (AC). These γ -CD… Click to show full abstract
Abstract A series of 6 A ,6 X -diguanidio- γ -cyclodextrins (CDs) were used as chiral hosts for mediating the enantiodifferentiating [4 + 4] photocyclodimerization of 2-anthracenecarboxylic acid (AC). These γ -CD derivatives form stable 1:2 ternary complexes with AC in aqueous ammonia solutions and the head-to-head photodimers 3 and 4 were greatly enhanced in the presence of these diguanidio- γ -CDs. The enantioselectivity of chiral photodimers 2 and 3 is a critical function of the temperature and the ammonia contents, showing inverted product chirality by changing these external factors.
Journal Title: Chinese Chemical Letters
Year Published: 2018
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