18.3.4 Wavelength Control of Supramolecular Photochirogenesis
Mediated by CDs
Excitation wavelength is a photochemistry-specific external variable, which is totally
independent of the ground-state thermodynamics and the excited-state kinetics, but is a
unique tool for controlling the photochirogenic consequences through the spectral
difference among the relevant diastereomeric precursor complexes. The wavelength
effects on the regio- and enantioselectivities of AC photocyclodimerization have
recently been examined, using native and modified γ-CDs 28, 33a, 33b, 44, and 45
(Fig. 9) as chiral hosts [42, 43]. Thus, the photocyclodimerization of AC with native
Fig. 7 Photocyclodimerization of AC to classical 9,10:9
0 ,10
0 -cyclodimers 18–21 and nonclassical
5,8:9
0 ,10
0 -cyclodimers 36 and 37 mediated by native and cationic β-CDs 38–43
520
J. Yao et al.
Mediated by CDs
Excitation wavelength is a photochemistry-specific external variable, which is totally
independent of the ground-state thermodynamics and the excited-state kinetics, but is a
unique tool for controlling the photochirogenic consequences through the spectral
difference among the relevant diastereomeric precursor complexes. The wavelength
effects on the regio- and enantioselectivities of AC photocyclodimerization have
recently been examined, using native and modified γ-CDs 28, 33a, 33b, 44, and 45
(Fig. 9) as chiral hosts [42, 43]. Thus, the photocyclodimerization of AC with native
Fig. 7 Photocyclodimerization of AC to classical 9,10:9
0 ,10
0 -cyclodimers 18–21 and nonclassical
5,8:9
0 ,10
0 -cyclodimers 36 and 37 mediated by native and cationic β-CDs 38–43
520
J. Yao et al.