First photosensitized enantiodifferentiating isomerization by optically active sensitizer immobilized in zeolite supercages

Enantio differentiating photoisomerization of (Z)-cyclooctene sensitized by (R)- or (S)-1-methylheptyl benzoate immobilized in zeolite supercages affo rded the respective enantiomer pair, (-)- and (+)-(E)-isomer (1E) in 5% ena ntiomeric excess, whilst racemic 1E was obtained upon homogeneous-phase pho tosensitization with the same antipodal sensitizer pair, thus demonstrating for the first time that chirally modified zeolites not only serve as supra molecular photosensitizing media but also enhance the original enantiodiffe rentiating ability of chiral photosensitizer.