Highly Enantiodifferentiating Photoisomerization of Cyclooctene by Congested and/or Triplex-Forming Chiral Sensitizers.

In an effort to generate photoproducts with higher optical purities (op), two novel strategies, i.e., intra/intermolecular triplex formation and increased steric hindrance, have been employed in the enantiodifferentiating Z→E photoisomerization of cyclooctene (1) sensitivity by optically active (ar)alkyl bezene(poly)carborylates 2-5 at temperatures ranging from 25 to -90 o C