Buback, M.; Bünger, J.; Tietze, L. F.
Pressure-Induced Diastereoselectivity in Photochemical [2+2]-Cycloaddition Reactions
Chem. Ber. 1992, 125, 2577-2582.
 

Photochemical [2 + 2] cycloaddition reactions under high pressure of cyclopentenone 1a or cyclohexenone 15, as well as of 1a or 3-substituted cyclopentenones 1b-d with cyclopentene (2), and of 1b with 3,3-dimethyl-1-butene (18) are described. Whereas the pressure dependence on the regioselectivity in the photoaddition of 1a and 15 is very small, ΔΔV^≠ values up to 2.0 ± 0.3 cm³ · mol^-1 have been found for the diastereoselectivity in the reactions of 1a-d with 2 and of 1b with 18.