Crystal structures of two macrocyclic diterpenoid photoproducts

The crystal structures of two macrocyclic diterpenoid photoproducts, the chemistry of which has been described in the preceding paper have been determined at 295 K.Compounds I (C₂₀H₂₆O₃) and II (C₂₂H₃₀O₅) are both orthorhombic, P2₁2₁2₁. In I. a = 24.18(1), b = 11.841 c=5.984(2) Å. Z=4. the structure being refined by least squares to a residual of 0.063 for 1234 “observed” reflections. For II. a = 24.30(1), b = 9.413(5). c = 9.149(5) Å. Z = 4 (R = 0.070, 982 “observed” reflections).