Photochemical transformations of small ring compounds. XLI. Orbital symmetry and steric control in the photorearrangement of 1,3,5-hexatrienes to bicyclo[3.1.0]hex-2-enes
Photochemical transformations of small ring compounds. XLI. Orbital symmetry and steric control in the photorearrangement of 1,3,5-hexatrienes to bicyclo[3.1.0]hex-2-enes
a pyridine-based ligand efficiently proceeds to give the corresponding enyne compound with good yield. In contrast, their 1:2 cross-trimerization leading to a dienynederivative takes place selectively using a triarylphosphine ligand. The regioselective cross-dimerization of some unsymmetrical internal arylalkynes with terminal silylacetylenes is also accomplished using the pyridine ligand.
Photochemical transformations of small ring compounds. XLI. Orbital symmetry and steric control in the photorearrangement of 1,3,5-hexatrienes to bicyclo[3.1.0]hex-2-enes