Should New Fossil Species Be Described from Wells?

Photocycloadditions of Chloranil to Homobenzvalene, Norbornadiene, and Quadricyclane

“…174Ϫ176°C after of Azo-Q to the oxetane 8. of N and Q, only CIDNP signals of N in the first case and 183Ϫ185°C separated (112 mg, 16%), which were shown to be an those of N and Q in the second case have been observed, [17] 8:1 mixture of 6 and most probably 5. accomplished. 3.2 Hz, 4-H), 6.33 (ddd, J 3a,5 ϭ 0.8 Hz, 5-H); the assignments are In the light of the established product structures, further based on the similarity of the fine structure of the signals to that CIDNP studies would seem in order to elucidate the reacseen in the spectrum of 3. 3.2 Hz, 4-H), 6.33 (ddd, J 3a,5 ϭ 0.8 Hz, 5-H); the assignments are In the light of the established product structures, further based on the similarity of the fine structure of the signals to that CIDNP studies would seem in order to elucidate the reacseen in the spectrum of 3.…”

“…Among the quinones, chloranil (CA) is of particular importance with regard to photochemical reactions with alkenes [1,2a] because of the great variety of possible processes, several of which may occur simultaneously with a single substrate. In the case of styrene, [3] cyclooctene, [6] and cyclohexene, [5] 2:1 adducts with CA containing two cyclobutane subunits are produced. In the case of styrene, [3] cyclooctene, [6] and cyclohexene, [5] 2:1 adducts with CA containing two cyclobutane subunits are produced.…”