✍ Scribed by Joe A. Crayston; Costas Kakouris; John C. Walton
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Pyrrolyl‐1‐oxyl, 3‐phenylpyrrolyl‐1‐oxyl and a number of deuterium‐substituted derivatives were generated by hydrogen abstraction from the corresponding N‐hydroxypyrroles, and observed by EPR spectroscopy. They were all transient with lifetimes ≤ 10^−2^ s. The hyperfine splittings showed that unpaired spin was delocalized around the five‐membered ring with significant density at N‐1, C‐3 and C‐4, but very low density at C‐2 and C‐5. N‐Hydroxpyrrole and pyrrolyl‐1‐oxyl were studied by the semi‐empirical AM1 method, and the radical by the INDO method. The transient pyrrolinyl‐1‐oxyl was also generated from the corresponding N‐hydroxypyrroline and observed by EPR spectroscopy.
📜 SIMILAR VOLUMES
By mistake wrong concentrations were given in the footnote of Table 1 and in the Discussion. Instead of c 0 ϭ 1.2 read c 0 ϭ 0.12 if 2-naphthalenethiol was used as hydrogen donor and instead of c 0 ϭ 1.8 read c 0 ϭ 0.18 if Bu 3 SnH was used to trap photoproducts. In Table 2 relative rate con
The trisubstituted functionalized tetrahydrofurans 10, 11, 16, 18, and 19 were photochemically prepared from 2,3-syn-and 2,3-anti-configured N-(3-benzoyloxy-5-hexen-2-oxy)thiazole-2(3H)-thione anti-6, pyridinethiones 7, anti-8, and BrCCl 3 . The formation of tetrahydrofurans was achieved by an effic