Polar and Steric Substituent Effects in 5-exo-trig Cyclizations of 1-Aryl-4-penten-1-oxyl Radicals

✍ Scribed by Jens Hartung; Margit Hiller; Philipp Schmidt

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 32 KB
• Volume: 1999
• Category: Article
• ISSN: 1434-193X
• DOI: 10.1002/(sici)1099-0690(199902)1999:2<523::aid-ejoc523>3.0.co;2-a

✦ Synopsis

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 constants of radical 2d refer to radical 2e and vice versa as correctly stated in the Discussion. In the Experimental Section (Iodocyclization) read 2.25 g (8.86 mmol) of iodine instead of 2.25 g (1.10 mmol) of iodine.