... Chem. SOC. 1976, 98, 4229-4235. 0002-7863/80/ 1502-501 2$01 .OO/O 0 1980 American Chemical Society Page 2. ... Stand. Ref Data Ser. (US., Natl. Bur. ... Alternatively the difference in stability of these species may be too small to probe by most chemical reactions. ...