plified additivity of the volumes of the pure substances was assumed (from the densities of CO,[iO1). According to Figure 2 the solubility increases monotonously with increasing pressure and reaches a value of ca. 40 g-dm-3 at 250 bar. The slopes of the curves differ only slightly above and below the critical temperature of C02. However, at temperatures below the critical point of COz, some of the curves intersect at a concentration of ca. 35 g.dm-3 and a pressure of ca. 180 bar.The systems squalane + C0215' and caffeine + CO2I9] be-

The related iminyl oxide radicals (2)[*1 have a-electronic structure, independent of the type of substituents, while ally1 radicals (3) have a-electronic structure in all conformations. ReceivedJuly 2, 1980 [Z 732 IE] German version: Angew. Chem. 93, 400 (1981) CAS Registry numbers: (lo), 77241-83-9; (lb), 77286-38-5; (lc), 77241-84-0; (Id), 77241-85-1; (le), 77241-86-2; (18, 77241-87-3; (1s). 77286-39-6; (lh), 77241-88-4 [l] a-Radicals are defined as radicals in which the unpaired electron resides in an orbital with s-character (in (1J and (2) the sp2-orbital on the central nitrogen atom); cf. also W. C. Donen, Ch. T. West, J. Am. Chem. SOC. 95, 6872 (1973).

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