Ward, J. Am. Chem. Soc., 94, 552 (1972). (11) The carboxyl inversion product (4b) is formed in 18% yield but does not exhibit CIDNP in either the 1 *H or ,3C NMR. This supports a nonradical mechanism for formation of this product. Furthermore, 4b is stable under the reaction conditions and is thus not a precursor of 3b or 5-7. The relative yields of 3b and 5-7 are also insensitive to the concentration of 1b (0.045-0.5 M) and to the addition of excess m-chlorobenzoic acid (saturated in ODCB at 0.2 M). This makes it unlikely that either induced decomposition or acid promoted ionization of 1b contribute significantly to the reaction under these conditions. (12) (a)
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