The cell was immersed in liquid nitrogen. (4) When the radical was purified carefully by distillation, cooling of the radical solution did not bring about the significant change of the spectrum for the region shorter than 400 nm (Figure 1a and 1b), and the absorption intensity in 650-nm region at 77°K is smaller than that reported previously.2 Addition of a metal halide to the solution sometimes results In an increase of the intensity at around 610 nm with the spectral change In the shorter region. For example, Xma, (e) for 1a in MTHF with lithium Iodide at 77°K is 618 nm (4800) at the concentration of 4.7 X 10-3 M. This is explained by the complex formation of 1a with lithium iodide.1 (5) R.

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2‐Carbäthoxy‐indol (I) liefert mit Phenylmagnesiumbromid das Carbinol (II), das bei der sauren Methanolyse über (III) in Äther (IV) übergeht.