Tetrahedron Letters p. 7347 - 7350 (1999)
Update date:2022-08-30
Topics:
Kamaura, Masahiro
Inanaga, Junji
The fact that the lifetime of the disodium 9-fluorenone dianion is longer than that of the corresponding benzophenone dianion in refluxing THF for more than several months, which was proved by their 1H NMR analyses and also by the isolated yields of their oxidation products (parent ketones), strongly suggests using 9-fluorenone as an excellent indicator for the preparation of absolute THF.
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