Tetrahedron Letters p. 817 - 820 (1984)
Update date:2022-08-03
Topics:
Mattay, Jochen
Gersdorf, Joachim
Freudenberg, Ulrich
The thermal and photochemical reactions of biacetyl 1 and 1,1-diethoxyethene 2 are totally complementary: 1 and 2 exclusively form the 2,2-diethoxyoxetane 4 in polar solvents at room temperature.Contrary to the literature this thermal cycloaddition proceeds uncatalyzed. 1 and 2 react photochemically under exclusive formation of the regioisomer oxetane 3 - preferably in nonpolar solvents.The inversion ("Umpolung") of the reactivity of 1 is caused by the photoinduced electron transfer.
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