Maier, Guenther; Schick, Andreas; Bauer, Ines; Boese, Roland; Nussbaumer, Michael:
Small rings. 74. Hexa-tert-butyl-3,3'-bicyclopropenyl.
In: Chemische Berichte (Chem.Ber.), Jg. 125 (1992), Heft 9, S. 2111 - 2117
1992Artikel/Aufsatz in Zeitschrift
Small rings. 74. Hexa-tert-butyl-3,3'-bicyclopropenyl.
Maier, Guenther; Schick, Andreas; Bauer, Ines; Boese, RolandLSF; Nussbaumer, Michael


Title compd. (I) was prepd. by reductive coupling of tri-tert-butylcyclopropenylium tetrafluoroborate (II) with Li. Upon treatment with AgBF4 I does not undergo valence isomerization to the Dewar form of hexa-tert-butylbenzene but is reoxidized to substrate II. The photochem. behavior of RCON:NR, prepd. by treating II with Me3SiCLiN2, is also unusual. Irradn. at room temp. results in gas evolution, however, instead of R2CO, RCOCOR is isolated. R2CO is only formed if RCON:NR is irradiated in an org. matrix at -196 Deg.