9-(Tropylidenehydrazono)fluorene (1) was obtained by a reaction between 9-fluorenone hydrazone and tropylium tetrafluoroborate, accompanied by 9-fluorenone azine, 9-(benzylidenehydrazono)fluorene, and 9,9-ditropylfluorene. The amination of 1 occurred at the 2-position of the tropylidene moiety. The addition of tosyl isocyanate to 1 gave the [8 + 2] cycloadduct at the 2,4,6-cycloheptatrien-1-imine structure
THE THERMAL DECOMPOSITION OF AZINES: A NOTE ON THE THERMAL DECOMPOSITION OF BENZALDAZINE UNDER 1000 ATMOSPHERES PRESSURE OF NITROGEN, HYDROGEN AND AMMONIA
作者:Louis B. Howard、Guido E. Hilbert、R. Wiebe、V. L. Gaddy
DOI:10.1021/ja01348a020
日期:1932.9
Staudinger et al., Chemische Berichte, 1911, vol. 44, p. 2198,2203
A Fluorenyl Activating Group Enables Addition of Simple Grignard Reagents to C=N Electrophiles
作者:Gregory Hamilton、Patience Mukashyaka
DOI:10.1055/s-0037-1609551
日期:2018.9
Nucleophilic addition of organometallic reagents to ketimines and hydrazones can be a challenging transformation. Here we report the use of fluorenone-derived mixed azines which promote facile addition of Grignardreagents. The fluorenylidene activating group is easily installed and removed, thereby offering practical access to highly substituted amines and hydrazines.