Annulation selectivity in the coupling of Fischer carbene complexes with o-alkynylbiphenyl and o-alkynylstyrene derivatives
作者:Thaddeus J Jackson、James W Herndon
DOI:10.1016/s0040-4020(01)00227-7
日期:2001.4
The coupling of various Fischercarbenecomplexes with o-ethynylbiphenyl and an o-alkynylstyrene derivatives has been examined. In coupling reactions with methylcarbene and cyclopropylcarbene complexes, the major products are derived from C–H or C–C activation processes. In coupling reactions with phenylcarbene complexes, the major products are derived from the Dötz reaction.
Synthesis of dibenzo[<i>a</i>,<i>d</i>]cycloheptanoids <i>via</i> aryne insertion into 2-arylidene-1,3-indandiones
作者:Nagaraju Payili、Santhosh Reddy Rekula、Anjaiah Aitha、V. V. S. R. N. Anji Karun Mutha、Challa Gangu Naidu、Satyanarayana Yennam
DOI:10.1039/c9ob01900f
日期:——
A novel and unexpected aryne insertion cascade reaction on 2-arylidene-1,3-indandiones via conjugate addition of fluoride followed by formal C-C insertion is developed to afford dibenzo[a,d]cycloheptanoid derivatives in good yields with a single isomer. This reaction represents a rare instance of cyclic enone C-C bond insertion (acyl-alkenylation) in aryne chemistry. Interestingly, 2-arylidene-1,3-indandiones
Display devices are described which include at least one positive and at least one negative electrode and an electrochemical solution containing a suitable organic solvent, an active material containing species which change color under the influence of an electrical signal, and an electrolyte, the improvement residing in the use of organic quinones or diodes as the said active material. These devices exhibit high optical contrast, pleasing and striking colors and unusually low power consumption. Particularly advantageous is the fact that these display devices may exhibit non-linear behavior (sharp thresholds) which permit multiplexing. This is highly advantageous in display device applications.