Catalytic [6π+2π]-cycloaddition of Si-containing alkynes to 7-substituted 1,3,5-cycloheptatrienes under the action of Ti(acac)2Cl2–Et2AlCl
作者:Vladimir A. D'yakonov、Gulnara N. Kadikova、Dmitriy I. Kolokol'tsev、Ilfir R. Ramazanov、Usein M. Dzhemilev
DOI:10.1016/j.jorganchem.2015.06.006
日期:2015.10
two-component Ti(acac)2Cl2–Et2AlCl system, resulting in the formation of substituted bicyclo[4.2.1]nona-2,4,7-trienes in high yields, was accomplished. The structures of the obtained compounds were confirmed by 1H, 13C NMR spectroscopy. The reaction mechanism was studied through quantum chemical modeling of the cycloheptatriene and acetylene interaction with TiCl4–Et2AlCl system at the B3LYP/6-31G(d) level
Titanium-Catalyzed [6π+2π]-Cycloaddition of Alkynes and Allenes to 7-Substituted 1,3,5-Cycloheptatrienes
作者:Vladimir A. D'yakonov、Gulnara N. Kadikova、Dmitry I. Kolokol'tsev、Ilfir R. Ramazanov、Usein M. Dzhemilev
DOI:10.1002/ejoc.201500442
日期:2015.7
5-cycloheptatrienes with alkynes and allenes, catalyzed by the two-component Ti(acac)2Cl2–Et2AlCl system, resulting in the formation of substitutedbicyclo[4.2.1]nona-2,4-dienes and bicyclo[4.2.1]nona-2,4,7-trienes in up to 90 % yield, was accomplished. The structures of the obtained compounds were confirmed by X-ray diffraction and by 1H and 13C NMR spectroscopic analysis.
Regioselective [6π+2π] cycloaddition of 1,2-dienes to 7-substituted 1,3,5-cycloheptatrienes catalyzed by Ti(acac)2Cl2—Et2AlCl
作者:G. N. Kadikova、D. I. Kolokoltsev、E. S. Meshcheryakova、V. A. D’yakonov、U. M. Dzhemilev
DOI:10.1007/s11172-016-1283-5
日期:2016.1
A reaction of 7-alkyl-, 7-allyl-, 7-phenyl-1,3,5-cycloheptatrienes with 1,2-dienes in the presence of the two-component catalytic system Ti(acac)2Cl2—Et2AlCl, which led to the formation of practically important substituted endo-bicyclo[4.2.1]nona-2,4-dienes in up to 90% yields, was accomplished for the first time.
unsubstituted, methyl-, ethyl-, isopropyl-, t-butyl-, triphenylmethyl-, and phenyltropylium ions with Cr(II) in a 10% HCl solution gives, quantitatively, the dimer of the corresponding substituted tropyl radical. The measurements of the reaction rate at 25°C exhibit this order of reactivity: t-butyltropylium (k2=7.98 l/g·ion·sec), isopropyltropylium (8.22), ethyltropylium (10.3), methyltropylium (11.1), tropylium
Reactions of Cyclic C<sub>7</sub>H<sub>6</sub>-System: Reactions of a Tautomer of Cycloheptatetraene and Cycloheptatrienylidene with Tropone, Heptafulvene, and 1,3,5-Cycloheptatriene Derivatives
Reactions of a cyclic C7H6-system, a tautomer of 1,2,4,6-cycloheptatetraene and 2,4,6-cycloheptatrienylidene, with tropone derivatives and 8,8-dicyanoheptafulvene afforded exo-[4π+2π] cycloadducts. Similar reactions with 1,3,5-cycloheptatriene derivatives gave exo-[6π+2π] cycloadducts. These reactions are considered to proceed through zwitter ionic intermediates containing tropylium ion moieties.