Aluminum carbenoids in the cyclopropanation of fulvenes
作者:I. R. Ramazanov、A. V. Yaroslavova、N. R. Yaubasarov、U. M. Dzhemilev
DOI:10.1007/s11172-018-2096-5
日期:2018.3
Et2AlCH2I reacts with 6-substituted fulvenes to give tricyclopropanes in high yields. Calculations at the B3LYP/6-31G(d) level of theory show that coplanar arrangement of the double bonds facilitates cyclopropanation due to conjugation in the transition state. Aluminum carbenoid Et2AlCH2I was generated by either the reaction of equimolar amounts of Et3Al and CH2I2 in hexane or treatment of Et2AlI with CH2N2
Dimethyldioxirane epoxidation of 6,6-disubstituted fulvenes.
作者:Waldemar Adam、Lazaros P. Hadjiarapoglou、Anja Meffert
DOI:10.1016/s0040-4039(00)93578-0
日期:1991.11
The endocyclic bis-epoxides of various pentafulvenes were readily prepared by epoxidation with excess dimethyldioxirane; stoichiometric epoxidation yielded mixtures of the bis-epoxides and the labile mono-epoxides, but no exocyclic epoxides were observed.
Cyclopropylcarbinyl ring opening as mechanistic probe for differentiation between the singlet and triplet spin states of trimethylenemethane diradicals (non-Kekule species)
作者:Waldemar Adam、Ralf Finzel
DOI:10.1021/ja00038a018
日期:1992.6
The cyclopropylcarbinyl rearrangement of the non-Kekule 2-alkylidene-1,3-cyclopentanediyl diradical (S-2b and T-2b), generated by thermal and direct and triplet-sensitized photochemical denitrogenation of the corresponding azoalkane 1b, was explored. While in the triplet-sensitized photolysis at moderate temperatures no cyclopropylcarbinyl rearrangement took place, in the singlet manifold (thermolysis
Reaction of diazoalkanes with unsaturated compounds. Communication 2. Cyclopropanation of olefins by diazomethane in the presence of palladium compounds
作者:Yu. V. Tomilov、V. G. Bordakov、I. E. Dolgii、O. M. Nefedov
DOI:10.1007/bf00995691
日期:1984.3
Sulfur ylides. 4. Cyclopropanation of fulvenes by ethyl (dimethylsulfuranylidene)acetate under interphase catalysis conditions
作者:G. A. Tolstikov、F. Z. Galin、V. N. Iskandarova、S. N. Lakeev、L. V. Spirikhin、L. M. Khalilov
DOI:10.1007/bf00962390
日期:1990.6
The reaction was studied of fulvenes with ethyl (dimethylsulfuranylidene)acetate generated under interphase catalysis conditions from the sulfonium salt [MeS+CH2-CO2Et)]Br- by the action of 85% KOH in the presence of triethylbenzylammonium chloride.