mainly from the halo-λ3-iodane intermediate; the substitution occurs as a bimolecular reaction with the external halideion while the elimination is a unimolecular (intramolecular) reaction. The intermediacy of the hypervalent λ3-iodane as well as of the iodate are also confirmed by UV spectroscopy. The secondary kinetic isotope effects, leaving group substituenteffects, and pressure effects on the
Alkenylsilanes, on treatment with iodosylbenzene activated by co-ordination of boron trifluoride–diethyl ether to the oxygen atom, give the corresponding alkynes in good to excellent yields, presumably via vinyliodine(III) intermediates.
vinylsilanes by the reaction with iodosylbenzene and triethyloxonium tetrafluoroborate. The reaction occurs stereospecifically with retention of configuration. Vinyliodonium salts are highly effective as the activated species of vinyl iodides. Thus, a variety of substituted olefins including α-cyano and α-nitro olefins, vinyl sulfides, vinylhalides, and α,β-unsaturated esters, were prepared from under mild
A NEW STEREOSELECTIVE SYNTHESIS OF VINYLSILANES UTILIZING VINYL SULFONES
作者:Masahito Ochiai、Tatsuzo Ukita、Eiichi Fujita
DOI:10.1246/cl.1983.1457
日期:1983.9.5
Vinylsilanes 3 were prepared stereoselectively from vinyl sulfones via the formation of β-tributylstannyl sulfones 2. The stereochemistry of 3 was controlled by the choice of the method for the destannylsulfonation of 2.
Stereoselective synthesis of highly labile (Z)-β-alkylvinyl(phenyl)iodonium perchlorates
作者:Masahito Ochiai、Kunio Oshima、Yukio Masaki
DOI:10.1039/c39910000869
日期:——
Labile (Z)-vinyl(phenyl)iodonium perchlorates 2(X = ClO4) were synthesised from (Z)-vinylsilanes 1 by the reaction with (diacetoxyiodo)benzene in the presence of BF3âEt2O in dichloromethane, followed by quenching with aqueous potassium perchlorate solution.