2943-86-4Relevant academic research and scientific papers
Reactions of (triethylstannylthioalkyl)trialkoxysilanes and (triethylstannylthioalkyl)trialkoxysilatranes with methyl iodide
Sorokin,Voronkov
experimental part, p. 2056 - 2060 (2009/04/13)
Reactions of (triethylstannylthioalkyl)trimethoxysilanes Et 3SnS(CH2)nSi(OMe)3 (n = 1, 2) and (triethylstannylthioalkyl)trialkoxysilatranes Et3Sn(CH2) n Sa [hereinafter Sa = Si(O
Homolytic addition of polyhaloalkanes to α-vinyloxy-ω-trialkylstannoxyalkanes as a new route to 2-perhaloalkylmethyl-substituted 1,3-dioxacyclanes
Arbuzov, P. V.,Voronkov, M. G.,Mirskov, R. G.,Stankevich, V. K.,Kukharev, B. F.,et al.
, p. 1755 - 1757 (2007/10/03)
Photoinduced reactions of α-vinyloxy-ω-trialkylstannoxyalkanes, CH2=CHO(CH2)nOSnEt3 (n = 2 to 4), with polyhaloalkanes results in 2-perhaloalkylmethyl-substituted 1,3-dioxacyclanes. - Key words: α-vinyloxy-ω-trialkylstannoxyalkanes, polyhaloalkanes, photoinduced reactions; 1,3-dioxacyclanes.
Substituent effects in aromatic substitution of aryltriethyltin compounds by mercuric halides
Sedaghat-Herati, M. Reza,Sharifi, Taghi
, p. 39 - 44 (2007/10/02)
Second-order rate constants are reported for the reaction of some YC6H4SnEt3 compounds with mercuric halides in tetrahydrofuran, and show that the reaction is one of low selectivity.The substituent effects can be correlated only in terms of Hammett ?-constants, and the data for the meta-methoxy group are anomalous.The results indicate that the rate determining step involves reaction of a ?-complex.Activation parameters are reported, and are in accordance with the suggested mechanism.
REACTIONS OF ORGANOMETALLIC COMPOUNDS CATALYZED BY TRANSITION-METAL COMPLEXES. XV. PRODUCTION OF THIOCARBOXYLIC S-ESTERS BY CATALYTIC CARBONYLATION OF ARYL IODIDES AND TRIETHYLTIN THIOLATES
Gulevich, Yu. V.,Bumagin, N. A.,Beletskaya, I. P.
, p. 1918 - 1923 (2007/10/02)
Carbonylation in the aryl iodide-triethyltin thiolate system, catalyzed by bis(triphenylphosphine) palladium, was studied.In the case of unactivated aryl iodides containing weak electron-withdrawing substituents thiocarboxylic S-esters are formed with satisfactory yields.The reactions of aryl iodides containing strong electron-withdrawing groups lead mainly to the products from cross-coupling, i.e., unsymmetrical sulfides.The mechanism of the catalytic action of the phosphine complex of palladium was investigated.
SUBSTITUTION AT SATURATED CARBON. PART 25. THE IODODEMETALLATION OF BENZYLTRIALKYLTINS IN METHANOL
Abraham, Michael H.,Andonian-Haftvan, Jenik
, p. 819 - 830 (2007/10/02)
The action of I2/I- in methanol on compounds PhCH2SnR3 leads only to cleavage of the benzyl group (as PhCH2I) when R=Et, Prn or Bun.With PhCH2SnMe3, both benzyl and methyl groups are removed.Rate constants are reported for the iododemetallation of all four PhCH2SnR3 compounds, R=Me, Et, Prn and Bun.The present results and previous literature data show that with a constant SnR3 leaving group, the sequence of alkyl-tin reactivity is Ph>PhCH2>Me>Et>Prn, with the benzyl-tin bond being broken 3-4 times as rapidly as the methyl-tin bond and about 40 times as rapidly as the ethyl-tin bond.The effect of added anions, Cl-, Br-, I- and ClO4- on the rate constants (and products) are reported, and it is shown that both kinetic studies and product analyses lead to the conclusion that foreign anions do not participate in the reaction mechanism.These are, however, specific kinetic salt effects in the order NaBrNaClNaClO4NaI.
METAL-HALOGEN BONDING STUDIES WITH GROUP IV A TRIALKYLMETAL HALIDES
Friedrich, Edwin C.,Abma, Charles B.,Vartanian, Paul F.
, p. 203 - 212 (2007/10/02)
Halogen redistribution reactions have been found to take place between benzyl bromide or benzyl iodide and the Group IV A silicon, germanium, tin, and lead containing trialkylmetal chlorides.However, for the reactions of the Si, Ge and Sn compounds, a quaternary ammonium halide catalyst was necessary to enable the equilibria to be established at reasonably rapid rates.The equilibrium constants at 50 deg C have been measured for each of these halogen redistributions.They have been found to increase gradually on going down in Group IV A from silicon to lead, being conside rably less than unity in the case of silicon and somewhat greater than unity in the case of lead for both the R3MCl + BzBr and R3MCl + BzI reactions.The ΔG0 values for these equilibria have been calculated, and it is suggested that their differences may be explained in terms of the relative importance of p?-d? contributions to the halogen-metal bonding in the various Group IV A trialkylmetal halide systems.
