Tributyltin chloride

The allylstannane 474 is prepared by the reaction of allylic acetates or phosphates with tributyltin chloride and Sml2[286,308] or electroreduction[309]. Bu-iSnAlEt2 prepared in situ is used for the preparation of the allylstannane 475. These reactions correspond to inversion of an allyl cation to an allyl anion[3l0. 311], The reaction has been applied to the reductive cyclization of the alkenyl bromide in 476 with the allylic acetate to yield 477[312]. Intramolecular coupling of the allylic acetate in 478 with aryl bromide proceeds using BuiSnAlEti (479) by in situ formation of the allylstannane 480 and its reaction with the aryl bromide via transmetallation. (Another mechanistic possibility is the formation of an arylstannane and its coupling with allylic... [Pg.353]

Ring Additions Catalyzed by Alkali Metals. The addition of tributyltin chloride and olefins such as styrene, isoprene, or butadiene to sulfolane is cataly2ed by alkah metals, including sodium and lithium, and by sodium amide (10—13). The addition of tributyltin chloride to sulfolane in the... [Pg.68]

Triorganotin compounds have also been used experimentally in controUed-release formulations to control the infective snail vector in the debiHtating tropical disease schistosomiasis (biHiarzia) and to control mosquitoes in stagnant ponds (103). As yet, the large-scale use of such methods has Htfle support in the host third world countries where these problems are most severe. Tributyltin chloride has been used to confer rodent-repeUent properties on wine and cable coatings (104). [Pg.71]

Detection and result The chromatogram was freed from mobile phase (heated to 110°C for 30 min) and then exposed to bromine vapor for 1 h in a chamber, after blowing off excess bromine from the layer it was immersed for 1 s in the reagent solution. On drying in air dibutyltin dilaurate hRf 25 — 30), dibutyltin dichloride (kR( 25 — 30), dioctyltin oxide (hR( 40), tributyltin oxide (hRf 80), tributyltin chloride (hRf 80) and tetrabutyltin (hRf 85-90) produced persistent blue zones on a yellow ochre background (Fig. 1). [Pg.399]

Fig. 1 Chromatogram of organotin compounds. Dibutyltin dilaurate (1), dibutyltin dichloride (2), dioctyltin oxide (3), tributyltin oxide (4), tributyltin chloride (5), tetrabutyltin (6).

Trapping the reaction mixture with 3.9 g (12.0 mmol) of tributyltin chloride affords, after aqueous workup and flash chromatography (silica gel, pentane/diethyl ether 20 1) a mixture of the (1Z.3/ )- and (1 ,3S)-isomers yield 2.34 g (48%). For further conversions see Section D.l.3.3.3.8.2.3. [Pg.238]

Within a commercial organotin product, there will always be some quantity of related substances in addition to the substance itself In some cases, the performance of these products relies upon the presenee of more than one related substance (e.g. mono- and disubstituted octyltin stabilizers), whereas in others, the related substances are present as an inevitable impurity. For example, tributyltin chloride will contain impurities of mono-, di-, and tetrabutyltins, as well as tin tetrachloride (Parametrix, 2002a,b). [Pg.9]

In recent in vitro studies, an aromatase inhibiting effect on human placental microsomal extracts has been demonstrated with both tributyltin chloride and dibutyltin dichloride (Heidrich et al, 2001 Cooke,... [Pg.27]

The direct and indirect assessment of the aneuploidy-inducing potency of a number of organotin compounds was reported by Jensen et al. (1991a). The effects of dimethyltin dichloride, diphenyltin dichloride, trimethyltin chloride, tributyltin chloride, and triphenyl-tin chloride at 10 -10 mol/1 on chromosomal contractions in cultures of human peripheral lymphocytes were investigated. Diphenyltin dichloride, trimethyltin chloride, tributyltin chloride, and triphenyl-tin chloride appeared to be very strong inducers of chromosomal supercontraction, indicating that these compounds induce aneuploidy, probably by affecting... [Pg.31]

Additionally, mechanisms of immunosuppression by organotins have also focused on the role of apoptosis versus proliferation arrest. The apoptotic pathway followed by organotin compormds such as dibutyltin dichloride and tributyltin chloride at high doses is... [Pg.32]

Tributyltin chloride la 399,400 Tributyltin methoxide lb 319 Tributyltin oxide la 399,400 Tricarboxylic acids la 248,249 Trichloroacetic acid la 45 -, reagent la 372,420... [Pg.496]

Tributyltin chloride also induces migration and gives the product in which the C-Sn bond is cis to the C-B bond. Protonolysis of both the C-Sn and C-B bonds by acetic acid gives the corresponding Z-alkene.35... [Pg.797]

Temperature programming packed-capillary and open capillary HTLC-ICP-MS (up to 200 °C) has been reported [738]. //.HTLC-ICP-MS instrumental coupling has been applied to organotin (tetraethyltin, tributyltin chloride and triphenyltin chloride) and organolead (tetramethyllead and tetraethyllead) compounds [756]. HTLC-ICP-MS can be used for the determination of organometallic compounds at low concentrations. The observed limit of detection (LOD) was 5pg for Pb in... [Pg.257]

Helium MIP-MS is also a very sensitive detection system for organotin compounds, such as tetraethyltin (TET), tetrabutyltin (TBT), triethyltin bromide (TET-Br), tripropyltin chloride (TPT-C1), tributyltin chloride (TBT-C1), and others, separated by CGC [213]. Detection limits at sub-pg levels were achieved, and linear dynamic ranges of at least three orders of magnitude were obtained. [Pg.624]

Tributyltin chloride Stannane, tributylchloro- (8,9) (1461-22-9) Bi (triphenylphosphine)palladium(ll) chloride Palladium, dichlorobis(1riphenylphosphine)- (8,9) (13965-03-2)... [Pg.54]

Tributyl(3-methyl-2-butenyl)tin was prepared according to the preceding procedure from 1-chloro-3-methyl-2-butene, tributyltin chloride, and magnesium. [Pg.64]

Tributlytin chloride is purchased from the Aldrich Chemical Company, Inc., and used as received. The reaction warms upon the introduction of tributyltin chloride, but it does not boil spontaneously. [Pg.187]

Magnesium turnings were purchased from Wako Pure Chemical Industries and the Aldrich Chemical Company, Inc. Tributyltin chloride was obtained from Tokyo Kasei Kogyo and the Aldrich Chemical Company, Inc. They were used without further purification. [Pg.196]

COUPLING OF ALLYLIC HALIDES WITH TRIBUTYLTIN CHLORIDE ... [Pg.198]

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