Di-n-butyltin oxide

The lower trialkyltin hydroxides and oxides, which are usually readily interconverted, have been characterized by IR and Mossbauer spectroscopy (212). The dimer of di-n-butyltin oxide (Bu2SnO)2 has been reported to be formed as a crystalline solid when dibutyltin dichloride is hydrolyzed with ammonium hydroxide (213). 

IPOS (2005) International Chemical Safety Card — Di-n-butyltin oxide. Geneva, World Health Organization, International Programme on Chemical Safety (ICSC 0256 http //www.ilo.org/ public/english/protection/safework/cis/products/icsc/dtasht/ icsc02/icsc0256. htm). 

Schering AG (1999b) Growth inhibition test of di-n-butyltin oxide (ZK 26385) on the green algae, Scenedesmus subspicatus. Berlin, Schering AG, 17 February (Research Report No. IC28). 

Martinelli, M. J. Vaidyanathan, R. VanKhau, V., Selective monosuUbnylation of internal 1,2-diols catalyzed by di-n-butyltin oxide. Tetrahedron Lett 2000,41, 3773-3776. 

Additional hyperbranched polyesters based on either di-, tri-, or polycarboxylic acids or di-, tri-, or polyols are described by Bruchman et al. (1). For example, the reaction product of adipic acid, pentaerythritol and 1,4-cyclohexanedi-methanol, was prepared using di-n-butyltin oxide as catalyst and then post-reacted with selected diisocyanates and used as a paint additive. 

ESTERS N,N-Bis(2-oxo-3-oxazolidinyI)-phosphordiamidic chloride. Coppcr(II) acetate. Di-n-butyltin oxide. 

LACTAMS Di-n-butyltin oxide. Ily-droxylamine-O-sulfonic acid. Iodine azide. Sodium eyanoborohydride. (3-LAC TAMS Cyanuric chloride. Grignard reagents. Ion-exchange resins. Lithium phenylethynolate. Sodium dicarbonyl-cyclopentadienylferrate. Titanium(lll) chloride. Titanium(IV) chloride. Tri-phenylphosphino-Carbon tetrachloride. Triphenylphosphine-Die thyl azodicar-boxylate. Triphenylphosphine-2,2 -Dipyridyl disulfide. 

LACTONES Bis(3-dimethylaminopro-pyDphenylphosphine. Copper(I) tri-fluoromethanesulfonate. Di-n-butyltin oxide. Dichlorobis(triphenyl-phosphine)-palladium. Ruthenium tetroxide. a-LACTONES lodosobenzene. 

Iron(ll) sulfate. CopperO) trifluoro-methylsulfonatc. Cyanuric chloride. Di-n-butyltin oxide. N-Methyl-N-phcnylaminocthynyllithium. Oxygen, singlet. 

Dehydrosulfuration.1 Primary thioamides arc converted into nitriles by reaction with 1 (or di-n-butyltin oxide) in refluxing benzene (75-98% yield). 

Monoetherification of polyols.12 Monobenzylation and monoallylation of polyols can be conducted conveniently under mild conditions by conversion to the stannylene derivative (dimeric) by di-n-butyltin oxide (5, 189 9, 141). The stannylene is then treated with benzyl bromide or allyl bromide and tetra-n-butylammonium iodide (1 equiv.) in benzene. The same conditions can be used to prepare monomethoxymethyl ethers. Quaternary ammonium bromides are less efficient catalysts than the iodides. These salts also accelerate reaction of stannylenes with acid anhydrides. The mechanism for this activation is not clear it may involve coordination of I" to tin. 

The method is useful for synthesis of five-, six- and seven-membered lactams, but not of P-lactams or macrolactams. The bridged lactam 2 was obtained from 1 in 77% yield by reaction with di-n-butyltin oxide. 

Macrolides (10, 124).1 The tin-mediated lactonization of to-hydroxy carboxylic acids is particularly useful for formation of 13- to 17-membered macrolides. Highest yields are obtained when di-n-butyltin oxide is used in stoichiometric amounts. The method is not useful for macrocyclization of ca-bromo or ca-mercapto carboxylic acids. 

Di-r-butyl-4-methylpyridine, 141, 485 Di-/-butylmethylsilyl perchlorate, 78 Di-n-butyltin oxide, 141... 

SYNS DBOT DIBUTYLOXIDE of TIN DIBUTYLOXOTIN DIBUTYLSTANNANE OXIDE DIBUTYLTIN OXIDE DI-n-BUTYLTIN OXIDE Dl-n-BUTYDZINN-OXYD (GERMAN) KYSUCNIK Dl-n-BUTYLCINICITY (CZECH)... 

DIBUTYLTIN METHYL MALEATE see BKO250 DIBUTYLTIN OXIDE see DEF400 DI-n-BUTYLTIN OXIDE see DEF400 DIBUTYLTIN SULFIDE see DEI200... 

In contrast, the condensation product of salicylaldoxime (o-HO-N=CH-C6H4-OH) with di- -butyltin oxide crystallizes in a 2 3 molar ratio, independently of the molar ratio, 1 1, 2 3, or 1 2, with which salicylaldoxime and di-n-butyltin oxide are allowed to react. X-ray structure determination enabled the elucidation of the solid state structure (Figures 14 and 19) of this compound (1) [17]. 

For the condensation complexes of salicylaldoxime and di-n-butyltin oxide, the 2D H- Sn HMQC experiments proved to be especially powerful for the structural characterization of the different tin clusters existing in solution. Indeed, the numerous long-range correlation peaks (up to five bonds) observed in the 2D spectra allowed one to propose a structure for each of the species. Furthermore, our results clearly evidence that weak scalar couplings through coordinative N->Sn and O- Sn bonds can be observed. 

Di-n>butyltin oxide [818-08-6] M 248.9, m >300 . It is prepd by hydrolysis of di-n-butyltin dichloride with KOH. Hence wash with a little aq M KOH then H2O and dry at -80 /10mm until the IR is free from OH bands. [Cummings Aust J Chem 18 98 1965.]... 

Monoderivatives of symmetrical diols.2 One possible route to these derivatives is treatment of the diol with di-n-butyltin oxide to form a stannoxane, which is then allowed to react with 1 equivalent of an acid chloride or sulfonyl chloride (equation I). Unsymmetrical diesters can be obtained by consecutive reaction of the stannoxane with two different reagents. 

Macrolides. Steliou, Hanessian, and co-workers3 have prepared lactones and lactams in moderate to excellent yield by treatment of m-hydroxy or oj-amino carboxylic acids with catalytic amounts of di-n-butyltin oxide in refluxing mesitylene or xylene in a Dean-Stark apparatus for 12-24 hours. The method has the advantage of high dilution, since the tin reagent is regenerated continuously. As expected, yields are low for medium-sized rings. 

BRN 4126243 DBOT Di-n-butyl-zinn-oxyd Di-n-butyltin oxide Dibutyloxide of tin Dibutyloxostannane Dibutyloxotin Dibu lstannane oxide Dibutylstannium oxide Dibutyltin oxide EINECS 212-449-1 Kyslicnik di-n-butylcinicity NSC 28130 Stannane, dibutyloxo- Tin, dibutyl-, oxide Tin, dibutyloxo-. 

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