Organotin compounds acetates

Another major use of organotin compounds is as curing agents for the room temperature vulcanization of silicones the 3 most commonly used compounds are Bu2SnX2, where X is acetate, 2-ethylhexanoate or laurate. The same compounds are also used to catalyse the addition of alcohols to isocyanates to produce polyurethanes. 

Thiol compounds 252, 254 Thione compounds 252, 254 Thiosemicarbazides, N-aryl- 248 Thiourea 107, 246,254, 269, 337 -, derivatives 322, 323 Thorium cations 144 Threonine 246 Thymol 153, 197, 198 -, derivatives 288 Tigogenin 59, 195 -, acetate 63 Tigogenone 59,60 Tillmans reagent 256 Tin, cations 144,311,398 -, organic derivatives see Organotin compounds... 

Although this method is not a general procedure, being specific for a-nitroketones, it has several merits to avoid the use of toxic reagents such as organotin compounds. Functionalized ketones have been prepared by this denitration reaction, in which functionalized nitroalkanes are used as alkyl anion synthons. For example, 3-nitropropanal ethylene acetal can be used as synthon of the 3-oxo-propyl anion and 1,4-dicarbonyl compounds are prepared, as shown in Eq. 7.88.135... 

In sludge anionic and non-ionic surfactants carboxylic acids hhydroxybutyrate hydroxy valerate chloroaliphatic compounds chlorophenols polychlorobiphenyls 4-nitrophenol mixtures of organic compounds chlorinated insecticides, phenoxy acetic acid type herbicides and organotin compounds. 

Recently, an alternative synthesis route has been described that prevents the use of both the expensive and moisture-sensitive Re207 as well as of the toxic organotin compounds. This route uses acetyl perrhenate as the rhenium source and methylzinc acetate as the methylating agent. Acetyl perrhenate can be obtained by treatment of... 

Organotin compounds have also been separated by this mode of chromatography [48,70]. In the former study [48], cation exchange was compared to IPC and was found to give a superior linear dynamic range for the separation of tetramethyltin chloride, tetrabutyltin chloride, and tetraphenyltin chloride. In the latter study [70] a mobile phase of 0.30 M ammonium acetate in 60 40 methanol/water with a pH gradient of 6 to 3 in 1 min was used successfully to resolve tetrabutyltin and dibutyltin. 

The stemona alkaloid stemonamide (49) was synthesized starting from a-stannyl acetate 47 and 2-stannyl pyrrolidine 48. The oxidative coupling of stannyl acetate 47 with acetylenic silyl enol ether affords the functionalized C-7 unit which corresponds to the side arm of the pyrrolidine ring. Then, introduction of the C-7 unit to the pyrrolidine ring is performed by the oxidative generation of acyliminium ion. The carbon skeleton of stemonamide was thus constructed efficiently as shown in Scheme 19 by employing organotin compounds. ... 

Organotin compounds with tin-sulfur bonds are useful for the transformations of alkyl halides to sulfides (eq (119)) [114], esters to thiolesters (eq (120)) [115], and acetals to monothioacetals (eq (121)) [116]. 

Since the various trialkylstannylmetals are available, their reactions with electrophiles provide a convenient methods for the preparation of organotin compounds. Substitutions of alkyl halides, tosylates, acetates, and sulfides with suitable stannyl-metals afford a variety of letraorganotin compounds (eq (136)) [131]. 

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