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Chemical compound From Wikipedia, the free encyclopedia
Tetramethyltin is an organometallic compound with the formula (CH3)4Sn. This liquid, one of the simplest organotin compounds, is useful for transition-metal mediated conversion of acid chlorides to methyl ketones and aryl halides to aryl methyl ketones. It is volatile and toxic, so care should be taken when using it in the laboratory.
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Names | |||
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Preferred IUPAC name
Tetramethylstannane[1] | |||
Other names
Tin tetramethyl | |||
Identifiers | |||
3D model (JSmol) |
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3647887 | |||
ChEBI | |||
ChemSpider | |||
ECHA InfoCard | 100.008.941 | ||
EC Number |
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1938 | |||
PubChem CID |
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RTECS number |
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UNII | |||
UN number | 3384 | ||
CompTox Dashboard (EPA) |
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Properties | |||
C4H12Sn | |||
Molar mass | 178.850 g·mol−1 | ||
Appearance | Colorless liquid | ||
Density | 1.291 g cm−3 | ||
Melting point | −54 °C (−65 °F; 219 K) | ||
Boiling point | 74 to 76 °C (165 to 169 °F; 347 to 349 K) | ||
Hazards | |||
GHS labelling: | |||
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Danger | |||
H225, H300, H310, H330, H410 | |||
P210, P233, P240, P241, P242, P243, P260, P262, P264, P270, P271, P273, P280, P284, P301+P310, P302+P350, P303+P361+P353, P304+P340, P310, P320, P321, P322, P330, P361, P363, P370+P378, P391, P403+P233, P403+P235, P405, P501 | |||
NFPA 704 (fire diamond) | |||
Flash point | −12 °C (10 °F; 261 K) | ||
Related compounds | |||
Related tetraalkylstannanes |
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Related compounds |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Tetramethyltin is synthesized by reaction of the Grignard reagent methylmagnesium iodide, with tin tetrachloride,[2] which is synthesized by reacting tin metal with chlorine gas.[3]
In tetramethyltin, the metal surrounded by four methyl groups in a tetrahedral structure is a heavy analogue of neopentane.
Tetramethyltin is a precursor to trimethyltin chloride (and related methyltin halides), which are precursors to other organotin compounds. These methyltin chlorides are prepared via the so-called Kocheshkov redistribution reaction. Thus, (CH3)4Sn and SnCl4 are allowed to react at temperatures between 100 °C and 200 °C to give (CH3)3SnCl as a product:
A second route to trimethyltin chloride utilizing tetramethyltin involves the reaction of mercury(II) chloride to react with (CH3)4Sn.[2]
A variety of methyltin compounds are used as precursors for stabilizers in PVC. Di- and trimercaptotin compounds are used to inhibit the dehydrochlorination, which is the pathway for photolytic and thermal degradation of PVC.[3]
Tetramethyltin decomposes in the gas phase at about 277 °C; (CH3)4Sn vapor reacts with silica to give a (CH3)3Sn-grafted solid.
This reaction is also possible with other alkyl substituents. In a similar process, tetramethyltin has been used to functionalize certain zeolites at temperatures as low as −90 °C.[4]
In organic synthesis, tetramethyltin undergoes palladium-catalyzed coupling reactions with acid chlorides to give methyl ketones:[5]