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Triethylsilane is an organosilicon compound with the chemical formula (C₂H₅)₃SiH. It belongs to the class of silanes, which are compounds featuring a silicon-hydrogen bond along with organic substituents attached to the silicon atom. Three ethyl groups (C₂H₅) are bonded to the silicon atom, leaving one hydrogen atom directly attached, making it a useful reagent in various chemical reactions.
One of the primary applications is as a reducing agent in organic synthesis. It can selectively reduce functional groups such as carbonyl compounds (aldehydes and ketones) to their corresponding alcohols. This reduction is often carried out under mild conditions, making it a valuable tool in the synthesis of complex organic molecules.
Moreover, it is known for its relatively low toxicity and ease of handling compared to some other reducing agents. It is also used in the formation of silicon-carbon bonds through hydrosilylation reactions, where the Si-H bond reacts with unsaturated organic compounds.
Overall, it plays a significant role in organic chemistry, offering versatility and efficiency in synthetic transformations.
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Chemical Formula |
C6H16Si |
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Exact Mass |
296 |
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Molecular Weight |
296 |
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m/z |
116 (100.0%), 117 (6.5%), 117 (5.1%), 118 (3.3%) |
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Elemental Analysis |
C, 61.98; H, 13.87; Si, 24.15 |
Reducing Agent
Mild Reducing Properties
It is frequently used as a mild reducing agent due to its availability, convenient physical properties, and economy relative to other organosilicon hydrides. It can reduce certain functional groups in organic compounds, such as ketones, aldehydes, acids, and others, to synthesize specific organic compounds.
Silylcyanation Reactions
Triethylsilyl cyanide, used for the silylcyanation of aldehydes and ketones, can be prepared from it (Et3SiH) and acetonitrile in the presence of catalytic amounts of Cp(CO)2FeMe.
Reduction of Oxides
In reactions like the Fukuyama reduction, it can reduce thioesters to aldehydes at room temperature. It is also effective in reducing tertiary alcohols, benzyl alcohols, or aryl aldehydes and ketones to alkanes. Common reagent combinations include Et3SiH/TFA, Et3SiH/BF3, and Et3SiH/B(C6F5)3.
Catalyst in Hydrosilylation Reactions
Hydrosilylation of Carbonyl Compounds
Several metal complexes, such as ruthenium, chromium, and rhodium, catalyze the hydrosilylation of various carbonyl compounds by it. Stereoselectivity is observed in the hydrosilylation of ketones.
Regioselective 1,4-Hydrosilylation
Triethylsilane and chlorotris(triphenylphosphine)rhodium(I) catalyst effect the regioselective 1,4-hydrosilylation of α,β-unsaturated ketones and aldehydes. For example, the reduction of mesityl oxide in this manner results in a 95% yield of product that consists of 1,4- and 1,2-hydrosilylation isomers in a 99:1 ratio.
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Synthesis of Triethylsilyl Reagents
Bromotriethylsilane: Bromotriethylsilane is prepared when Et3SiH reacts with copper bromide and catalytic amounts of copper iodide or with PdCl2 and allyl bromide.
Reduction of Bu3SnCl: Et3SiH can reduce Bu3SnCl to Bu3SnH, which, when carried out in the presence of alkynes, allenes, or alkenes, can undergo Lewis acid-promoted hydrostannation reactions. This represents the first example of Lewis acid-catalyzed hydrostannations with in situ generated tributyltin hydride.
Dichloroindium Hydride: Et3SiH reacts with indium(III) chloride to generate dichloroindium hydride.
Organic Synthesis
Synthesis of Organic Silicon Compounds: It is used in the synthesis of various organic silicon compounds. It can be prepared from triethylchlorosilane using lithium hydride or lithium aluminum hydride as reducing agents.
Protection and Deprotection: It is used in protection and deprotection strategies in organic synthesis, particularly in the presence of acid or base.
Protection Strategy
In organic synthesis, protecting groups are often used to temporarily mask reactive functional groups, preventing them from participating in unwanted reactions. It can be employed in such protection strategies, especially when working with acid- or base-sensitive compounds. By introducing a triethylsilyl (TES) group, the reactivity of certain functional groups can be significantly reduced, allowing for selective reactions elsewhere in the molecule.
Deprotection Strategy
Once the desired transformations have been completed, the protecting group needs to be removed in a process known as deprotection. It can play a role in deprotection strategies as well. Under specific conditions, such as the presence of acid or base, the TES group can be cleaved, restoring the original functionality of the molecule.
Acid or Base Sensitivity
The reactivity in protection and deprotection strategies is particularly useful when working with acid- or base-sensitive compounds.
Selectivity
The use as a protecting group can enhance the selectivity of organic reactions by masking unwanted reactive sites.
Versatility
The versatility extends to various organic synthesis applications, making it a valuable tool in the chemist's toolbox.
One example of the use in protection and deprotection strategies is in the synthesis of complex organic molecules where specific functional groups need to be preserved while others are modified. By introducing a TES group to protect a sensitive functional group, chemists can carry out subsequent reactions with greater control and selectivity. Once the desired transformations are complete, the TES group can be removed under appropriate conditions, restoring the original functionality of the molecule.
Surface Treatment
When using triethylsilane as a surface treatment agent, it's important to consider its reactivity and sensitivity to moisture. Which is known to react with moisture, releasing hydrogen gas, so it should be handled and stored under dry conditions. Additionally, proper surface preparation and application techniques are crucial to ensure effective modification of the material's surface properties.
Increased Hydrophilicity
By applying it to a material's surface, the surface can become more hydrophilic, meaning it attracts and retains water more easily. This property can be particularly useful in applications where improved wetting or moisture absorption is desired.
Enhanced Adhesion
It can also improve the adhesion properties of a material's surface. This is beneficial in applications where strong bonding between different materials is required, such as in coatings, adhesives, or composites.
Versatility
The ability to modify surface properties makes it a versatile tool in various industries, including materials science, electronics, and biomedical engineering.
The history dates back to the early 20th century when research into organosilicon compounds was gaining momentum. It was first synthesized as part of these explorations into the properties and applications of silicon-based chemicals. Since then, it has become a staple in organic chemistry laboratories due to its versatility and reactivity.
The primary use is as a reducing agent in organic synthesis. It is particularly effective in reducing certain functional groups, such as ketones, aldehydes, and acids, to form specific organic compounds. This property makes it invaluable in the synthesis of pharmaceuticals, silicones, and other specialty chemicals. The compound's ability to undergo hydrosilylation reactions, where it adds silicon atoms to organic molecules, further expands its utility in organic chemistry.
Over the years, researchers have studied various aspects, including its reactivity, selectivity, and stability. For instance, the compound's reactivity can be influenced by the presence of catalysts, which can alter the outcome of hydrosilylation reactions. Studies have also focused on improving the selectivity of these reactions, aiming to produce specific products with high yields and minimal by-products.
In addition to its role as a reducing agent, it has found applications in surface treatment, where it is used to modify the properties of material surfaces, such as increasing their hydrophilicity or adhesiveness. This versatility has made it a valuable tool in materials science and engineering.
Despite its widespread use, it is considered to have low toxicity. However, direct contact with the skin and eyes should be avoided as it may cause irritation. Inhalation of the vapors can irritate the respiratory system, causing coughing or discomfort in the throat. Proper handling and storage procedures are essential to ensure the safety of those working with the compound.
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