Trimethylsilylketene Property

Boiling point:

80-82 °C(lit.)

Density 

0.813 g/mL at 25 °C(lit.)

refractive index 

n20/D 1.413(lit.)

Flash point:

3 °F

solubility 

Sol CH2Cl2, CHCl3, CCl4, THF, diethyl ether, and most standard organic solvents; reacts with alcoholic and amine solvents.

EPA Substance Registry System

Ethenone, (trimethylsilyl)- (4071-85-6)

Safety

Hazard Codes 

F

Risk Statements 

11

Safety Statements 

7/9-16-29-33

RIDADR 

UN 1993 3/PG 2

WGK Germany 

3

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H225Highly Flammable liquid and vapour

Precautionary statements

P210Keep away from heat/sparks/open flames/hot surfaces. — No smoking.

P233Keep container tightly closed.

P240Ground/bond container and receiving equipment.

P241Use explosion-proof electrical/ventilating/lighting/…/equipment.

P242Use only non-sparking tools.

P243Take precautionary measures against static discharge.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.

P370+P378In case of fire: Use … for extinction.

P403+P235Store in a well-ventilated place. Keep cool.

P501Dispose of contents/container to..…

Trimethylsilylketene Chemical Properties,Usage,Production

Physical properties

bp 81–82 °C; d 0.80 g cm?3.

Uses

Trimethylsilylketene is a reactive acylating agent for amines and alcohols; building block for synthesis of coumarins; synthesis of α-silyl ketones via the addition of organocerium reagents; treatment with stabilized ylides forms trimethylsilyl-substituted allenes;a cycloaddition with aldehydes affords β-lactones; forms small rings with diazomethane; treatment with n-BuLi forms a ketene enolate. It participates in the reactions of Trimethylsilylacetylation of Alcohols and Amines, Synthesis of Coumarins via Cyclization–Elimination, One-pot Formation of α-Silyl Ketones, Preparation of Trimethylsilyl-Substituted Allenes, Preparation of β-Lactones, Reaction with Diazomethane to Form Silylated Cyclopropanes and Cyclobutanones, Synthesis of Heterocycles, Formation of the Ketene Enolate, and other uses.

Preparation

Most often prepared (eq 1) by pyrolysis of ethoxy(trimethylsilyl)acetylene at 120??C (100 mmol scale, 65% yield).Recently, pyrolysis of t-butoxy(trimethylsilyl) acetylene has been shown to be a convenient alternative for the preparation of trimethylsilylketene (1). Thermal decomposition of t-butoxy(trimethylsilyl)acetylene causes elimination of 2-methylpropene slowly at temperatures as low as 50??C and instantaneously at 100¨C110??C (30 mmol scale, 63% yield). The main advantage of this method is that it is possible to generate trimethylsilylketene in the presence of nucleophiles, leading to in situ trimethylsilylacetylation (eq 2). Increased shielding of the triple bond prevents problems such as polymerization and nucleophilic attack that occur when the ketene is generated in situ from (trimethylsilyl)ethoxyacetylene. Trimethylsilylketene can also be prepared (eq 3) via the dehydration of commercially available trimethylsilylacetic acid with 1,3- dicyclohexylcarbodiimide (DCC) in the presence of a catalytic amount of triethylamine (100 mmol scale, 63%). Other typical methods used for ketene generation such as dehydrohalogenation of the acyl chloride and pyrolysis of the anhydride have been applied to the preparation of (1); however, both methods afford low yields.

There have been no significant developments in the methods used to prepare trimethylsilylketene (TMSK). However, Black et al. have published slight modifications. to the original preparation by Ruden, which primarily deals with accessing ethoxyacetylene.