The prooduction of 3-Trimethylsilyl-3-buten-2-one (CAS NO. ) needs four steps. The synthetic route is as follows:

Frist of all, you should produce Vinyltrimethylsilane: a 1 L, three-necked, round-bottomed flask fitted with a mechanical stirrer, a reflux condenser, and a 500 ml, pressure-equalizing dropping funnel is charged with 26.4 g (1.09 g atom) of magnesium turnings and 800 ml of dry tetrahydrofuran. A solution of 107 g (70.5 ml, 1.00 mole) of vinyl bromide in 200 ml of tetrahydrofuran is placed in the addition funnel and slowly added dropwise to the reaction vessel. After the reaction has begun, the addition rate is regulated, maintaining a gentle reflux during the remainder of the addition period. The mixture is heated at reflux for an additional hour, and a solution of 108 g (0.995 mole) of chlorotrimethylsilane in 100 ml. of tetrahydrofuran is added dropwise while the reaction is maintained at reflux with continued heating and stirring. The suspension is stirred for another 2 hours under reflux, then cooled to room temperature and stirred overnight. The condenser and dropping funnel are removed, and the flask is equipped for distillation with a 30.5 cm. Vigreux column. The distillate (b.p. 60–65 °C) is collected, transferred to a separatory funnel, and washed with 10–20 100 ml portions of water, yielding 67–78 g (67–78%) of silane as a colorless liquid containing small amounts of tetrahydrofuran.

Secondly, please use Vinyltrimethylsilane to get (1-Bromoethynl)trimethylsilane: a 1L, three-necked, round-bottomed flask equipped with a mechanical stirrer and a 250 ml dropping funnel is charged with 89.8 g (approximately 0.90 mole) of silane. The contents of the flask are stirred and cooled to -78 °C, and 168 g (1.06 mole) of bromine is added dropwise over ca. 1 hour. The cooling bath is removed, and the red viscous mixture is warmed to room temperature. The flask is fitted with an efficient, water-cooled condenser, and 425 g (600 ml, 5.82 moles) of diethylamine is cautiously added with continued stirring. After the addition is complete, the reaction mixture is heated at reflux for 12 hours, during which time a precipitate of diethylamine hydrochloride forms. The salts are separated from the cooled suspension by filtration and washed with several 300 ml portions of diethyl ether. The ether filtrate is carefully washed, first with 100 ml portions of 10% hydrochloric acid until the aqueous layer remains acidic (pH ca. 2), then with 100 ml of water and 200 ml of saturated aqueous sodium chloride. The ether solution is dried with anhydrous magnesium sulfate, concentrated with a rotary evaporator, and distilled under reduced pressure through a 20.3 cm. Vigreux column, affording 104-110 g. (65–68%) of silane, b.p. 72–75°C (120 mm).

Then you can obtain 3-Trimethylsilyl-3-buten-2-ol from (1-Bromoethynl)trimethylsilane: a 500 ml, three-necked, round-bottomed flask equipped with two 30.5cm Liebig condensers connected in series, a pressure-equalizing dropping funnel, and a magnetic stirrer is charged with 9.2 g (0.38 g-atom) of magnesium turnings and 100 ml of tetrahydrofuran and. About 2 g of 1,2-dibromoethane is added, initiating the formation of the Grignard reagent. When the supernatant solution becomes warm and begins to reflux from reduction of 1,2-dibromoethane, a solution of 50 g (0.28 mole) of silane in 75 ml of tetrahydrofuran is added dropwise to the stirred mixture at a rate that maintains gentle reflux. After the addition is complete, the reaction mixture is kept at reflux for an additional hour before freshly distilled (25.0 g, 0.568 mole) is introduced. The temperature is maintained at reflux, and stirring is continued throughout the addition and for an additional hour. The flask is then fitted with a distillation head and heated until ca. 100 ml of distillate has been collected. The reaction mixture is cooled (ice-water bath) and stirred, diluted with 100 ml of ether, and hydrolyzed by addition of enough saturated ammonium chloride (approximately 50 ml) to dissolve the thick, sticky precipitate. The salts are filtered and washed with ether, and the aqueous layer of the filtrate is extracted with three 150 ml portions of ether. The combined ether layers are washed with saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and concentrated by distillation at atmospheric pressure, giving 48–55 g of crude butenol as a liquid that is used in the next step without further purification.

The last step is the production of 3-Trimethylsilyl-3-buten-2-one by the use of 3-Trimethylsilyl-3-buten-2-ol. A solution of 55 g of crude butenol in 100 ml of acetone is placed in a 500 ml, three-necked, round-bottomed flask equipped with a mechanical stirrer and a 250 ml dropping funnel. The reaction vessel is immersed in an ice-water bath, and 95 ml of an aqueous solution containing chromium trioxide and sulfuric acid is added to the stirred acetone solution. After completion of the addition, 2-propanol is added to the reaction mixture until a green endpoint is reached, indicating consumption of excess oxidant. The contents are poured into 450 ml of ether, 300 ml of water are added, and the aqueous layer is saturated with sodium chloride. The layers are separated, and the aqueous solution is extracted with five 150 ml portions of ether. The combined ether solutions are washed with two 150 ml portions of saturated aqueous sodium chloride, dried with anhydrous magnesium sulfate, and concentrated by distillation at atmospheric pressure through a 30.5 cm Vigreux column. Continued distillation under reduced pressure gives, after separation of a low boiling forerun, 14.7–15 g (37–38%) of butenone as a pale yellow liquid.