methoxy-tri(propan-2-yl)silane

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an inert gas, 24.2 g magnesium chips (1.0 mol) were combined with about 20 ml methyl-tert-butylether, an iodine crystal and 3.1 g 2-chloropropane (0.04 mol). To start the reaction a solution of 61.9 g tetramethoxysilane (0.41 mol) and 75.4 g 2-chloropropane (0.96 mol) in 140 ml methyl-tert-butylether was added dropwise, with stirring, to the first mixture at a rate to maintain a moderate reflux. After addition of the solution, the reaction was allowed to reflux for six more hours. After cooling the reaction mixture, 6.0 g methanol (0.19 mol) was added, the mixture was stirred for a few minutes and then the resulting precipitate was removed by filtration. After washing the filter cake with several portions of methyl-tert-butylether, the solvent was distilled from the combined filtrates. The remaining residue consisted of 70.5 g diisopropyldimethoxysilane (98% of the theoretical yield) which had a purity of 98% according to GC. Triisopropylmethoxysilane was not detected by GC. was added dropwise to maintain a moderate reflux After addition of the solution to reflux for six more hours was added the mixture was stirred for a few minutes the resulting precipitate was removed by filtration After washing the filter cake with several portions of methyl-tert-butylether the solvent was distilled from the combined filtrates theoretical yield) which

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under an inert gas, 24.2 g magnesium chips (1.0 mol) were combined with about 20 ml methyl-tert-butylether, an iodine crystal and 3.1 g 2-chloropropane (0.04 mol). To start the reaction a solution of 61.9 g tetramethoxysilane (0.41 mol) and 75.4 g 2-chloropropane (0.96 mol) in 140 ml methyl-tert-butylether was added dropwise, with stirring, to the first mixture at a rate to maintain a moderate reflux. After addition of the solution, the reaction was allowed to reflux for six more hours. After cooling the reaction mixture, 6.0 g methanol (0.19 mol) was added, the mixture was stirred for a few minutes and then the resulting precipitate was removed by filtration. After washing the filter cake with several portions of methyl-tert-butylether, the solvent was distilled from the combined filtrates. The remaining residue consisted of 70.5 g diisopropyldimethoxysilane (98% of the theoretical yield) which had a purity of 98% according to GC. Triisopropylmethoxysilane was not detected by GC. was added dropwise to maintain a moderate reflux After addition of the solution to reflux for six more hours was added the mixture was stirred for a few minutes the resulting precipitate was removed by filtration After washing the filter cake with several portions of methyl-tert-butylether the solvent was distilled from the combined filtrates theoretical yield) which

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The procedure of Example 13 was repeated except that triisopropylmethoxysilane was replaced by 83.3 g (0.2 moles) of triisopropyl-n-butoxysilane. The latter was reacted with 35% hydrochloric acid. There was obtained 38 g of triisopropylchlorosilane (yield; 99%).

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 500 ml-capacity, four-necked flask fitted with a stirrer, a thermometer and a Dimroth was charged with 37.7 g (0.2 moles) of triisopropylmethoxysilane. To the flask was then added 150 g of 35% hydrochloric acid, and the resulting mixture was stirred at 20° C. for 10 hours to effect the reaction. The resulting reaction solution was separated into the aqueous layer and the organic layer. The organic layer was distilled to afford 38 g of triisopropylchlorosilane as a fraction boiling at 78° C.-80° C./10 mm Hg (yield; 99%). A 500 ml-capacity, four-necked flask fitted with a stirrer the reaction The resulting reaction solution was separated into the aqueous layer The organic layer was distilled

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The procedure of Example 13 was repeated except that triisopropylmethoxysilane was replaced by 83.3 g (0.2 moles) of triisopropyl-n-butoxysilane. The latter was reacted with 35% hydrochloric acid. There was obtained 38 g of triisopropylchlorosilane (yield; 99%).

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To the mixture of the silanes containing diisopropylmethoxychlorosilane as obtained from the disproportionation reaction in (b) above, was added 150 ml of toluene to dissolve the mixture, thereby to obtain a toluene solution of the said silane mixture. The THF solution of isopropyl magnesium chloride (Grignard reagent) as prepared in (a) above was added dropwise through a dropping funnel to the toluene solution of said silane mixture at 40° C.-50° C. over 1 hour. Then the resulting mixture was stirred at 70° C. for 4 hours. Thus, the Grignard reagent was reacted with the diisopropylmethoxychlorosilane contained in the said toluene solution, to produce triisopropylmethoxysilane. To the resulting reaction solution was added dropwise 40 ml of a saturated aqueous ammonium chloride solution to dissolve the magnesium salt in the latter. The organic layer was separated from the aqueous layer and the organic layer, was distilled to afford 28 g of triisopropylmethoxysilane as a fraction boiling at 85° C.-86° C./20 mm Hg. The yield was 73%.

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To the mixture of the silanes containing diisopropylmethoxychlorosilane as obtained from the disproportionation reaction in (b) above, was added 150 ml of toluene to dissolve the mixture, thereby to obtain a toluene solution of the said silane mixture. The THF solution of isopropyl magnesium chloride (Grignard reagent) as prepared in (a) above was added dropwise through a dropping funnel to the toluene solution of said silane mixture at 40° C.-50° C. over 1 hour. Then the resulting mixture was stirred at 70° C. for 4 hours. Thus, the Grignard reagent was reacted with the diisopropylmethoxychlorosilane contained in the said toluene solution, to produce triisopropylmethoxysilane. To the resulting reaction solution was added dropwise 40 ml of a saturated aqueous ammonium chloride solution to dissolve the magnesium salt in the latter. The organic layer was separated from the aqueous layer and the organic layer, was distilled to afford 28 g of triisopropylmethoxysilane as a fraction boiling at 85° C.-86° C./20 mm Hg. The yield was 73%.

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The procedure of Example 13 was repeated except that triisopropylmethoxysilane was replaced by 83.3 g (0.2 moles) of triisopropyl-n-butoxysilane. The latter was reacted with 35% hydrochloric acid. There was obtained 38 g of triisopropylchlorosilane (yield; 99%).

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 500 ml-capacity, four-necked flask fitted with a stirrer, a thermometer and a Dimroth was charged with 37.7 g (0.2 moles) of triisopropylmethoxysilane. To the flask was then added 150 g of 35% hydrochloric acid, and the resulting mixture was stirred at 20° C. for 10 hours to effect the reaction. The resulting reaction solution was separated into the aqueous layer and the organic layer. The organic layer was distilled to afford 38 g of triisopropylchlorosilane as a fraction boiling at 78° C.-80° C./10 mm Hg (yield; 99%). A 500 ml-capacity, four-necked flask fitted with a stirrer the reaction The resulting reaction solution was separated into the aqueous layer The organic layer was distilled

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To the mixture of the silanes containing diisopropylmethoxychlorosilane as obtained from the disproportionation reaction in (b) above, was added 150 ml of toluene to dissolve the mixture, thereby to obtain a toluene solution of the said silane mixture. The THF solution of isopropyl magnesium chloride (Grignard reagent) as prepared in (a) above was added dropwise through a dropping funnel to the toluene solution of said silane mixture at 40° C.-50° C. over 1 hour. Then the resulting mixture was stirred at 70° C. for 4 hours. Thus, the Grignard reagent was reacted with the diisopropylmethoxychlorosilane contained in the said toluene solution, to produce triisopropylmethoxysilane. To the resulting reaction solution was added dropwise 40 ml of a saturated aqueous ammonium chloride solution to dissolve the magnesium salt in the latter. The organic layer was separated from the aqueous layer and the organic layer, was distilled to afford 28 g of triisopropylmethoxysilane as a fraction boiling at 85° C.-86° C./20 mm Hg. The yield was 73%.