Synthesis of disilanylamines through transamination

Abstract

The present invention provides processes for preparing silanylamines, such as disilanylamines and polysilanylamines, and compositions comprising the silanylamines. In one embodiment, the present invention provides processes for preparing a silanylamine compound, the processes comprising reacting a starting compound of general formula RR.sup.1N(Si.sub.xH.sub.2x+1) with an amine compound of general formula R.sup.2R.sup.3NH to produce the silanylamine compound of general formula R.sup.2.sub.mR.sup.3.sub.nN(Si.sub.xH.sub.2+1).sub.3-m-n.

Claims

1. A process for preparing a silanylamine compound, the process comprising reacting a starting compound of general formula
RR.sup.1N(Si.sub.xH.sub.2x+1)(I) with an amine compound of general formula
R.sup.2R.sup.3NH(II) to produce the silanylamine compound of general formula
R.sup.2.sub.mR.sup.3.sub.nN(Si.sub.xH.sub.2x+1).sub.3-m-n(III) wherein R and R.sup.1 are independently a hydrogen, substituted or unsubstituted aryl group having 6 to 10 carbon atoms, substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, or substituted or unsubstituted cycloalkyl group having 5 to 10 carbon atoms; R.sup.2 is H; R.sup.3 is a silane of formula Si.sub.xH.sub.2x+1; x is an integer from 2 to 10; and m and n are 0.

2. The process according to claim 1, wherein the starting compound of formula (I) comprises a dialkyldisilanylamine.

3. The process according to claim 1, wherein R and R.sup.1 of the starting compound of formula (I) comprise a substituted or unsubstituted alkyl group having 1 to 4 carbon atoms and x is an integer from 2 to 4.

4. The process according to claim 1 or 2, wherein R and R.sup.1 of the starting compound of formula (I) comprise a substituted or unsubstituted alkyl group having 1 to 3 carbon atoms and x is an integer from 2 to 3.

5. The process according to claim 1, wherein the starting compound of formula (I) comprises diisopropyldisilanylamine.

6. The process according to claim 1, wherein x is an integer from 2 to 3 in the amine compound of formula (II).

7. The process according to claim 1, wherein the amine of formula (II) is bis-disilanylamine.

8. The process according to claim 1, wherein the silanylamine compound of formula (III) comprises tris(disilanyl)amine.

9. The process according to claim 1, wherein the molar ratio of formula (II) to formula (I) is from 0.1:1 to 100:1.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) This invention is about a novel synthetic method developed from transamination and use of this method to make a list of silanylamines. In one embodiment, the present invention provides processes for preparing a silanylamine compound, the processes comprising reacting a starting compound of general formula
RR.sup.1N(Si.sub.xH.sub.2x+1)(I)

(2) with an amine compound of general formula
R.sup.2R.sup.3NH(II)

(3) to produce the silanylamine compound of general formula
R.sup.2.sub.mR.sup.3.sub.nN(Si.sub.xH.sub.2x+1).sub.3-m-n(III)

(4) wherein R and R.sup.1 are independently a hydrogen, substituted or unsubstituted aryl group having 6 to 10 carbon atoms, substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, or substituted or unsubstituted cycloalkyl group having 5 to 10 carbon atoms; R.sup.2 and R.sup.3 are independently a hydrogen, substituted or unsubstituted aryl group having 6 to 10 carbon atoms, substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, substituted or unsubstituted cycloalkyl group having 5 to 10 carbon atoms, or a silane of formula Si.sub.xH.sub.2x+1; x is an integer from 2 to 10; and m or n are independently 0, 1 or 2 and m+n is 2 or less.

(5) In this invention, transamination is demonstrated to be a universal method to make five structures of disilanylamines in Table 1 except Structure IV. The transamination of diisopropyldisilanylamine (DPDS) with a secondary amine forms a Structured disilanylamine through Equation 1, with a primary amine forms a Structure-II or Structure-III disilanylamines through Equation 2, or with ammonia forms Structure-V or VI disilanylamines through Equation 3. Table 2 shows the % GC conversions of the transamination with a variety of transaminating agents achieved after 30 minutes at room temperature. The low % GC conversions in some cases have been improved through method optimization (the data are not reported herein, but available). The transaminated products have been characterized with GC-MS and .sup.1H NMR. Most of the products are compositionally new species. Several of the new species have been isolated and purified to electronic grade using standard purification methods such as distillation.

(6) Structures of Disilanylamines

(7) Disilanylamines are a family of molecules having the generic structure NR.sub.mR.sub.n(SiH.sub.2SiH.sub.3).sub.3-m-n where R and R can be hydrogen or any hydrocarbyl groups; m, n can be 0, 1 or 2. The family includes mono(disilanyl)amines, bis(disilanyl)amines and tris(disilanyl)amine which are represented with the 6 structures in Table 1.

(8) TABLE-US-00001 TABLE 1 The structures of disilanylamines Categories of Structures Disilanylamines Organic Inorganic Mono(disilanyl) amines Bis(disilanyl) amines Tris(disilanyl) amine N/A

(9) ##STR00007##

(10) TABLE-US-00002 TABLE 2 Synthesis of Structures-I, II, III, V and VI disilanylamines through transamination of diisopropylaminodisilane (DPDS) Transaminating Agents % GC Conversions to Products after 30 min @ RT (molar ratio to DPDS) Monodisilanyl Bis(disilanyl) Tris(disilanyl) Total Diethylamine (2:1) 38.8 n/a n/a 38.8 Methylamine (2:1) 69.4 22.0 n/a 100.0 Ethylamine (2:1) 73.7 23.8 n/a 100.0 Propylamine (2:1) 62.5 21.0 n/a 100.0 Butylamine (2:1) 71.3 25.0 n/a 100.0 2-Aminobutane (2:1) 96.9 1.0 n/a 99.5 Pentylamine (2:1) 51.2 13.2 n/a 100.0 2-Aminopentane (2:1) 95.2 0.8 n/a 99.2 3-Aminopentane (2:1) 97.7 0 n/a 99.7 1,2-Dimethylpropylamine (2:1) 98.0 0 n/a 100.0 t-Pentylamine (2:1) 83.2 0 n/a 84.3 Cyclopentylamine (2:1) 84.3 12.3 n/a 99.4 Cyclohexylamine (2:1) 92.2 5.1 n/a 99.8 Aniline (1:1) 74.1 0 n/a 75.7 o-toluidine (1:1) 38.6 0 n/a 40.7 2,6-Dimethylaniline (1:1) 35.0 0 n/a 35.0 Ammonia (1:3 or 3:1) 0 Near 100% 0 ~100% Bis-disilanylamine (1:1) 0 0 Near 100% ~100%

(11) Even though the transamination method is demonstrated with DPDS, this method should be extendable to other amino functional hydrido higher silane starting materials to make existing or new materials. For example, a material with the formula Si.sub.xH.sub.y(NRR).sub.z where R and R are H or hydrocarbyl groups, x is at least 2, and y and z vary can be transaminated with ammonia, a primary amine or a secondary amine to form a range of existing or new materials.

EXAMPLES

Example 1. Synthesis of Disilanyldiethylamine

(12) To a Schlenk tube was loaded 0.65 g (8.92 mmol) of diethylamine. Then 0.72 g (4.46 mmol) of disilanyl(di-isopropyl)amine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanyldiethylamine was formed in 38.8% conversion. The GC-MS confirmed the composition of disilanyldiethylamine.

Example 2. Synthesis of Disilanylmethylamine and Bis(Disilanyl)Methylamine

(13) To a Schlenk tube was loaded 3.10 ml 2.0 M solution (6.20 mmol) of methylamine in THF. Then 0.50 g (3.10 mmol) of disilanyl(di-isopropyl)amine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanylmethylamine and bis(disilanyl)methylamine were formed in 69.4% and 22.0% conversions respectively. The GC-MS confirmed the compositions of the dislanylmethylamine and bis(disilanyl)methylamine.

Example 3. Synthesis of Disilanylethylamine and Bis(Disilanyl)Ethylamine

(14) To a Schlenk tube was loaded 2.60 ml 2.0 M solution (5.20 mmol) of ethylamine in THF. Then 0.42 g (2.60 mmol) of disilanyl(di-isopropyl)amine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanylethylamine and bis(disilanyl)ethylamine were formed in 73.7% and 23.8% conversions respectively. The GC-MS confirmed the compositions of the dislanylmethylamine and bis(disilanyl)methylamine.

Example 4. Synthesis of Disilanylpropylamine and Bis(Disilanyl)Propylamine

(15) To a Schlenk tube was loaded 0.62 g (10.4 mmol) of propylamine. Then 0.84 g (5.20 mmol) of disilanyl(di-isopropyl)amine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanylpropylamine and bis(disilanyl)propylamine were formed in 62.5% and 21.0% conversions respectively. The GC-MS confirmed the compositions of disilanylpropylamine and bis(disilanyl)propylamine.

Example 5. Synthesis of Disilanylbutylamine and Bis(Disilanyl)Butylamine

(16) To a Schlenk tube was loaded 0.77 g (10.5 mmol) of butylamine. Then 0.85 g (5.27 mmol) of disilanyl(di-isopropyl)amine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanylbutylamine and bis(disilanyl)butylamine were formed in 71.3% and 25.0% conversions respectively. The GC-MS confirmed the compositions of disilanylbutylamine and bis(disilanyl)butylamine.

Example 6. Synthesis of Disilanyl(Sec-Butyl)Amine and Bis(Disilanyl)(Sec-Butyl)Amine

(17) To a Schlenk tube was loaded 0.80 g (10.9 mmol) of 2-aminobutane. Then 0.88 g (5.45 mmol) of disilanyl(di-isopropyl)amine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanyl(sec-butyl)amine and bis(disilanyl)(sec-butyl)amine were formed in 96.9% and 1.0% conversions respectively. The GC-MS confirmed the compositions of disilanyl(sec-butyl)amine and bis(disilanyl)(sec-butyl)amine.

Example 7. Synthesis of Disilanylpentylamine and Bis(Disilanyl)Pentylamine

(18) To a Schlenk tube was loaded 0.86 g (9.91 mmol) of pentylamine. Then 0.80 g (4.96 mmol) of disilanyl(di-isopropyl)amine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanylpentylamine and bis(disilanyl)pentylamine were formed in 51.2% and 13.2% conversions respectively. The GC-MS confirmed the compositions of disilanylpentylamine and bis(disilanyl)pentylamine.

Example 8. Synthesis of Disilanyl(1-Methylbutyl)Amine and Bis(Disilanyl)(1-Methylbutyl)Amine

(19) To a Schlenk tube was loaded 0.96 g (11.0 mmol) of 2-aminopentane. Then 0.89 g (5.51 mmol) of disilanyl(di-isopropyl)amine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanyl(1-methylbutyl)amine and bis(disilanyl)(1-methylbutyl)amine were formed in 95.2% and 0.8% conversions respectively. The GC-MS confirmed the compositions of disilanyl(1-methylbutyl)amine and bis(disilanyl)(1-methylbutyl)amine.

Example 9. Synthesis of Disilanyl(1-Ethylpropyl)Amine

(20) To a Schlenk tube was loaded 0.78 g (4.83 mmol) of disilanyl(di-isopropyl)amine. Then 0.84 g (9.67 mmol) of 3-aminopentane was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis.

(21) Based on the GC-FID integrations, disilanyl(1-ethylpropyl)amine was formed in 97.7% conversion. The GC-MS confirmed the composition of disilanyl(1-ethylpropyl)amine.

Example 10. Synthesis of Disilanyl(1,2-Dimethylpropyl)Amine

(22) To a Schlenk tube was loaded 0.93 g (10.7 mmol) of 1,2-diemthylpropylamine. Then 0.86 g (5.33 mmol) of disilanyl(di-isopropyl)amine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanyl(1,2-dimethylpropyl)amine was formed in 98.0% conversion. The GC-MS confirmed the composition of disilanyl(1,2-dimethylpropyl)amine.

Example 11. Synthesis of Disilanyl(Tert-Pentyl)Amine

(23) To a Schlenk tube was loaded 0.76 g (4.71 mmol) of disilanyl(di-isopropyl)amine. Then 0.82 g (9.42 mmol) of tert-pentylamine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanyl(tert-pentyl)amine was formed in 83.2% conversion. The GC-MS confirmed the composition of disilanyl(tert-pentyl)amine.

Example 12. Synthesis of Disilanyl(Cyclo-Pentyl)Amine and Bis(Disilanyl)(Cyclo-Pentyl)Amine

(24) To a Schlenk tube was loaded 0.89 g (5.51 mmol) of disilanyl(di-isopropyl)amine. Then 0.94 g (11.0 mmol) of cyclo-pentylamine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanyl(cyclo-pentyl)amine and bis(disilanyl)(cyclo-pentyl)amine were formed in 84.3% and 12.3% conversions respectively. The GC-MS confirmed the compositions of disilanyl(cyclo-pentyl)amine and bis(disilanyl)(cyclo-pentyl)amine.

Example 13. Synthesis of Disilanyl(Cyclo-Hexyl)Amine and Bis(Disilanyl)(Cyclo-Hexyl)Amine

(25) To a Schlenk tube was loaded 0.77 g (4.77 mmol) of disilanyl(di-isopropyl)amine. Then 0.95 g (9.54 mmol) of cyclo-hexylamine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanyl(cyclo-hexyl)amine and bis(disilanyl)(cyclo-hexyl)amine were formed in 92.2% and 5.1% conversions respectively. The GC-MS confirmed the compositions of disilanyl(cyclo-hexyl)amine and bis(disilanyl)(cyclo-hexyl)amine.

Example 14. Synthesis of Disilanylphenylamine

(26) To a Schlenk tube was loaded 0.85 g (5.27 mmol) of disilanyl(di-isopropyl)amine. Then 0.49 g (5.27 mmol) of aniline was added dropwise in 30 seconds at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanylphenylamine was formed in 74.1% conversion. The GC-MS confirmed the composition of disilanylphenylamine.

Example 15. Synthesis of Disilanyl(2-Methylphenyl)Amine

(27) To a Schlenk tube was loaded 0.82 g (5.08 mmol) of disilanyl(di-isopropyl)amine. Then 0.54 g (5.08 mmol) of o-toluidine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanyl(2-methylphenyl)amine was formed in 38.6% conversion. The GC-MS confirmed the composition of disilanyl(2-methylphenyl)amine.

Example 16. Synthesis of Disilanyl(2,6-Di Methylphenyl)Amine

(28) To a Schlenk tube was loaded 0.69 g (5.70 mmol) of 2,6-dimethylaniline. Then 0.92 g (5.70 mmol) of disilanyl(di-isopropyl)amine was added dropwise in 1 minute at room temperature. After agitated for 30 minutes, the product was sampled for GC-FID and GC-MS analysis. Based on the GC-FID integrations, disilanyl(2,6-dimethylphenyl)amine was formed in 35.0% conversion. The GC-MS confirmed the composition of disilanyl(2,6-dimethylphenyl)amine.

Example 17. Synthesis of Bis(Disilanyl)Amine

(29) To a 250 ml Parr reactor was loaded 66.6 g (0.413 mol) of disilanyl(di-isopropyl)amine. Then 5.28 g (0.310 mol) of ammonia was bubbled in 10 minute at room temperature. After agitated for 1 hour, the pressure in the Parr reactor was vented and the Parr reactor was opened. The product was sampled for GC-TCD and GC-MS analysis. Based on the GC-TCD integrations, bis(disilanyl)amine was formed in 90% conversion. The GC-MS confirmed the composition of bis(disilanyl)amine.

Example 18. Synthesis of Tris(Disilanyl)Amine Through Transamination

(30) To a 100 ml round bottom flask was loaded 5.99 g of the product prepared in Example 17. The product contained 2.29 g (16.6 mmol) of bis(disilanyl)amine. Then 2.31 g (14.3 mmol) (disilanyl)(di-isopropyl)amine was quickly added at room temperature. The reaction mixture was heated at 130 C. for 17 hours while volatile species were continuously distilled. The product was sampled for GC-TCD and GC-MS analysis. Based on the GC-TCD integrations, tris-disilanylamine was formed in 71% conversion. The GC-MS confirmed the composition of tris-disilanylamine.

Example 19. Synthesis of Tris(Disilanyl)Amine Through Thermal Redistribution

(31) To a 100 ml round bottom flask was loaded 13.0 g (94.5 mmol) of bis(disilanyl)amine. The flask was heated at 110 C. for 18 hours. The product was sampled for GC-TCD and GC-MS analysis. Based on the GC-TCD integrations, tris(disilanyl)amine was formed in 60% conversion. The GC-MS confirmed the composition of tris(disilanyl)amine.

Example 20. Synthesis of Tris(Disilanyl)Amine Through Thermal Redistribution

(32) To a flask was loaded bis(disilanyl)amine. The flask was heated at 110 C. for 27 hours to convert bis(disilanyl)amine to tris(disilanyl)amine and ammonia. The product was sampled for GC-TCD and GC-MS analysis. Based on the GC-TCD integrations, tris(disilanyl)amine was formed. The GC-MS confirmed the composition of tris(disilanyl)amine. The crude product was distilled in a ten-stage column to recover 98% pure tris(disilanyl)amine.

Example 21. Synthesis of Bis-Disilanylamine

(33) To a 1.5 Liter high pressure Parr reactor was loaded 375 g of disilanyl(di-isopropyl)amine. While agitating 28 g of anhydrous ammonia was added through the dip tube port over 60 minutes semi-continuously by pressuring up to 40 psig and down to 20 psig. The reactor temperature started at 20 C. and increase to 27 C. during the addition of ammonia. The reactor was cooled to 0 over 1 hr with agitation and periodic nitrogen purging. The pressure in the Parr reactor was vented and the Parr reactor was opened. The product was sampled for GC-TCD and GC-MS analysis. Based on the GC-TCD integrations, the crude product comprises 38% bis(disilanyl)amine and 8% diisopropylaminodisilane. The GC-MS confirmed the composition of bis(disilanyl)amine. The crude product was then distilled using a 5-stage column at 150 mmHg and 60 C. to recover the bis(disilanyl)amine.