Method for the dehydrogenation and methylation of silanes with methyl chloride

Patent metadata

Field	Value
Publication number	US-2023141781-A1
Application number	US-202017917562-A
Country	US
Kind code	A1
Filing date	Apr 23, 2020
Priority date	Apr 23, 2020
Publication date	May 11, 2023
Grant date	—

Abstract

A process for dehydrogenating and methylating silanes. The process includes providing methyl chloride that is reacted with a silane selected from the group consisting of SiH 4 , H 2 SiMe 2 , H 2 SiMeCl, H 3 SiMe, H 3 SiCl and HSiMe 2 Cl, in the presence of at least one ammonium and/or phosphonium salt at a temperature in the range of 70-350° C.

First claim

1 - 7 . (canceled)

8 . A process for dehydrogenating and methylating silanes, comprising:
providing methyl chloride that is reacted with a silane selected from the group consisting of SiH 4 , H 2 SiMe 2 , H 2 SiMeCl, H 3 SiMe, H 3 SiCl and HSiMe 2 Cl, in the presence of at least one ammonium and/or phosphonium salt at a temperature in the range of 70-350° C.

9 . The process as claimed in claim 8 , wherein the temperature is in a range of 100-350° C.

10 . The process of claim 8 , wherein the molar ratio of silane to methyl chloride is in a range of 1:1 to 1:10.

11 . The process of claim 8 , wherein the molar ratio of catalyst to silane is in a range of 0.01:1 to 0.2:1.

12 . The process of claim 8 , wherein the ammonium and/or phosphonium salt is selected from the group consisting of quaternary ammonium halides [R 4 N]X, quaternary phosphonium halides [R 4 P]X and tertiary ammonium halides [R 3 NH]X, wherein in each case: X=Cl, Br or I, and R=independently selected from the group consisting of (i) C 1 -C 12 -alkyl group, (ii) C 6 -C 14 -aryl group substituted by C 1 -C 6 -alkyl, and (iii) phenyl group.

13 . The process of claim 12 , wherein the ammonium and/or phosphonium salt is selected from the group consisting of [n-Bu 4 N]Cl, [Et 4 N]Cl, [Ph 4 P]Cl and [n-Bu 4 P]Cl.

14 . The process of claim 8 , wherein the process is conducted continuously or batchwise.

Assignees

• Wacker Chemie Ag

Inventors

• Tillmann Jan
• Weidner Richard

Classifications

• C07F9/5442

  Aromatic phosphonium compounds (P-C aromatic linkage) · CPC title

• C07F7/125 Primary

  by reactions involving both Si-C and Si-halogen linkages, the Si-C and Si-halogen linkages can be to the same or to different Si atoms, e.g. redistribution reactions · CPC title

• C07F7/14 Primary

  Preparation thereof from {optionally substituted} halogenated silanes and hydrocarbons {hydrosilylation reactions} · CPC title

• C07F9/5407

  Acyclic saturated phosphonium compounds · CPC title