Cationic silicon (II) compounds and method for the production thereof

Patent metadata

Field	Value
Publication number	US-10457696-B2
Application number	US-201616098274-A
Country	US
Kind code	B2
Filing date	May 11, 2016
Priority date	May 11, 2016
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

The invention relates to a method for producing cationic silicon (II) compounds of general formula I

(R a Si) + HA −   (I)
by reacting the silicon (II) compounds of general formula II

(R b− H)(R a Si) +   (II)
with a hydride acceptor compound A, wherein R a , (R b− H) and A have the definitions described in claim 1;

to the cationic silicon (II) compounds of general formula I and use thereof as catalysts.

First claim

The invention claimed is:

1. A method for producing cationic silicon (II) compounds of general formula I, comprising:
(R a Si) + HA −   (I)

reacting the silicon (II) compounds of general formula II
(R b− H)(R a Si) +   (II)

with a compound A,
where
R a is a carbon-containing radical, which may additionally comprise heteroatoms, bound to the cationic silicon atom via a covalent bond, ionic bond or via one or more π bonds with the cationic silicon atom,
(R b− H) is a p-bonded singly negatively charged radical of general formula III,

R x are monovalent or polyvalent organic radicals, which may also be bonded to one another to form a fused ring, with the proviso that at least one of the radicals R x is an organic radical bonded via carbon bearing at least one hydrogen atom, and
A is a compound which, as an electrophile, is capable of accepting electron pairs, wherein said compound has formula MX 3 where M is=B, Al or Ga, and where X is a C6-C20 aryl radical substituted by halogen.

2. The method of claim 1 , wherein the radicals R x are each independently hydrogen, linear or branched, acyclic or cyclic, saturated or mono- or polyunsaturated C1-C20 alkyl or C6-C20 aryl radicals.

3. The method of claim 1 , wherein R a is a p-bonded cyclopentadienyl radical substituted by the radicals R y (R y 5 Cp) wherein
R y are monovalent or polyvalent organic radicals, which may be bonded to one another to also form fused rings.

4. The method of claim 1 , wherein said reacting the silicon (II) compounds of general formula II with the compound A is carried out in aprotic solvents selected from the group consisting of hydrocarbons, chlorohydrocarbons, ethers, nitriles, organosilanes and organosiloxanes.

5. A cationic silicon (II) compound of general formula I
(R a Si) + HA −   (I)

where
R a is a carbon-containing radical, which may additionally comprise heteroatoms, bound to the cationic silicon atom via a covalent bond, ionic bond or via one or more p bonds with the cationic silicon atom and
A is a compound which, as an electrophile, is capable of accepting electron pairs, having formula MX 3 where M is=B, Al or Ga, and where X is a C6-C20 aryl radical substituted by halogen.

6. The cationic silicon (II) compounds of general formula 1as claimed in claim 5 , wherein said cationic silicon (II) compounds are catalysts.

Assignees

• Wacker Chemie Ag

Inventors

• Fritz-Langhals Elke

Classifications

• C07F17/00 Primary

  Metallocenes · CPC title

• B01J31/12

  containing organo-metallic compounds or metal hydrides · CPC title

• C07F7/0803 Primary

  Compounds with Si-C or Si-Si linkages · CPC title

• B01J31/2295

  Cyclic compounds, e.g. cyclopentadienyls · CPC title