US5142073A
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Synthesis of molybdenum and tungsten complexes
Assignee: Massachusetts Institute of Technology
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Filing: 1991-04-30
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Granted: 1992-08-25
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Expires: 2011-04-30
Abstract
Abstract Molybdenum and tungsten complexes useful as precursors for catalysts useful in the metathesis of olefins are disclosed. New compounds have the formula: M(R 1 ) 2 (NR 2 ) 2 (R 3 ) x .
Inventors
- 👤 Richard R. Schrock
- 👤 Harold H. Fox
- 👤 Brian L. Goodall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:51
CPC Classifications
C; C07; C07F; C07F11/00; C07F11/005
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
49 words
A compound of the general formula: M(R.sub.1).sub.2 (NR.sub.2).sub.2 (R.sub.3).sub.x wherein M is molybdenum or tungsten; N is nitrogen; R 1 is halogen; R 2 is phenyl or substituted phenyl; R 3 is Lewis base having at least one lone pair of electrons and x is 0, 1 or 2.
Claim 2
Dependent Claim
49 words
A compound of the general formula: M(R.sub.1).sub.2 (NR.sub.2).sub.2 (R.sub.3).sub.x wherein M is molybdenum or tungsten; N is nitrogen; R 1 is halogen; R 2 is phenyl or substituted phenyl; R 3 is Lewis base having at least one lone pair of electrons and x is 0, 1 or 2.
Claim 3
Dependent Claim
12 words
A compound according to claim 1: wherein halogen is chlorine or bromine.
Claim 4
Dependent Claim
25 words
A compound according to claim 1: wherein said substituted phenyl is a member selected from the group consisting of 2,6-diisopropylphenyl, 2,6-dimethylphenyl, and ortho-tert butyl phenyl.
Claim 5
Dependent Claim
41 words
A compound according to claim 1: wherein said Lewis base is a member selected from the group consisting of tetrahydrofuran, 1,2-dimethoxyethane, pyridine, quinuclidine, P(R) 3 and (R) 2 PCH 2 CH 2 P(R) 2 in which R is alkyl or aryl.
Claim 6
Dependent Claim
25 words
A compound according to claim 1: wherein M is molybdenum; N is nitrogen; halogen is chlorine; substituted phenyl is 2,6-diisopropylphenyl; and Lewis base is 1,2-dimethoxyethane.
Claim 7
Dependent Claim
25 words
A compound according to claim 1: wherein M is molybdenum; N is nitrogen; halogen is chlorine; substituted phenyl is 2,6-dimethylphenyl; and Lewis base is 1,2-dimethoxyethane.
Claim 8
Dependent Claim
71 words
A method for the production of a compound as defined in claim 1 which comprises: (a) mixing a molybdate or a tungstate with aniline, substituted aniline or (CH 3 ) 3 SiNHAr in which Ar is phenyl or substituted phenyl, a deprotonating agent, a triflating or a halogenating agent, and a solvent therefor; (b) heating the resulting mixture to drive the reaction to completion; and (c) recovering the said compound I.
Claim 9
Dependent Claim
13 words
The method of claim 7 wherein said molybdate is ammonium or alkylammonium molybdate.
Claim 10
Dependent Claim
13 words
The method of claim 7 wherein said tungstate is ammonium or alkylammonium tungstate.
Claim 11
Dependent Claim
23 words
The method of claim 7 wherein said substituted aniline is a member selected from the group consisting of 2,6-diisopropylaniline, 2,6-dimethylaniline and ortho-tert-butyl aniline.
Claim 12
Dependent Claim
23 words
The method of claim 7 wherein said deprotonating agent is a member selected from the group consisting of triethylamine, pyridine and substituted pyridine.
Claim 13
Dependent Claim
13 words
The method of claim 7 wherein said halogenating agent is trimethylsilylchloride or trimethylsilylbromide.
Claim 14
Dependent Claim
19 words
The method of claim 7 wherein said triflating agent has the formula: Me 3 SiSO 3 CF 3 .
Claim 15
Dependent Claim
12 words
The method of claim 7 wherein said solvent comprises a Lewis base.
Claim 16
Dependent Claim
40 words
The method of claim 14 wherein said Lewis base is a member selected from the group consisting of tetrahydrofuran, 1,2-dimethoxyethane, pyridine, quinuclidine, P(R) 3 and (R) 2 PCH 2 CH 2 P(R) 2 in which R is alkyl or aryl.
Claim 17
Dependent Claim
12 words
The method of claim 7 wherein said solvent is a non-coordinating solvent.
Claim 18
Dependent Claim
22 words
The method of claim 16 wherein said solvent is a member selected from the group consisting of toluene, diethylether, dichloromethane and trichloromethane.
Claim 19
Dependent Claim
21 words
The method of claim 7 wherein the mixture is heated between 60 and 70 degrees Centigrade for at least six hours.
References Cited (Backward Citations)
No citation records indexed.
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