ES8400077A1 - Palladium cpd.-catalysed stilbene-4,4-di:aldehyde prepn. - Google Patents
Palladium cpd.-catalysed stilbene-4,4-di:aldehyde prepn.Info
- Publication number
- ES8400077A1 ES8400077A1 ES515925A ES515925A ES8400077A1 ES 8400077 A1 ES8400077 A1 ES 8400077A1 ES 515925 A ES515925 A ES 515925A ES 515925 A ES515925 A ES 515925A ES 8400077 A1 ES8400077 A1 ES 8400077A1
- Authority
- ES
- Spain
- Prior art keywords
- pref
- reaction
- bromobenzaldehyde
- catalyst
- stilbene
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Prodn. of title cpd. (I) comprises reacting ethylene with 4-bromobenzaldehyde in presence of base and a Pd cpd. as catalyst, the reaction being effected at an ethylene partial pressure of 0.01-1 (0.1-1) bar. - Pref. reaction is effected in presence of a mixt. of Pd acetate and tri-o-tolyl phosphine. Pref. catalyst is used in amt. 0.01-2 mol.% w.r.t. 4-bromobenzaldehyde. Pref. reaction is effected at 30-200 (80-150) deg.C and in the presence of an inert organic soln., compared with the reaction constituents. Pref. soln. used is cyclic or N,N disubstd. amide. - (I) can be used in the mfr. of known optical brighteners, see US4108887.(Dwg.0/0) EPAB- EP-104296 B A process for the preparation of stilbene-4,4'-dialdehyde by reacting ethylene with 4-bromobenzaldehyde in the presence of a base and of a palladium compound as catalyst, which process comprises performing the reaction under an ethylene partial pressure in the range from 0.01 to 1 bar. (5pp) USAB- US4579975 A Prepn. of stilbene-4,4'-dialdehyde comprises reaction of ethylene (0.1-1.0 bar) with 4-bromobenzaldehyde in the presence of a tert. amine, pref. tert. amines or alkylenediamines, and a Pd(II) salt or Pd(O)-tert.phosphine complex (0.004-0.05 mol% based on the bromoaldehyde) in an inert solvent (pref. cyclic or N,N-disubstd. amide) at 80-150 deg.C. Pref. catalyst is a mixt. of Pd(OAc)2 and y(po tri(2-tolyl)phosphine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES515925A ES515925A0 (en) | 1982-09-24 | 1982-09-24 | "PROCEDURE FOR THE PRODUCTION OF ESTILBEN-4,4'-DIALDEHYDE". |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES515925A ES515925A0 (en) | 1982-09-24 | 1982-09-24 | "PROCEDURE FOR THE PRODUCTION OF ESTILBEN-4,4'-DIALDEHYDE". |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| ES8400077A1 true ES8400077A1 (en) | 1983-10-16 |
| ES515925A0 ES515925A0 (en) | 1983-10-16 |
Family
ID=8484703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES515925A Granted ES515925A0 (en) | 1982-09-24 | 1982-09-24 | "PROCEDURE FOR THE PRODUCTION OF ESTILBEN-4,4'-DIALDEHYDE". |
Country Status (1)
| Country | Link |
|---|---|
| ES (1) | ES515925A0 (en) |
-
1982
- 1982-09-24 ES ES515925A patent/ES515925A0/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| ES515925A0 (en) | 1983-10-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FD1A | Patent lapsed |
Effective date: 19970612 |