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公开(公告)号：CA2124058A1
公开(公告)日：1994-11-22
申请号：CA2124058
申请日：1994-05-20
Applicant: HOECHST AG
Inventor： RITTNER SIEGBERT , RUEFFER HANS-MARTIN , SCHMID JOERG , WISSER THOMAS
Abstract: Process for the preparation of 2-hydroxynaphthalene-6-carboxylic acid A process for the preparation of 2-hydroxynaphthalene-6-carboxylic acid using potassium carbonate and CO at temperatures above 260.degree.C and at a pressure of at least 10 bar comprises using 2-hydroxynaphthalene-3-carboxylic acid and/or 2-hydroxynaphthalene-3,6-dicarboxylic acid and/or their potassium salts and, if desired, potassium .beta.-naphtholate as starting materials. The process according to the invention enables a considerable inerease, by reusing the secondary products, in the product selectivity with regard to 2-hydroxy-naphthalene-6-carboxylic acid.
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公开(公告)号：FI105808B
公开(公告)日：2000-10-13
申请号：FI924911
申请日：1992-10-29
Applicant: HOECHST AG
Inventor： RITTER EBERHARD , WISSER THOMAS , RIEDEL ALFRED , GSCHEIDMEIER MANFRED , MAGINOT JOACHIM
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公开(公告)号：CA2081862A1
公开(公告)日：1993-05-02
申请号：CA2081862
申请日：1992-10-30
Applicant: HOECHST AG
Inventor： RITTER EBERHARD , WISSER THOMAS , RIEDEL ALFRED , GSCHEIDMEIER MANFRED , MAGINOT JOACHIM
Abstract: Process for the preparation of camphene by the rearrangement of .alpha.-pinene In the preparation of camphene by the rearrangement of .alpha.- pinene, the reaction time can be shortened by carrying out the rearrangement under reflux. The heat of reaction produced is eliminated by evaporative cooling. The composition of the reaction mixture can be controlled by monitoring the temperature towards the end of the reaction.
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Patent Agency Ranking
公开(公告)号：FI924911A0
公开(公告)日：1992-10-29
申请号：FI924911
申请日：1992-10-29
Applicant: HOECHST AG
Inventor： RITTER EBERHARD , WISSER THOMAS , RIEDEL ALFRED , GSCHEIDMEIER MANFRED , MAGINOT JOACHIM
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公开(公告)号：BR9606033A
公开(公告)日：1998-09-01
申请号：BR9606033
申请日：1996-12-17
Applicant: HOECHST AG
Inventor： STREB JOHANN , RINK THOMAS , ZENK ROLAND , RIEDEL MICHAEL , CABRERA IVAN , KAUFMANN WILHELM , WISSER THOMAS
IPC: C07F17/00
Abstract: A method for the depletion of inorganic byproducts from product mixtures produced during the synthesis of metallocenes comprises treating the mixture, which contains one or more metallocenes and at least one inorganic byproduct, with a polar extraction agent. Also claimed is the use of polar extraction agents for removing inorganic byproducts from metallocene synthesis product mixtures. Preferably the mixture is a crude metallocene synthesis reaction product. The extraction agent contains 5 - 100 vol.% one or more polar solvents. The amount of inorganic byproducts is reduced to less than 5 wt.%. The byproducts are inorganic salts and / or covalent metal halides.
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公开(公告)号：CA2124063A1
公开(公告)日：1994-11-22
申请号：CA2124063
申请日：1994-05-20
Applicant: HOECHST AG
Inventor： RITTNER SIEGBERT , RUEFFER HANS-MARTIN , SCHMID JOERG , WISSER THOMAS
IPC: C07B61/00 , C07C51/10 , C07C51/14 , C07C65/03 , C07C65/11 , C07C65/21 , C07C65/24 , C07C227/02 , C07C229/64 , C07C229/70 , C07C65/01 , C07C51/15
Abstract: Process for the preparation of aromatic hydroxy carboxylic acids A process for the preparation of aromatic hydroxy carboxylic acids by reacting alkali metal phenolates or alkali metal naphtholates with alkali metal carbonates and carbon monoxide, with susequent acidification, wherein the solid starting materials - alkali metal carbonate and/or alkali metal phenolate or naphtholate are metered into the reaction mixture in the form of one or more dispersions in an inert organic liquid . The process according to the invention enables the preparation of aromatic hydroxy carboxylic acids in good yields and with high chemical selectivity. Additional measures for increasing the selectivity, as described for example for the Kolbe-Schmitt reaction in EP-A 0 053 824, EP-A 0 081 753 and EP-A 0 254 596, and for the reaction with CO and carbonate in, for example, WO 91/11422, are unnecessary.
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公开(公告)号：CA2124055A1
公开(公告)日：1994-11-22
申请号：CA2124055
申请日：1994-05-20
Applicant: HOECHST AG
Inventor： RITTNER SIEGBERT , RUEFFER HANS-MARTIN , SCHMID JOERG , WISSER THOMAS
IPC: B01J27/232 , C07B61/00 , C07C51/15 , C07C65/03 , C07C65/11 , C07C65/21 , C07C65/24 , C07C227/02 , C07C229/64 , C07C229/70 , C07C65/01
Abstract: Process for preparing aromatic hydroxycarboxylic acids A process for preparing aromatic hydroxycarboxylic acids or di-salts thereof by reaction of alkali metal phenolates or naphtholates with carbon dioxide, in the presence or absence of a further alkali metal salt, which comprises introducing the solid phenolate or naphtholate starting materials and, if desired, the alkali metal salt into the reaction mixture batchwise or continuously, separately or together, in the form of a dispersion in an inert organic liquid. The process of the invention makes possible the preparation of aromatic hydroxycarboxylic acids in good yields and with high chemical selectivity. Additional measures for increasing the selectivity, as are described for the Kolbe-Schmitt reaction in, for example, EP-A 0 053 824, EP-A 0 081 753 and EP-A 0 254 596, can be omitted.
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公开(公告)号：FI924911A
公开(公告)日：1993-05-02
申请号：FI924911
申请日：1992-10-29
Applicant: HOECHST AG
Inventor： RITTER EBERHARD , WISSER THOMAS , RIEDEL ALFRED , GSCHEIDMEIER MANFRED , MAGINOT JOACHIM
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