公开(公告)号：DE3628354A1

公开(公告)日：1988-02-25

申请号：DE3628354

申请日：1986-08-21

Applicant: BASF AG

Inventor： HABERMANN WOLFGANG ,  MAYER UDO DR ,  HAMMES PETER DR ,  LANDMANN BERND DR

IPC: C25B3/23 ,  C25B3/02 ,  C09B11/18

Abstract: A process for the preparation of a water soluble food-grade diaminotriphenylmethane colorant containing from 2 to 4 sulfo groups, comprising anodically oxidizing the corresponding leuco compound in an electrolysis cell divided into an anode space and a cathode space in the presence of from 0.01 to 2% by weight, based on the solution being oxidized, of a C2-C4-alkanol, urea, a urea derivative or a mixture thereof, at a potential epsilon h

公开(公告)号：DE3800577A1

公开(公告)日：1989-07-20

申请号：DE3800577

申请日：1988-01-12

Applicant: BASF AG

Inventor： KRANZ JOACHIM DR ,  LANDMANN BERND DR ,  MAYER UDO DR

IPC: C07C229/34 ,  C07C229/52 ,  C07D209/46 ,  C07D295/155

Abstract: Novel isoindolenines of the general formula (I) … … in which… R stands for hydrogen, for C1-C12-alkyl which is optionally substituted by chlorine, hydroxyl, phenyl or cyano, for C5-C8 cycloalkyl or for phenyl which is optionally substituted by chlorine or methyl,… R stands for hydrogen, C1-C6-alkyl which is optionally substituted by chlorine, hydroxyl, phenyl or cyano, or … … or for a morpholino, pyrrolidino or piperidino radical and… R stands for hydrogen or methyl and the benzene ring A is optionally substituted by 1 to 4 chlorine, 1 or 2 C1-C4-alkyl or a nitro group,… are obtained by condensation of 3-aminophenols of the formula (II) … … with 3-amino-1-oxoisoindolenines of the general formula (III) … … in the presence of acids. … The isoindolenine compounds (I) can be hydrolysed to benzoylbenzoic acids (IV) … … in very good yield. … In this way, benzoylbenzoic acids are readily accessible which are only accessible with difficulty or are virtually inaccessible according to the processes of the prior art.

公开(公告)号：DE3800575A1

公开(公告)日：1989-07-20

申请号：DE3800575

申请日：1988-01-12

Applicant: BASF AG

Inventor： MAYER UDO DR ,  LANDMANN BERND DR

IPC: C09B11/28 ,  B41M5/145 ,  B41M5/327 ,  C07D493/10 ,  C09D11/02

公开(公告)号：DE58906464D1

公开(公告)日：1994-02-03

申请号：DE58906464

申请日：1989-01-03

Applicant: BASF AG

Inventor： KRANZ JOACHIM DR ,  LANDMANN BERND DR ,  MAYER UDO DR

IPC: C07C229/34 ,  C07C229/52 ,  C07D209/46 ,  C07D295/155

Abstract: Novel isoindolenines of the general formula (I) … … in which… R stands for hydrogen, for C1-C12-alkyl which is optionally substituted by chlorine, hydroxyl, phenyl or cyano, for C5-C8 cycloalkyl or for phenyl which is optionally substituted by chlorine or methyl,… R stands for hydrogen, C1-C6-alkyl which is optionally substituted by chlorine, hydroxyl, phenyl or cyano, or … … or for a morpholino, pyrrolidino or piperidino radical and… R stands for hydrogen or methyl and the benzene ring A is optionally substituted by 1 to 4 chlorine, 1 or 2 C1-C4-alkyl or a nitro group,… are obtained by condensation of 3-aminophenols of the formula (II) … … with 3-amino-1-oxoisoindolenines of the general formula (III) … … in the presence of acids. … The isoindolenine compounds (I) can be hydrolysed to benzoylbenzoic acids (IV) … … in very good yield. … In this way, benzoylbenzoic acids are readily accessible which are only accessible with difficulty or are virtually inaccessible according to the processes of the prior art.

公开(公告)号：DE3761571D1

公开(公告)日：1990-03-08

申请号：DE3761571

申请日：1987-08-18

Applicant: BASF AG

Inventor： HABERMANN WOLFGANG ,  MAYER UDO DR ,  HAMMES PETER DR ,  LANDMANN BERND DR

IPC: C25B3/23 ,  C25B3/02

Abstract: A process for the preparation of a water soluble food-grade diaminotriphenylmethane colorant containing from 2 to 4 sulfo groups, comprising anodically oxidizing the corresponding leuco compound in an electrolysis cell divided into an anode space and a cathode space in the presence of from 0.01 to 2% by weight, based on the solution being oxidized, of a C2-C4-alkanol, urea, a urea derivative or a mixture thereof, at a potential epsilon h