公开(公告)号：DE2518922A1

公开(公告)日：1976-11-18

申请号：DE2518922

申请日：1975-04-29

Applicant: HOECHST AG

Inventor： SAHM WILFRIED DIPL CHEM DR ,  HILLE ERNST DIPL CHEM DR ,  SCHILLER WOLFGANG

IPC: C07D235/26

Abstract: 5-Acetoacetylamino benzimidazolone-(2) is obtained in high yield and excellent purity by reacting diketene with the aqueous solution of a salt of 5-amino-benzimidazolone-(2) and an acid having a pKa value of 1 to 7, preferably in the presence of an antioxidant and/or a reducing agent.

公开(公告)号：DE2612391A1

公开(公告)日：1977-10-06

申请号：DE2612391

申请日：1976-03-24

Applicant: HOECHST AG

Inventor： HEISE HARTMUT DIPL CHEM DR ,  LEIBMANN BERND DIPL CHEM DR ,  MOERLER DIETER DIPL CHEM DR ,  RITTER EBERHARD DIPL CHEM DR ,  SAHM WILFRIED DIPL CHEM DR

IPC: C07D235/26

Abstract: When continuously reacting an aqueous solution of 5-aminobenzimidazolone-(2) or a salt thereof with diketene then 5-acetoacetylamino-benzimidazolone is obtained in a smooth and safe reaction without foaming. The product results in high space-time yield and excellent quality.

公开(公告)号：DE2405056A1

公开(公告)日：1974-08-15

申请号：DE2405056

申请日：1974-02-02

Applicant: HOECHST AG

Inventor： SAHM WILFRIED DIPL CHEM DR ,  SCHINZEL ERICH DR ,  ROESCH GUENTER

IPC: C08K5/00 ,  C07D307/79 ,  C07F9/165 ,  C07F9/653 ,  C08K5/1535 ,  C08K5/35 ,  C08L67/00 ,  C08L77/00 ,  C09B57/00 ,  C07D85/48 ,  C07D5/40

Abstract: Benzofuran compounds of the formula WHEREIN E is a bivalent bridging member of the formula S is hydrogen, halogen, lower alkyl, carboxy, sulfo, cyano, lower carboalkoxy, carbonamido, lower mono- or dialkyl carbonamido, sulfonic acid lower alkyl ester, sulfonamido, lower mono- or dialkyl sulfonamido or phenyl; P, Q, T and U are hydrogen or halogen, lower alkyl, lower alkoxy, phenyl, carboxy, cyano, lower carboalkoxy, lower carbo-alkoxy substituted by a member selected from the group consisting of lower alkoxy, lower dialkylamino and lower trialkyl ammonium, carbonamido, lower mono- or di-alkyl carbonamido, sulfo, sulfonic acid lower alkyl ester, sulfonamido or lower mono- or dialkyl sulfonamido or P and Q together or T and U together are lower alkylene or an annellated phenyl ring, and n is 1 to 3. These compounds can be synthetized by a condensation reaction of the corresponding carboxylic acid derivative with an ortho-aminophenol or by HORNER or similar syntheses forming said bridging member. The products are optical brighteners.