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.

公开(公告)号：DE3428170A1

公开(公告)日：1986-02-06

申请号：DE3428170

申请日：1984-07-31

Applicant: HOECHST AG

Inventor： HUMBURG GERHARD DIPL CHEM DR ,  BERGER HARALD DIPL CHEM DR ,  KAUFMANN WILHELM

IPC: C09B11/12 ,  C09B11/20 ,  C09D11/02

Abstract: In the novel process for the preparation of Leueo Crystal Violet by reduction of Crystal Violet, the reduction with sodium borohydride is carried out in an alkaline solution containing water and alcohol, 0.9 to 1.5 mol of NaOH and 0.25 to 1 mol of sodium borohydride being used, in particular, per mole of Crystal Violet. The process leads to a pure product in high yield without expensive purification steps.