Company Filing History:
Years Active: 1980-1981
Title: Innovations of Wolfgang Dannenberg
Introduction
Wolfgang Dannenberg is a notable inventor based in Wunstorf, Germany. He has made significant contributions to the field of chemistry, particularly in the development of innovative chemical processes. With a total of three patents to his name, Dannenberg's work has had a meaningful impact on various applications.
Latest Patents
Dannenberg's latest patents include a process for the synthesis of 2,2-Bis[4-(2,3-dibromopropoxy)-3,5-dibromophenyl]-propane (BDDP). This bisphenol-A derivative is prepared by reacting 2,2-bis[4-hydroxy-3,5-dibromophenyl]-propane with an allyl halide, followed by bromination of the resulting diallyl ether. The process utilizes a lower aliphatic alcohol as a solvent in the first step and an aromatic halogenated hydrocarbon in the second step. The final product is precipitated using excess alcohol and separated, resulting in BDDP granules that serve as effective flameproofing agents.
Another significant patent involves a process for resolving racemic DL-.alpha.-aminocarboxylic acids. In this method, the acids are reacted in an inert solvent with an aromatic o-hydroxy aldehyde to form an azomethine derivative. This derivative is then reacted with an optically active amine base to produce a diastereomeric salt. The respective optically active .alpha.-aminocarboxylic acid is obtained through acid treatment, allowing for the resolution of both aliphatic and aromatic .alpha.-amino-carboxylic acids, particularly p-hydroxyphenyl glycine.
Career Highlights
Dannenberg is currently associated with Riedel-de Haen Aktiengesellschaft, where he continues to innovate and contribute to the field of chemistry. His work has been recognized for its practical applications and contributions to chemical safety and efficacy.
Collaborations
Dannenberg has collaborated with notable coworkers such as Horst Schmand and Walter Heyer. Their combined expertise has further advanced the research and development of chemical processes.
Conclusion
Wolfgang Dannenberg's innovative work in chemical processes has led to significant advancements in the field. His patents reflect a commitment to enhancing safety and functionality