Location History:
- Marburg, DE (1987)
- Griesheim, DE (1987)
Company Filing History:
Years Active: 1987
Title: Achim Riemann: Innovator in Phosphorus Compounds
Introduction
Achim Riemann is a notable inventor based in Marburg, Germany. He has made significant contributions to the field of chemistry, particularly in the development of aromatic phosphorus compounds. With a total of 3 patents to his name, Riemann's work has had a considerable impact on various applications in the industry.
Latest Patents
Riemann's latest patents include a method for making aromatic phosphorus compounds. This method involves compounds of the formula ##STR1## wherein R is lower alkyl or aryl, Y is oxygen or sulfur, m is 0 or 1, Ar is arylene, and X is halogen, methyl, or aryloxy. The process prepares polymers containing repeating units from a compound R--P(Y).sub.r Cl.sub.2, where r is 0 or 1 but is never greater than m, by reaction with one or two molar parts of a compound H--ArX in the presence of a Friedel-Crafts catalyst. Another significant patent is a method for making 9,9-bis-(4-hydroxyphenyl)-fluorene. This method involves reacting fluorenone with phenol at a temperature ranging from 20°C to 100°C in the presence of sulfuric acid of a concentration higher than 70 percent and a mercaptan, particularly beta-mercaptopropionic acid, as acidic condensing agents.
Career Highlights
Throughout his career, Achim Riemann has worked with prominent companies such as Rohm GmbH and Ronm GmbH. His experience in these organizations has allowed him to refine his skills and contribute to innovative projects in the chemical industry.
Collaborations
Riemann has collaborated with notable colleagues, including Werner Ude and Siegmund Besecke. These partnerships have fostered a creative environment that has led to advancements in their respective fields.
Conclusion
Achim Riemann's contributions to the field of chemistry, particularly through his patents and collaborations, highlight his role as an influential inventor. His work continues to inspire innovation in the development of phosphorus compounds and related technologies.
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