Company Filing History:
Years Active: 1978-1986
Title: Douglas W. Chapman: Innovator in Chemical Processes
Introduction
Douglas W. Chapman is a notable inventor based in St. Louis, MO (US). He has made significant contributions to the field of chemistry, particularly in the development of processes for preparing p-aminophenol and its alkyl substituted variants. With a total of 3 patents to his name, his work has had a meaningful impact on chemical manufacturing.
Latest Patents
Chapman's latest patents focus on innovative processes for synthesizing unsubstituted and alkyl substituted p-aminophenols. One of his patents describes a method that involves preparing a charge mixture containing nitrobenzene, a highly dissociated acid, a platinum catalyst, and a divalent sulfur compound. This mixture undergoes hydrogenation under specific conditions, resulting in the reduction of the substrate to phenylhydroxylamine. The hydroxylamine is then rearranged in the presence of acid to yield the desired p-aminophenol. Another patent outlines a similar process, emphasizing the use of lower alkyl substituted nitrobenzene substrates and detailing the conditions necessary for effective rearrangement.
Career Highlights
Douglas W. Chapman is currently associated with Mallinckrodt, Inc., where he continues to advance his research in chemical processes. His expertise in the field has positioned him as a valuable asset to his company and the broader scientific community.
Collaborations
Throughout his career, Chapman has collaborated with notable colleagues, including Douglas C. Caskey and Hugh C. Bertsch. These partnerships have fostered innovation and contributed to the successful development of his patented processes.
Conclusion
Douglas W. Chapman is a distinguished inventor whose work in chemical processes has led to significant advancements in the production of p-aminophenol. His contributions continue to influence the field and demonstrate the importance of innovation in chemistry.