Francis Hempenstall

Title: Francis Hempenstall: Innovator in Pharmaceutical Chemistry

Introduction

Francis Hempenstall is a notable inventor based in Folsom, CA, who has made significant contributions to the field of pharmaceutical chemistry. With a focus on the production of pure stereoisomers, his work has implications for the development of medications.

Latest Patents

Hempenstall holds 2 patents that showcase his innovative methods. His latest patents include "Methods for preparing d-threo-methylphenidate using diazomethane, and compositions thereof." These patents describe novel methods and systems for producing a substantially pure d-threo stereoisomer of methylphenidate or a salt thereof. In particular, the methods allow for the production of d-threo-methylphenidate hydrochloride in pure stereoisomeric form from d-threo-ritalinic acid hydrochloride using diazomethane. The described methods can be performed on a large scale, providing d-threo methylphenidate or a salt thereof, particularly the hydrochloride salt, in stereoisomerically pure form and in large quantities from a single batch reaction.

Career Highlights

Hempenstall is associated with Ampac Fine Chemicals LLC, where he applies his expertise in pharmaceutical development. His work has contributed to advancements in the production of important medications.

Collaborations

He has collaborated with notable coworkers such as Aslam A Malik and Nicholas Duda, further enhancing the innovative environment at his workplace.

Conclusion

Francis Hempenstall's contributions to pharmaceutical chemistry, particularly in the production of pure stereoisomers, highlight his role as an important inventor in the field. His patents reflect a commitment to advancing medication production methods, which can have a significant impact on healthcare.