John Francis Oswald

Title: John Francis Oswald: Innovator in s-Triazine Chemistry

Introduction

John Francis Oswald is a notable inventor based in Woelflinswil, Switzerland. He has made significant contributions to the field of chemistry, particularly in the development of methods for synthesizing s-triazine compounds. His work has implications for various applications, including UV stabilization of organic materials.

Latest Patents

Oswald holds a patent for "Methods for the preparation of tris-aryl-o-hydroxyphenyl-s-triazines." This patent describes a three-step process for preparing 2-(2,4-dihydroxyphenyl)-4.6-diaryl-s-triazines, starting with cyanuric chloride. The first step involves the nucleophilic displacement of one chlorine atom with a phenolic moiety. The second step utilizes a Friedel-Crafts reaction with a Lewis acid catalyst, preferably aluminum chloride, to replace the remaining two chlorine atoms with aryl groups such as xylyl. The final step replaces the phenolic moiety with resorcinol using either a Lewis acid or protic acid catalyst. Additionally, the patent outlines other processes related to the preparation of various s-triazine compounds, which are useful as UV absorbers.

Career Highlights

Oswald is associated with Ciba Specialty Chemicals Corporation, where he has contributed to innovative chemical processes. His expertise in s-triazine chemistry has positioned him as a valuable asset in the field.

Collaborations

Some of his notable coworkers include Tyler A Stevenson and Michael Ackerman, who have collaborated with him on various projects within the company.

Conclusion

John Francis Oswald's contributions to the field of chemistry, particularly through his patented methods for synthesizing s-triazine compounds, highlight his innovative spirit and dedication to advancing chemical science. His work continues to have a lasting impact on the industry.