Document 3JGEDBzQ0O30ROk9D3KXwwj5n

Esso Re s e a r c h a n d En g in e e r in g Co mp a n y (FORMERLY STANDARD OIL DEVELOPMENT COMPANY) P. O. Box 121, Lin d e n . N. J. MEDICAL RESEARCH DIVISION ROBERT E. ECKARDT. PH. D-. M.D. DIRECTOR N. V. HENDRICKS. CH. E. HEAD INDUSTRIAL HYGIENIST HORACE W. GERARDE. PH. D.. M.D. HEAD TOXICOLOGIST BERTRAND E, BENNISON. M.D. CHIEF CLINICAL RESEARCH PHYSICIAN March 13, 1957 Dr. R. A. Kehoe University of Cincinnati College of Medicine The Kettering Laboratory Eden Avenue Cincinnati 19, Ohio Dear Dr. Kehoe: Metal Alkyls One of our research groups has evidenced some interest in working with various metal alkyls such as tetrabutyl tin, dibutyl diphenyl tin, tetracyclohexyl tin, dibutyl tin dichloride, triphenyl antimony and tetraphenyl lead. We are wondering if you have ever had any occasion to evaluate the toxicity of such metal alkyls, particularly tetraphenyl lead. We would appreciate having the benefit of your comments on this. Very truly yours, R. E. ECKARDT, M. D. By: (Mrs. )" Lois C. McTurk LCMrmew K 0020555