Document omQgBQgoEK6Jk41axMOeRvKkR

, i -A { .; PV *// , P ft' yA- ..' /'/> ' ,.-v- r\ / v ' . ,%i fiA pr $f' ETHYL CORPORATION RESEARCH AND ENGINEERING DEPARTMENT RESEARCH LABORATORIES - 1600 WEST EIGHT MILE ROAD FERNDALE 20, DETROIT. MICHIGAN May L936 Dr. Sylvan Witherup Sr. Research Associate The Kettering laboratory College of Medicine - Eden Avenue Cincinnati 19, Ohio Dear Dr. Witherup: Thank you for your letter of April 23* The information is being disseminated to all of the in terested parties. The new code numbers for cyclcpentadienyl manganese tricarbonyl, formerly APR-122, and methyl cyclopentadienyl manganese tricarbonyl, formerly APR-123, are now AP-30 and AP-3 respectively. It would be helpful if you would use the new numbers. The molecular weights are 20b and 2lS respectively. Unfortunately, we do not have any vapor pressure data at temperatures close to room temperature and you will probably want to make a crude estimate of the vapor pressure based on these molecular weights. Sincerely yours, HS/jtd Jcc: Dr. R. A. Kehoe Dr. F.F. Heyroth Dr. L. W. Sanders Dr. IC. V. Kitzmiller Hymin Shapiro