Recently there has been much controversy concerning the use of DOT as a pesticide. This has resulted in partial or total ban on it in several countries. In this country DOT is being phased out over a period of two years (1.). In 1.968 DOT was removed from recommended compounds for tobacco (3).. lnspite of the removal of DOT as a pesticide for tobacco our studies are important for two reasons: First, tobacco leaf is cured and mellowed before .its use in the manufacture of cigarettes. This usually takes about two or three years and causes the possibility of carryover of DOT on cigarettes for several years. Second, the studies throw light on the mechanisms of the reactions involved in the degradation of pesticides in tobacco smokes. This paper is divided into two sections: Section l. deals with the isolation and identification of the degradation products from the pyrolysis of p,p'-DDT in a nitrogen atmosphere. Section 2 deals with the pyrolytic degradation of p,p'-DDT intimately mixed with tobacco. SJ:CTION 1 Pyrolysis of p,p'•DDT In a Nitrogen Atmosphere Very little work has been reported on the pyrolysis of DOT. Cavenah and ]ohns (7) have studied pyrolysis of DOT, but this was in conjunction with their method of identifying DOT by its "pyrolysis spectra". Recently, Mosier, Guenzi, and Miller (1.5) have proposed a free radical mechanism for photodecomposition of DOT. Some of their mechanisms are similar to those reported herein although reaction conditions were very different. • Presented as two papers entitled: "Isolation and Identification of the Degradation Products from the Pyrolysis of p,p'-DDT •in a Nitrogen .Atmosphere" and "Degradation of p,p'-DDT in Tobacco Smokes" before the 23rd Tobacco Chemists' Research Conference at Philadelphia, October 1969. Detailed description of the methods to be published at a later da.te.
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