K. H. NAPIER AND J. H. GREEN 



performed with a total of 10 [xg of iodonated products. Any non-iodonated 

 products are not detected, which simplifies the analysis. 



EXPERIMENTAL 



The experimental technique consisted of preparing a solution of iodine 

 containing ^^^I in the hydrocarbon^''^. This solution was then transferred 

 to a glass ampoule, and was de-gassed under high vacuum and finally sealed 

 off under vacuum. Samples were then irradiated either by ^-rays from a 

 500 mC 9oSj-_9oy source, or y-rays from a 5G ^^'Cs source. 



The resulting mixture was analysed for iodonated products by gas 

 chromatography, using as a detector a Geiger-Miiller tube which detected 

 only these products. Any products that did not contain iodine were neither 

 detected, nor determined. Chromatographic columns were, in general, 

 about 50 cm long and were packed with Celite containing silicone oil. A 

 special counter-current flushing device'^ was used to overcome the problems 

 caused by condensation and adsorption of alkyl iodides in the detector. 



RESULTS AND DISCUSSION 



Table 1 shows the results of iodine scavenging in hydrocarbons from several 

 sources. The figures given in the analyses are not complete and the per- 

 centages are calculated only on the products determined. Since the products 

 determined shown in the table can result from the direct splitting of the 

 hydrocarbon, followed by scavenging with iodine, these should be the only 

 primary products. Higher iodides and polyiodides cannot result from 



Table 1. Results of iodine scavenging in hydrocarbons 



a. C. E. McCauIry and R. H. Schuler /. Amer. chem. Soc. 79 (1957) 4008 



b. Present work — '"St /3-rays 



c. Present work — "'Cs y-rays 



d. L. Gevantman and R. R. Williams /. phys. Chem. 56 (1952) 569 Vapour phase work 



e. Present work — '"Sr p-rays 



f. This product is probably 2-iodo-3-methyl butane whereas other sec. iodides are 2- or .3-iodo-pentane 



g. This product is probably both l-iodo-2-methyl-butane and l-iodo-3-methyl-butane, whereas for pentane it is 



1-iodo-pentane 

 h. 1-iodo-pentane 

 i. Present work — "'Cs y-ravs 

 j. H. A. Dewhurst /. phys. Chem. 62 (1958) 15 

 k. Vinyl iodide present but not resolved conapletely 



89 



