Abstract
A survey has been made of the nature of the peroxides occurring in the combustion of isobutane below and above the lower cool-flame limit. The peroxides were resolved and partially identified by paper chromatography. Below the cool-flame limit, the peroxide is found to be mostly tert-butyl hydroperoxide, with some hydrogen peroxide, but as the cool-flame limit is approached the proportion of tert-butyl hydroperoxide declines, while that of hydrogen peroxide increases. In addition, peroxides identified as aldehyde and acid peroxides increase as the cool-flame limit is approached. No tert-butyl hydroperoxide appears to survive the cool flame, although copious quantities of aldehyde peroxide and hydrogen peroxide remain.

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