Relative Rates of Free-Radical Chain Bromination

Relative Rates of Free-Radical Chain Bromination 

Purpose To determine the relative reactivities of different types of hydrogen atoms toward bromine atoms. 

Bromine is a hazardous chemical that may cause serious chemical burns. Do nor breathe its vapors or allow it to come into contact with skin. Perform all operations involving the transfer of the pure liquid or its solutions at a hood and wear latex gloves. If you get bromine on your skin, wash the area immediately with soap and warm water and soak the affected area in 0.6 M sodium thiosulfate solution for up to 3 h if the burn is particularly serious. 

Keep the 1 Af bromine in dichloromethane solution in the hood. Dispense 0.5-mL portions of it, using a pipet pump, calibrated Pasteur filter-tip pipet, or a buret fitted with a Teflon stopcock. 

Bromine reacts with acetone to produce the powerfui lachrymator a-bromoacetone, BrCH2COCH3. Do not rinse glassware containing residual bromine with acetone  

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