Polychlorinated dibenzo-p-dioxins, or PCDDs, are highly toxic substances that are present in trace amounts as byproducts of some chemical manufacturing processes. They have been implicated in a number of environmental incidents—for example, the chemical contamination at Love Canal and the herbicide spraying in Vietnam. The structure of dibenzo-p-dioxin, along with the customary numbering convention, is
The most toxic PCDD is 2,3,7,8-tetrachloro-dibenzo-p-dioxin. Draw the structure of this compound. Also draw the structures of two other isomers containing four chlorine atoms.
Answer to relevant QuestionsCarboxylic acids are often written as RCOOH. What does —COOH indicate, and what does R indicate? Aldehydes are sometimes written as RCHO. What does —CHO indicate? Minoxidil (C9H15N5O) is a compound produced by the Pharmacia & Upjohn Company that has been approved as a treatment for some types of male pattern baldness. Draw a structural formula for each of the following. a. 3-methylpentanoic acid b. Ethyl methanoate c. Methyl benzoate d. 3-chloro-2,4-dimethylhexanoic acid In the presence of light, chlorine can substitute for one (or more) of the hydrogens in an alkane. For the following reactions, draw the possible monochlorination products. How would you synthesize each of the following? a. 1,2-dibromopropane from propene b. Acetone (2-propanone) from an alcohol c. Terf-butyl alcohol (2-methyl-2-propanol) from an alkene d. Propanoic acid from an alcohol
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