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In the molecule 2,3,7,8-tetrachlorodibenzo-p-dioxin, the "p" means para--because each chlorine is para to an oxygen? In IUPAC nomenclature shouldn't "para" be replaced by a number?

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  • $\begingroup$ The IUPAC recommended name is given in the IUPAC Gold Book: 2,3,7,8-tetrachlorodibenzo[b,e][1,4]-dioxin $\endgroup$ – NotEvans. Jun 26 '18 at 18:01
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In the molecule 2,3,7,8-tetrachlorodibenzo-p-dioxin, the "p" means para because each chlorine is para to an oxygen?

No. The p (for “para”) indicates the dioxine isomer.

In IUPAC nomenclature, shouldn’t “para” be replaced by a number?

Yes. The preferred IUPAC name for this isomer is 1,4-dioxine.

Therefore, the corresponding name of the parent structure of the compound that is given in the question is 2,3,7,8-tetrachlorodibenzo[b,e][1,4]dioxine. The complete name is 2,3,7,8-tetrachlorodibenzo[b,e][1,4]dioxine.

The preferred IUPAC name, however, is 2,3,7,8-tetrachlorooxanthrene.

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