130. Polycyclic Aromatic Compounds Naphthalene, Anthracene & Phenanthrene

The polycyclic aromatic compounds naphthalene, anthracene and phenanthrene are introduced including their nomenclature, bonding and general reactivity as compared to benzene. The resonance structures of naphthalene and phenanthrene are used to examine the reactivity of these molecules. The susceptibility of these polycyclic molecules towards oxidation and reduction reactions is also presented.
01:35 1,2-Benzpyrene
02:49 Polycyclic Numbering
03:31 Nomenclature Compared to Benzene
04:24 Naphthalene Nomenclature
06:52 Naphth-2-ol
08:57 Bonding in Naphthalene
17:00 Resonance Structures of Phenanthrene
26:18 Polycyclic Oxidation
31:53 Polycyclic Reduction
41:04 Electrophilic Aromatic Substitution Benzene

[@dr.waseemtabassum5981]

Nice 👍👍👍

[@thechemistsden7730]

Thank you! Cheers!

[@nesrinetaha3304]

Thank you

[@thechemistsden7730]

You're welcome

[@victorious179]

Thank you sir

[@thechemistsden7730]

Welcome

[@user-ep4bv1kp2i]

Question: If naphthalene contains 2 chlorine and 5 nitro, how do we name the compound?

[@thechemistsden7730]

Both nitro and chloro are of the same low prioritization for substituent nomenclature. As such the naming according to IUPAC rules is to give the substituents the lowest possible number in the molecule. If I understand correctly and you are using IUPAC rules and place Cl at position 2 and NO2 at position 5 on the naphthalene ring, that will place the nitro in position 1 and chloro in position 6 due to the symmetry in naphthalene substituent positions. One is lower than two so the name of the molecule would be 6-chloro-1-nitronaphthalene.

[@BenardOnchieku-ny5qc]

Naming is OK but hybrids needs more explanation