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- https://chem.libretexts.org/Courses/Smith_College/CHM_223_Chemistry_III%3A_Organic_Chemistry_(2024)/10%3A_Benzene_and_Aromaticity/10.07%3A_Polycyclic_Aromatic_CompoundsThe six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the term...The six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the terminal ring atoms (in the structure below, note that the top right and center right rings are not attached to one another).
- https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Organic_Chemistry_(Morsch_et_al.)/15%3A_Benzene_and_Aromaticity/15.06%3A_Polycyclic_Aromatic_CompoundsThe six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the term...The six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the terminal ring atoms (in the structure below, note that the top right and center right rings are not attached to one another).
- https://chem.libretexts.org/Courses/Smith_College/Organic_Chemistry_(LibreTexts)/15%3A_Benzene_and_Aromaticity/15.07%3A_Polycyclic_Aromatic_CompoundsThe six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the term...The six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the terminal ring atoms (in the structure below, note that the top right and center right rings are not attached to one another).
- https://chem.libretexts.org/Workbench/LCDS_Organic_Chemistry_OER_Textbook_-_Todd_Trout/15%3A_Benzene_and_Aromaticity/15.07%3A_Polycyclic_Aromatic_CompoundsNaphthalene has a cyclic, conjugated π electron system, with p orbital overlap both along the ten-carbon periphery of the molecule and across the central bond. Among the many biological molecules that...Naphthalene has a cyclic, conjugated π electron system, with p orbital overlap both along the ten-carbon periphery of the molecule and across the central bond. Among the many biological molecules that contain polycyclic aromatic rings, the amino acid tryptophan contains an indole ring and the antimalarial drug quinine contains a quinoline ring.
- https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Organic_Chemistry_(OpenStax)/15%3A_Benzene_and_Aromaticity/15.06%3A_Polycyclic_Aromatic_CompoundsThe Hückel rule is strictly applicable only to monocyclic compounds, but the general concept of aromaticity can be extended to include polycyclic aromatic compounds. Naphthalene, with two benzene-like...The Hückel rule is strictly applicable only to monocyclic compounds, but the general concept of aromaticity can be extended to include polycyclic aromatic compounds. Naphthalene, with two benzene-like rings fused together; anthracene, with three rings; benzo[a]pyrene, with five rings; and coronene, with six rings, are all well-known aromatic hydrocarbons.
- https://chem.libretexts.org/Courses/Alma_College/Organic_Chemistry_I_(Alma_College)/02%3A_Conjugation_Resonance_and_Aromaticity/2.10%3A_Polycyclic_Aromatic_CompoundsThe six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the term...The six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the terminal ring atoms (in the structure below, note that the top right and center right rings are not attached to one another).
- https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Organic_Chemistry_II_(Morsch_et_al.)/15%3A_Benzene_and_Aromaticity/15.06%3A_Polycyclic_Aromatic_CompoundsThe six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the term...The six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the terminal ring atoms (in the structure below, note that the top right and center right rings are not attached to one another).
- https://chem.libretexts.org/Courses/can/CHEM_232_-_Organic_Chemistry_II_(Puenzo)/02%3A_Benzene_and_Aromaticity/2.07%3A_Polycyclic_Aromatic_CompoundsThe six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the term...The six benzene rings in coronene are fused in a planar ring; whereas the six rings in hexahelicene are not joined in a larger ring, but assume a helical turn, due to the crowding together of the terminal ring atoms (in the structure below, note that the top right and center right rings are not attached to one another).
- https://chem.libretexts.org/Workbench/Pick_Your_Poison%3A_Introduction_to_Materials_Toxicology/23%3A_Benzene_and_Aromaticity/23.07%3A_Polycyclic_Aromatic_CompoundsThe Hückel rule is strictly applicable only to monocyclic compounds, but the general concept of aromaticity can be extended to include polycyclic aromatic compounds. Naphthalene, with two benzene-like...The Hückel rule is strictly applicable only to monocyclic compounds, but the general concept of aromaticity can be extended to include polycyclic aromatic compounds. Naphthalene, with two benzene-like rings fused together; anthracene, with three rings; benzo[a]pyrene, with five rings; and coronene, with six rings, are all well-known aromatic hydrocarbons.
