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Polycyclic organic compounds, Four-membered rings

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Cyclic compounds (8)
Cycloalkanes (7)
Cyclobutanes (7)
Bicyclic compounds (3)
Polycyclic nonaromatic hydrocarbons (3)
Alkenes (2)
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Perfume ingredients (2)
Alkanes (1)
Cycloalkenes (1)
Cyclobutenes (1)
Cyclopropanes (1)
Food Additives (1)
Tetracyclic compounds (1)
Three-membered rings (1)
Tricyclic compounds (1)

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1-METHYLNAPHTHALENE (90-12-0, 1321-94-4)  
1-Methylnaphthalene is a polycyclic aromatic hydrocarbon (PAH). It has a cetane number of zero, and was previously used as the lower reference for cetane number. However, due to the expense and handling difficulty of 1-methylnaphthalene, it was replaced in this capacity by isocetane, with a CN of 15.
Biphenyl (92-52-4, 68409-73-4)  
diphenyl  ·  diphenyl, 14C-labeled
Biphenyl (or diphenyl or phenylbenzene or 1,1′-biphenyl or lemonene) is an organic compound that forms colorless crystals. Particularly in older literature, compounds containing the functional group consisting of biphenyl less one hydrogen (the site at which it is attached) may use the prefixes xenyl or diphenylyl. It has a distinctively pleasant smell.
FLUORENE (2299-68-5, 86-73-7)  
9H-fluorene
Fluorene , or 9H-fluorene, is a polycyclic aromatic hydrocarbon. It forms white crystals that exhibit a characteristic, aromatic odor similar to that of naphthalene. It is combustible.
CHRYSENE (65996-93-2, 50-32-8, 218-01-9)  
Chrysene is a polycyclic aromatic hydrocarbon (PAH) with the molecular formula C 18H 12 that consists of four fused benzene rings. It is a natural constituent of coal tar, from which it was first isolated and characterized. It is also found in creosote at levels of 0.5-6 mg/kg.
ACENAPHTHENE (83-32-9)  
Acenaphthene is a polycyclic aromatic hydrocarbon (PAH) consisting of naphthalene with an ethylene bridge connecting positions 1 and 8. It is a colourless solid. Coal tar consists of about 0.3% of this compound.
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Polycyclic organic compounds
Four-membered rings
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