Molecular formula
C21H18O
82 compounds have this formula on CompoundList.
- Molar mass
- 286.37g/mol
- Monoisotopic mass
- 286.1358Da
- Atoms
- 40
- Elements
- 3
- Rings plus double bonds
- 13
The formula C21H18O describes a molecule made of 21 carbon atoms, 18 hydrogen atoms and 1 oxygen atom. It is written in Hill notation: carbon first, then hydrogen, then the other elements in alphabetical order. The formula tells you which atoms are present, not how they are connected, which is why several different chemicals can share it.
Elemental composition
- C Carbon × 2188.08%12.011 × 21 = 252.231 g/mol
- H Hydrogen × 186.34%1.008 × 18 = 18.144 g/mol
- O Oxygen × 15.59%15.999 × 1 = 15.999 g/mol
Look up another formula
Compounds with the formula C21H18O
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 82 of 82 compounds
Propiophenone, 3,3-diphenyl-
CAS 606-86-0C21H18O
1,1,1-Triphenylacetone
CAS 795-36-8C21H18O
1,9-Diphenylnona-1,3,6,8-tetraen-5-one
C21H18O
5-Phenyl-10,11-dihydro-5H-dibenzo(A,D)cyclohepten-5-ol
CAS 55090-32-9C21H18O
Dicinnamalacetone
CAS 622-21-9C21H18O
2H-1-Benzopyran, 3,4-dihydro-2,2-diphenyl-
CAS 10419-28-0C21H18O
3-Methoxy-7,12-dimethylbenz(a)anthracene
CAS 66240-02-6C21H18O
2-Methoxy-7,12-dimethylbenz(a)anthracene
CAS 66240-30-0C21H18O
4-Methoxy-7,12-dimethylbenz(a)anthracene
CAS 16277-49-9C21H18O
Benzophenone, 4-phenethyl-
CAS 91036-10-1C21H18O
AE-477/13519023
CAS 55256-25-2C21H18O
Cinnamyl alcohol, alpha,alpha-diphenyl-
CAS 4663-36-9C21H18O
Benz(a)anthracene, 7-(ethoxymethyl)-
CAS 63019-29-4C21H18O
Benz(a)anthracene, 7-(methoxymethyl)-12-methyl-
CAS 13345-60-3C21H18O
Methanone, (2,3-dihydro-7-methyl-1H-inden-4-yl)-1-naphthalenyl-
CAS 63665-87-2C21H18O
Benz(a)anthracene-7-ethanol, 12-methyl-
CAS 13345-58-9C21H18O
Benz(a)anthracene, 5-methoxy-7,12-dimethyl-
CAS 53306-03-9C21H18O
1,2,3-Triphenylpropan-1-one
CAS 4842-45-9C21H18O
1,3,6,8-Nonatetraen-5-one, 1,9-diphenyl-
C21H18O
1,2-Diphenyl-1-(p-methoxyphenyl)ethylene
CAS 1233-23-4C21H18O
Benzene, 1-(2,2-diphenylethenyl)-4-methoxy-
CAS 18648-74-3C21H18O
7-Ethyl-5-methoxybenz(a)anthracene
CAS 63020-60-0C21H18O
7-Ethoxy-12-methylbenz(a)anthracene
CAS 16354-48-6C21H18O
![Benz[a]anthracene-5-methanol, 7,12-dimethyl- chemical structure, C21H18O, CAS 34698-68-5](/s/RRHBLJOZQYJMCR-UHFFFAOYSA-N.svg)
Benz[a]anthracene-5-methanol, 7,12-dimethyl-
CAS 34698-68-5C21H18O
- (1-Methoxy-2,2-diphenylethenyl)benzene62456-54-6C21H18O
- 4-(Diphenylmethylidene)-2,6-dimethylcyclohexa-2,5-dien-1-one13135-13-2C21H18O
- 4'-Ethyl-4-benzoyl-biphenyl140621-37-0C21H18O
- 1-(Naphthalene-2-ylmethyl)-3,4-dihydronaphthalene-2(1H)-one263714-30-3C21H18O
- 7-Methyl-7,8,9,10-tetrahydrobenzo(a)pyren-7-ol83516-21-6C21H18O
- 10-Methyl-7,8,9,10-tetrahydrobenzo(a)pyren-10-ol87550-04-7C21H18O
- 6-Methyl-1,1-diphenyl-1,3-dihydro-2-benzofuran10126-32-6C21H18O
- 1,2,3-Triphenyl-2-propen-1-ol57015-16-4C21H18O
- 2-Propanone, 1,1,3-triphenyl-1232-40-2C21H18O
- 2-(4-Methylphenyl)-1,2-diphenylethan-1-one50353-99-6C21H18O
- 2-(8-Phenylocta-1,7-diyn-1-yl)benzaldehyde96964-48-6C21H18O
- 4-Methyl-2-(9-methyl-9H-fluoren-9-yl)phenol1796584-81-0C21H18O
- 10-Methyl-7,8,9,10-tetrahydrobenz(a)pyren-7-ol94849-92-0C21H18O
- 4-Ethenyl-alpha,alpha-diphenyl-benzenemethanol3139-86-4C21H18O
- 1-(4-Methylphenyl)-2,2-diphenylethan-1-one41993-27-5C21H18O
- Indeno[2,1-b]pyran, 2-(1-methylethyl)-4-phenyl-62225-31-4C21H18O
- 1-([1,1'-Biphenyl]-4-yl)-3-phenylpropan-1-one43008-78-2C21H18O
- 4-(Diphenylmethylidene)-3,5-dimethylcyclohexa-2,5-dien-1-one80826-92-2C21H18O
- (1,3-Dimethylbenzo[c]phenanthren-6-yl)methanol887572-45-4C21H18O
- 3-Benzyl-2,4-dimethylindeno[2,1-B]pyran62096-41-7C21H18O
- Indeno[2,1-b]pyran, 4-phenyl-2-propyl-62224-60-6C21H18O
- 4-(2,3-Diphenylcyclopropyl)phenol61078-42-0C21H18O
- 4,9-Dimethyl-2-(4-methylphenyl)indeno[2,1-B]pyran62096-53-1C21H18O
- 1-[4-(Diphenylmethyl)phenyl]ethan-1-one143870-53-5C21H18O
- (1E,3Z,6Z,8E)-1,9-Diphenylnona-1,3,6,8-tetraen-5-oneC21H18O
- 3,4-Diphenyl-3,4-dihydro-2H-1-benzopyran94866-41-8C21H18O
- Phenyl[2-(1-phenylethyl)phenyl]methanone63762-65-2C21H18O
- 4-Methyl-5,6-diphenyl-1,3-dihydro-2-benzofuran61051-08-9C21H18O
- (4'-Methyl-[1,1'-biphenyl]-2-yl)(p-tolyl)methanone1219621-18-7C21H18O
- 1-(12-Methyltetraphen-7-yl)ethan-1-ol13345-57-8C21H18O
- 3-(Propan-2-yl)tetracen-5(12H)-one62775-14-8C21H18O
- 9-Methoxy-7,12-dimethyltetraphene62078-52-8C21H18O
- 10-Methoxy-7,12-dimethyltetraphene62064-35-1C21H18O
- 8-Methoxy-7,12-dimethyltetraphene62064-43-1C21H18O
- 11-Methoxy-7,12-dimethyltetraphene62064-50-0C21H18O
- 9-Methoxy-9-(2-methylphenyl)-9H-fluorene88172-58-1C21H18O
- [9-(2-Methylphenyl)-9H-fluoren-9-yl]methanol88172-54-7C21H18O
- 9-Benzyl-1-methyl-9H-fluoren-9-ol87823-44-7C21H18O
- 4-(1,1-Diphenylprop-1-en-2-yl)phenol919789-82-5C21H18O
- (2',6'-Dimethyl-[1,1'-biphenyl]-4-yl)(phenyl)methanone1067883-66-2C21H18O
- 1-([1,1':4',1''-Terphenyl]-4-yl)propan-1-one1228926-61-1C21H18O
- 1,4-Dimethyl-2,3-diphenylbicyclo[2.2.1]hepta-2,5-dien-7-one95641-34-2C21H18O
- 1-(2,4-Dimethylphenyl)-3-(naphthalen-2-yl)prop-2-en-1-one111698-14-7C21H18O
- 2,3-Diphenyl-3a,5,6,6a-tetrahydro-1,5-methanopentalen-4(1H)-one188848-91-1C21H18O
- 2-{[(5,6-Dihydronaphthalen-2-yl)oxy]methyl}naphthalene184636-21-3C21H18O
- 1,1'-(3-Phenoxyprop-1-ene-1,3-diyl)dibenzene189322-52-9C21H18O
- 9-(4-Methoxyphenyl)-9-methyl-9H-fluorene60253-07-8C21H18O
- 1,1'-[1-(2-Methoxyphenyl)ethene-1,2-diyl]dibenzene70603-15-5C21H18O
- 3-(4-Ethynylphenyl)-1-(2,3,5,6-tetramethylphenyl)prop-2-yn-1-one827319-21-1C21H18O
- 1-(2-Methyl-4-phenylbut-3-yn-2-yl)naphthalen-2-ol919283-72-0C21H18O
- Phenyl[4-(1-phenylethyl)phenyl]methanone63762-64-1C21H18O
- 2-(Benzyloxy)-3-vinyl-1,1'-biphenyl3078431-56-5C21H18O
- 2-(2-([1,1'-Biphenyl]-4-yl)ethyl)benzaldehyde1379004-93-9C21H18O
- 2'-Methoxy-3,4-dihydro-1,1'-binaphthalene2074654-13-8C21H18O
- (4'-Methyl-[1,1'-biphenyl]-2-yl)(m-tolyl)methanone2394904-59-5C21H18O
- (4'-Methyl-[1,1'-biphenyl]-2-yl)(o-tolyl)methanone2394904-60-8C21H18O
- [(E)-1,3-Diphenylprop-2-enoxy]benzeneC21H18O
- 2-(Naphthalen-2-ylmethyl)-3,4-dihydro-2H-naphthalen-1-one55723-89-2C21H18O
Frequently asked questions
What is the molar mass of C21H18O?
The molar mass of C21H18O is 286.37 g/mol, calculated from standard atomic weights for 21 carbon atoms, 18 hydrogen atoms and 1 oxygen atom. The monoisotopic mass is 286.1358 Da.
How many compounds have the formula C21H18O?
CompoundList lists 82 compounds with the molecular formula C21H18O, including Propiophenone, 3,3-diphenyl-, 1,1,1-Triphenylacetone, 1,9-Diphenylnona-1,3,6,8-tetraen-5-one. Compounds that share a formula are isomers. They contain the same atoms arranged differently, so their properties, uses and prices can be very different.
What is the degree of unsaturation of C21H18O?
C21H18O has a degree of unsaturation of 13. That is the total number of rings and pi bonds (a double bond counts as one, a triple bond as two) in any structure with this formula.