Molecular formula
C21H18O3
164 compounds have this formula on CompoundList.
- Molar mass
- 318.37g/mol
- Monoisotopic mass
- 324.1457Da
- Atoms
- 42
- Elements
- 3
- Rings plus double bonds
- 13
The formula C21H18O3 describes a molecule made of 21 carbon atoms, 18 hydrogen atoms and 3 oxygen atoms. 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 × 2179.23%12.011 × 21 = 252.231 g/mol
- H Hydrogen × 185.70%1.008 × 18 = 18.144 g/mol
- O Oxygen × 315.08%15.999 × 3 = 47.997 g/mol
Look up another formula
Compounds with the formula C21H18O3
Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.
Showing 1 to 100 of 164 compounds
(2S)-2-(Biphenyl-4-yloxy)-3-phenylpropanoic acid
CAS 862901-87-9C21H18O3
3,4-Bis(benzyloxy)benzaldehyde
CAS 5447-02-9C21H18O3
3,5-Dibenzyloxybenzaldehyde
CAS 14615-72-6C21H18O3
![5-Methyl-3-phenyl-6-propyl-7H-furo[3,2-g]chromen-7-one chemical structure, C21H18O3, CAS 374760-78-8](/s/MPWUURJWEYUZQS-UHFFFAOYSA-N.svg)
5-Methyl-3-phenyl-6-propyl-7H-furo[3,2-g]chromen-7-one
CAS 374760-78-8C21H18O3
9,10-Dihydroxy-7,8-epoxy-7,8,9,10-tetrahydro-3-methylcholanthrene
CAS 79647-25-9C21H18O3
1-(3-Methoxyphenyl)-2-(2-phenylphenoxy)ethanone
CAS 540520-47-6C21H18O3
![8-Benzyl-3,4,9-trimethyl-7H-furo[2,3-f]chromen-7-one chemical structure, C21H18O3, CAS 374766-68-4](/s/ORJCBKPUZUBSPQ-UHFFFAOYSA-N.svg)
8-Benzyl-3,4,9-trimethyl-7H-furo[2,3-f]chromen-7-one
CAS 374766-68-4C21H18O3
3-(Furan-2-yl)-1,5-diphenylpentane-1,5-dione
CAS 80921-39-7C21H18O3
(1,1'-Biphenyl)-4-yl 4-ethoxybenzoate
CAS 55673-01-3C21H18O3
3-(6-Benzyloxy-naphthalen-2-yl)-acrylic acid methyl ester
CAS 851124-28-2C21H18O3
Coumanolignan
CAS 1033749-97-1C21H18O3
Benzoic acid, 4-(phenylmethoxy)-, phenylmethyl ester
CAS 56442-22-9C21H18O3
1,1,2-Tris(4-hydroxyphenyl)prop-1-ene
CAS 68373-13-7C21H18O3
![5-[(1E)-2-[4-(Phenylmethoxy)phenyl]ethenyl]-1,3-benzenediol chemical structure, C21H18O3, CAS 637776-91-1](/s/GIBUZCYDDPTVFK-VOTSOKGWSA-N.svg)
5-[(1E)-2-[4-(Phenylmethoxy)phenyl]ethenyl]-1,3-benzenediol
CAS 637776-91-1C21H18O3
2,4-Bis(benzyloxy)benzaldehyde
CAS 13246-46-3C21H18O3
2,5-Bis(benzyloxy)benzaldehyde
CAS 6109-54-2C21H18O3
![4-Methoxy-3-[(4-phenylphenoxy)methyl]benzaldehyde chemical structure, C21H18O3, CAS 832740-79-1](/s/VMEPEELTOQVPBJ-UHFFFAOYSA-N.svg)
4-Methoxy-3-[(4-phenylphenoxy)methyl]benzaldehyde
CAS 832740-79-1C21H18O3
![3-[(1E)-2-(4-Hydroxyphenyl)ethenyl]-5-(phenylmethoxy)-phenol chemical structure, C21H18O3, CAS 678149-02-5](/s/DQRVEESLGDZHMJ-VOTSOKGWSA-N.svg)
3-[(1E)-2-(4-Hydroxyphenyl)ethenyl]-5-(phenylmethoxy)-phenol
CAS 678149-02-5C21H18O3
1-(3,4-Dimethoxyphenyl)-3-(naphthalen-1-yl)prop-2-en-1-one
CAS 935661-97-5C21H18O3
9-(Phenylethynyl)-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-dione
CAS 16807-57-1C21H18O3
![3-[3-(Benzyloxy)phenyl]phenylacetic acid chemical structure, C21H18O3, CAS 1013405-79-2](/s/JQQXZQKQAYXIHW-UHFFFAOYSA-N.svg)
3-[3-(Benzyloxy)phenyl]phenylacetic acid
CAS 1013405-79-2C21H18O3
Phenylmethyl 2-(phenylmethoxy)benzoate
CAS 14389-87-8C21H18O3
1,9,10-Trihydroxy-9,10-dihydro-3-methylcholanthrene (1-alpha,9-beta,10-alpha)
CAS 65799-05-5C21H18O3
4-(Benzyloxy)phenyl 3-methylbenzoate
CAS 5162-11-8C21H18O3
- (1,1'-Biphenyl)-4-propanoic acid, beta-hydroxy-alpha-phenyl-, (R*,S*)-(-)-119725-38-1C21H18O3
- Dibenzyloxybenzaldehyde5779-91-9C21H18O3
- 4-(4-Benzyloxyphenyl)-3-methylbenzoic acid167627-35-2C21H18O3
- Benzyl diphenylglycolate16648-50-3C21H18O3
- Diphenylmethyl 4-methoxybenzoate53914-68-4C21H18O3
- 7-[(4-Ethenylbenzyl)oxy]-2,3-dihydrocyclopenta[c]chromen-4(1H)-one314743-63-0C21H18O3
- 3-((1,1'-Biphenyl)-4-yl)-3-hydroxy-3-phenylpropanoic acid71315-03-2C21H18O3
- 4-(3-Benzyloxyphenyl)-3-methylbenzoic acid1261911-97-0C21H18O3
- 3-(4-Benzyloxyphenyl)-2-methylbenzoic acid1262011-09-5C21H18O3
- 3-Hydroxy-2,3,3-triphenylpropanoic acid4347-27-7C21H18O3
- 4-(Benzyloxy)phenyl 4-methylbenzoate425402-81-9C21H18O3
- 2-Methoxyphenyl diphenylacetate433320-36-6C21H18O3
- 4'-Methylbiphenyl-4-yl 3-methoxybenzoate301656-75-7C21H18O3
- 3-(5-(4-Methoxyphenyl)-2-furyl)-1-(4-methylphenyl)-2-propen-1-one5528-80-3C21H18O3
- 1-(4-(Benzyloxy)-2-hydroxyphenyl)-2-phenylethanone39604-80-3C21H18O3
- Methyl 3-benzyloxy-5-phenylbenzoate168619-24-7C21H18O3
- Methyl 4'-(benzyloxy)-[1,1'-biphenyl]-2-carboxylate893736-49-7C21H18O3
- 4-[3-(Benzyloxy)phenyl]phenylacetic acid893640-40-9C21H18O3
- 2-(3-Benzyloxyphenyl)-5-methylbenzoic acid1261938-56-0C21H18O3
- (4-Methoxy-2-phenylmethoxyphenyl)-phenylmethanone24598-35-4C21H18O3
- 3,4-Dimethoxy-4'-phenylbenzophenone116413-64-0C21H18O3
- Methyl 4'-(benzyloxy)[1,1'-biphenyl]-4-carboxylate126675-89-6C21H18O3
- Methyl 3'-(benzyloxy)[1,1'-biphenyl]-3-carboxylate893736-53-3C21H18O3
- 4-{[4-(Benzyloxy)phenyl]methoxy}benzaldehyde88015-49-0C21H18O3
- 3-(2-Benzyloxyphenyl)-2-methylbenzoic acid1261915-24-5C21H18O3
- 3-(3-Benzyloxyphenyl)-2-methylbenzoic acid1261989-94-9C21H18O3
- 2-(4-Benzyloxyphenyl)-5-methylbenzoic acid1261939-02-9C21H18O3
- 3-(4-Benzyloxyphenyl)phenylacetic acid1355248-18-8C21H18O3
- 6-Ethyl-5,9-dimethyl-3-phenylfuro[3,2-g]chromen-7-one309291-58-5C21H18O3
- 4-(3,5-Dimethylbenzofuran-2-yl)-6,7-dimethyl-2H-chromen-2-one858763-21-0C21H18O3
- 2-Phenoxyethyl 4-phenylbenzoate791787-66-1C21H18O3
- (1,1'-Biphenyl)-4-propanoic acid, beta-hydroxy-alpha-phenyl-, (R*,R*)-(+)-119725-33-6C21H18O3
- 2,6-Bis-benzyloxybenzaldehyde25983-53-3C21H18O3
- 2-Benzyloxy-6-methylbiphenyl-3'-carboxylic acid1420800-42-5C21H18O3
- 2-Methyl-3-phenyl-5-propyl-7H-furo[3,2-g]chromen-7-one374761-71-4C21H18O3
- 6-Benzyl-2,3,5-trimethyl-7H-furo[3,2-g]chromen-7-one374701-65-2C21H18O3
- 1-(4-Methoxyphenyl)-2-(4-phenylphenoxy)ethanone540520-76-1C21H18O3
- 4-(3,5-Dimethyl-1-benzofuran-2-yl)-7,8-dimethylchromen-2-one637753-37-8C21H18O3
- 7-{[(E)-3-Phenyl-2-propenyl]oxy}-2,3-dihydrocyclopenta[c]chromen-4(1H)-one314743-66-3C21H18O3
- 2-(2-Benzyloxyphenyl)-6-methylbenzoic acid1261937-81-8C21H18O3
- 4-(2-Benzyloxyphenyl)-3-methylbenzoic acid1261995-93-0C21H18O3
- 2-(3-Benzyloxyphenyl)-6-methylbenzoic acid1261938-46-8C21H18O3
- 2-(4-Benzyloxyphenyl)-6-methylbenzoic acid1261968-70-0C21H18O3
- 1,9,10-Trihydroxy-9,10-dihydro-3-methylcholanthrene (1-alpha,9-alpha,10-beta)65831-43-8C21H18O3
- 6-Benzyl-3,5,9-trimethyl-7H-furo[3,2-g]chromen-7-one374706-78-2C21H18O3
- 1-(3-Methoxyphenyl)-2-(4-phenylphenoxy)ethanone129691-51-6C21H18O3
- Benzyl 3-(benzyloxy)benzoate54396-39-3C21H18O3
- Benzoic acid, 4-(hydroxydiphenylmethyl)-, methyl ester197526-11-7C21H18O3
- 2-(Trityloxy)acetic acid37076-47-4C21H18O3
- Methyl 3'-(benzyloxy)[1,1'-biphenyl]-4-carboxylate122294-02-4C21H18O3
- 1-(6-Methoxy-2-naphthyl)-3-(4-methoxyphenyl)-2-propen-1-one1007360-06-6C21H18O3
- 2-(2-Benzyloxyphenyl)-5-methylbenzoic acid1261937-88-5C21H18O3
- Diphenylmethyl alpha-hydroxybenzeneacetate61490-08-2C21H18O3
- 3-(Biphenyl-4-yloxymethyl)benzoic acid methyl ester198894-39-2C21H18O3
- (1,1'-Biphenyl)-4-ol, 4'-(phenylmethoxy)-, 4-acetate52189-88-5C21H18O3
- 3,6-Dimethoxy-9-phenyl-9H-fluoren-9-ol6161-49-5C21H18O3
- 2,5,6,9-Tetramethyl-3-phenyl-7H-furo[3,2-g]chromen-7-one374761-30-5C21H18O3
- 9-Methyl-3-phenyl-5-propyl-7H-furo[3,2-g]chromen-7-one374707-20-7C21H18O3
- 2,4,8,9-Tetramethyl-3-phenyl-7H-furo[2,3-f]chromen-7-one670241-74-4C21H18O3
- 3-tert-Butyl-5-phenyl-7H-furo[3,2-g]chromen-7-one858748-56-8C21H18O3
- 5-Butyl-3-phenyl-7H-furo[3,2-g]chromen-7-one374764-74-6C21H18O3
- 1-(6-Methoxy-2-naphthyl)-3-(3-methoxyphenyl)-2-propen-1-one360576-14-3C21H18O3
- Methanone, [3-methoxy-4-(phenylmethoxy)phenyl]phenyl-96306-54-6C21H18O3
- Acetic acid, ([1,1'-biphenyl]-4-yloxy)-, phenylmethyl ester62323-18-6C21H18O3
- Ethyl 2-(9-anthracenylmethylene)-3-oxobutanoate73758-53-9C21H18O3
- 9-(2,6-Dimethoxyphenyl)-9H-fluoren-9-ol24310-53-0C21H18O3
- 4'-Methyl[1,1'-biphenyl]-4-yl 2-methoxybenzoate352333-07-4C21H18O3
- 6-Isopropyl-5-methyl-3-phenyl-7H-furo[3,2-g]chromen-7-one858747-41-8C21H18O3
- 3-(3,5-Dimethoxyphenyl)-1-naphthalen-2-ylprop-2-en-1-one175205-23-9C21H18O3
- 4-Methoxyphenyl diphenylacetate58241-13-7C21H18O3
- Benzeneacetic acid, 4-([1,1'-biphenyl]-2-ylmethoxy)-833484-44-9C21H18O3
- Benzeneacetic acid, 4-([1,1'-biphenyl]-2-yloxy)-, methyl ester832731-00-7C21H18O3
- Benzeneacetic acid, 4-([1,1'-biphenyl]-3-yloxy)-, methyl ester832731-02-9C21H18O3
- (1,1'-Biphenyl)-4-propanoic acid, beta-hydroxy-alpha-phenyl-, (R*,R*)-(-)-119725-34-7C21H18O3
- (2E)-3-[4-(Benzyloxy)phenyl]-1-(5-methylfuran-2-yl)prop-2-en-1-one1061866-12-3C21H18O3
- 4-(Benzyloxy)-4'-methoxy[1,1'-biphenyl]-3-carbaldehyde893735-43-8C21H18O3
Frequently asked questions
What is the molar mass of C21H18O3?
The molar mass of C21H18O3 is 318.37 g/mol, calculated from standard atomic weights for 21 carbon atoms, 18 hydrogen atoms and 3 oxygen atoms. The monoisotopic mass is 324.1457 Da.
How many compounds have the formula C21H18O3?
CompoundList lists 164 compounds with the molecular formula C21H18O3, including (2S)-2-(Biphenyl-4-yloxy)-3-phenylpropanoic acid, 3,4-Bis(benzyloxy)benzaldehyde, 3,5-Dibenzyloxybenzaldehyde. 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 C21H18O3?
C21H18O3 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.