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 101 to 164 of 164 compounds
![4-(Benzyloxy)-3'-methoxy[1,1'-biphenyl]-3-carbaldehyde chemical structure, C21H18O3, CAS 893735-46-1](/s/YBHLVRCKUZCVNJ-UHFFFAOYSA-N.svg)
4-(Benzyloxy)-3'-methoxy[1,1'-biphenyl]-3-carbaldehyde
CAS 893735-46-1C21H18O3
![4-(Benzyloxy)-2'-methoxy[1,1'-biphenyl]-3-carbaldehyde chemical structure, C21H18O3, CAS 893735-48-3](/s/BKXDPXXOEQIDDF-UHFFFAOYSA-N.svg)
4-(Benzyloxy)-2'-methoxy[1,1'-biphenyl]-3-carbaldehyde
CAS 893735-48-3C21H18O3
![Methyl 2'-(benzyloxy)[1,1'-biphenyl]-3-carboxylate chemical structure, C21H18O3, CAS 893736-43-1](/s/RHAJYIKKWZSFPU-UHFFFAOYSA-N.svg)
Methyl 2'-(benzyloxy)[1,1'-biphenyl]-3-carboxylate
CAS 893736-43-1C21H18O3
Methyl 4-Benzyloxy-2-phenylbenzoate
CAS 216086-66-7C21H18O3
(2Z)-2-(2,2-Dimethyl-5-phenylfuran-3(2H)-ylidene)-3-oxo-3-phenylpropanal
CAS 54620-59-6C21H18O3
![Methyl 5-hydroxy-3,9-dimethyl-7H-benzo[c]fluorene-7-carboxylate chemical structure, C21H18O3, CAS 1300688-67-8](/s/KPDNDHALLPQNSB-UHFFFAOYSA-N.svg)
Methyl 5-hydroxy-3,9-dimethyl-7H-benzo[c]fluorene-7-carboxylate
CAS 1300688-67-8C21H18O3
1,5-Bis(2-acetylphenyl)-1,4-pentadien-3-one
CAS 848243-37-8C21H18O3
4-Methoxy-3-(4-methoxyphenyl)benzophenone
CAS 1416152-54-9C21H18O3
(1R)-1,4-Anhydro-2-deoxy-1-pyren-1-yl-D-erythro-pentitol
CAS 180420-86-4C21H18O3
![3-[[(3-Methyl[1,1'-biphenyl]-4-yl)oxy]methyl]benzoic acid chemical structure, C21H18O3, CAS 2492595-20-5](/s/MZPNIXRXGFEDPO-UHFFFAOYSA-N.svg)
3-[[(3-Methyl[1,1'-biphenyl]-4-yl)oxy]methyl]benzoic acid
CAS 2492595-20-5C21H18O3
1,9,10-Trihydroxy-9,10-dihydro-3-methylcholanthrene
CAS 68780-95-0C21H18O3
Benzoic acid, 2-((4-methylphenyl)phenylmethoxy)-
CAS 72417-80-2C21H18O3
![6-Ethyl-2,5-dimethyl-3-phenyl-7H-furo[3,2-g]chromen-7-one chemical structure, C21H18O3, CAS 858750-97-7](/s/XBWZIPRDTJDCPP-UHFFFAOYSA-N.svg)
6-Ethyl-2,5-dimethyl-3-phenyl-7H-furo[3,2-g]chromen-7-one
CAS 858750-97-7C21H18O3
2-Propen-1-one, 1-(2,4-dimethoxyphenyl)-3-(1-naphthalenyl)-
CAS 61595-17-3C21H18O3
1-Naphthalenecarboxylic acid, 2-(2,3-dihydro-2-d-1H-inden-1-yl-2-d)-6-methoxy-
CAS 111238-13-2C21H18O3
3-(6-Methoxy-2-naphthyl)-1-(4-methoxyphenyl)-2-propen-1-one
CAS 1319718-64-3C21H18O3
Propionic acid,2-(4-biphenylyl)-3-hydroxy-3-phen
CAS 93371-43-8C21H18O3
4,6-Dimethoxy-2-methyl-3-(naphthalen-2-yl)-1-benzofuran
CAS 922140-86-1C21H18O3
![4-Methylphenyl [([1,1'-biphenyl]-4-yl)oxy]acetate chemical structure, C21H18O3, CAS 62952-03-8](/s/VPMDQZZKSLYEOG-UHFFFAOYSA-N.svg)
4-Methylphenyl [([1,1'-biphenyl]-4-yl)oxy]acetate
CAS 62952-03-8C21H18O3
2-Methoxy-6-(2-naphthalen-2-yl-vinyl)-benzoic acid methyl ester
CAS 1171924-85-8C21H18O3
2-Methoxy-6-(2-naphthalen-1-yl-vinyl)-benzoic acid methyl ester
CAS 1171921-69-9C21H18O3
2-(2,2-Dimethylpropanoyl)-3-phenylnaphthalene-1,4-dione
CAS 218284-23-2C21H18O3
2-Benzyloxy-benzoic Acid-13C3 Benzyl Ester
CAS 1330189-10-0C21H18O3
2-Hydroxy-3-phenoxy-1,2-diphenylpropan-1-one
CAS 352351-94-1C21H18O3
- 1-(3,4-Dimethoxyphenyl)-3-naphthalen-2-ylprop-2-en-1-one870770-71-1C21H18O3
- 4,6-Dimethoxy-2-methyl-3-(naphthalen-1-yl)-1-benzofuran922140-84-9C21H18O3
- 1-Phenylethyl 4-phenoxybenzoate90139-27-8C21H18O3
- 3-BenZyl-4-(benZyloxy)benZoic acid2918865-80-0C21H18O3
- 2,6,11-Trimethoxytriphenylene1088995-25-8C21H18O3
- 5-[(1E)-2-(4-Hydroxyphenyl)ethenyl]-2-(phenylmethyl)-1,3-benzenediol1610531-11-7C21H18O3
- 2-(3'-(Benzyloxy)-[1,1'-biphenyl]-2-yl)acetic acid2819691-34-2C21H18O3
- 2-(4'-(Benzyloxy)-[1,1'-biphenyl]-2-yl)acetic acid2801182-91-0C21H18O3
- (2R,3R,4S)-4-Phenoxy-2-phenyl-3,4-dihydro-2H-1-benzopyran-3-ol35094-94-1C21H18O3
- 1-[4-(1-Methylethyl)benzoyl]-2-naphthalenecarboxylic acid856209-36-4C21H18O3
- Methyl 4,5-dimethyl-2-(2-naphthalenylcarbonyl)benzoate859034-52-9C21H18O3
- 1a,2,3,6,7,11c-Hexahydro-8-methylindeno(7',1':6,7,8)phenanthro(3,4-b)oxirene-2,3-diol (1aalpha,2beta,3alpha,11calpha)-99032-32-3C21H18O3
- 3-[4-(Propan-2-yl)benzoyl]naphthalene-2-carboxylic acid62775-12-6C21H18O3
- 2-(4-Propylbenzoyl)spiro[cyclopropane-1,2'-indene]-1',3'-dione61124-65-0C21H18O3
- 5,8-Dimethoxy-3-phenyl-2,3-dihydro-1H-cyclopenta[a]naphthalen-1-one89296-28-6C21H18O3
- Methyl 2'-(benzyloxy)[1,1'-biphenyl]-4-carboxylate893736-40-8C21H18O3
- Methyl 4'-(benzyloxy)[1,1'-biphenyl]-3-carboxylate893736-46-4C21H18O3
- Methyl 3'-(benzyloxy)[1,1'-biphenyl]-2-carboxylate893736-57-7C21H18O3
- 2-(2,3-Dihydro-7-methoxy-1H-phenalen-1-yl)-benzoic Acid1391054-77-5C21H18O3
- 4-(Benzyloxy)naphthalen-1-yl 2-methylprop-2-enoate113918-64-2C21H18O3
- 3-(3-Phenoxypropoxy)dibenzo[b,d]furan143522-12-7C21H18O3
- [2,4-Dihydroxy-5-(1-phenylethyl)phenyl](phenyl)methanone43221-41-6C21H18O3
- Benzoic acid--2,2-diphenylethen-1-ol (1/1)86123-17-3C21H18O3
- 1-(2,6-Dimethoxyphenyl)-3-(naphthalen-2-yl)prop-2-en-1-one914384-19-3C21H18O3
- 1-(3,5-Dimethoxyphenyl)-3-(naphthalen-2-yl)prop-2-en-1-one914383-88-3C21H18O3
- 1-(3,5-Dimethoxyphenyl)-3-(naphthalen-1-yl)prop-2-en-1-one914383-87-2C21H18O3
- 1-(2,6-Dimethoxyphenyl)-3-(naphthalen-1-yl)prop-2-en-1-one914383-82-7C21H18O3
- 1-(2,5-Dimethoxyphenyl)-3-naphthalen-1-ylprop-2-en-1-one914383-78-1C21H18O3
- 2-(4-Methoxyphenyl)-2,2-diphenylacetic acid1094039-07-2C21H18O3
- 4-(Benzyloxy)-3'-methyl-[1,1'-biphenyl]-3-carboxylic acid3078377-06-4C21H18O3
- 4-(Benzyloxy)-2'-methyl-[1,1'-biphenyl]-3-carboxylic acid3078351-82-0C21H18O3
- 6-(Benzyloxy)-2'-methoxy-[1,1'-biphenyl]-3-carbaldehyde3078344-09-6C21H18O3
- 6-(Benzyloxy)-3'-methoxy-[1,1'-biphenyl]-3-carbaldehyde3078379-65-1C21H18O3
- 6-(Benzyloxy)-4'-methoxy-[1,1'-biphenyl]-3-carbaldehyde3078376-12-9C21H18O3
- 5-Methoxy-3,4-dihydro-2H-spiro[naphthalene-1,2'-naphtho[1,8-de][1,3]dioxine]207504-79-8C21H18O3
- 1-(2,5-Dimethoxyphenyl)-3-naphthalen-2-ylprop-2-en-1-one914383-79-2C21H18O3
- Benzhydryl 3-(hydroxymethyl)benzoate1225210-73-0C21H18O3
- Benzhydryl 2-(hydroxymethyl)benzoate1225210-79-6C21H18O3
- Ethyl 4-(2-(naphthalen-2-yl)-2-oxoethyl)benzoate1232578-70-9C21H18O3
- (E)-7-((4-(Buta-1,3-dien-1-yl)benzyl)oxy)-4-methyl-2H-chromen-2-one3041999-68-9C21H18O3
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 4-(Benzyloxy)-3'-methoxy[1,1'-biphenyl]-3-carbaldehyde, 4-(Benzyloxy)-2'-methoxy[1,1'-biphenyl]-3-carbaldehyde, Methyl 2'-(benzyloxy)[1,1'-biphenyl]-3-carboxylate. 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.