List of isomers of alkanes

A focused list of alkane structural isomers with formulas, names, SMILES, and source identifiers.

NameFormulaCategorySMILESPubChem CID
MethaneCH4C1 alkaneC297
EthaneC2H6C2 alkaneCC6324
PropaneC3H8C3 alkaneCCC6334
n-ButaneC4H10C4 alkane isomerCCCC7843
IsobutaneC4H10C4 alkane isomerCC(C)C6360
n-PentaneC5H12C5 alkane isomerCCCCC8003
IsopentaneC5H12C5 alkane isomerCCC(C)C6556
NeopentaneC5H12C5 alkane isomerCC(C)(C)C10041
n-HexaneC6H14C6 alkane isomerCCCCCC8058
2-MethylpentaneC6H14C6 alkane isomerCCCC(C)C7892
3-MethylpentaneC6H14C6 alkane isomerCCC(C)CC7282
2,2-DimethylbutaneC6H14C6 alkane isomerCCC(C)(C)C6403
2,3-DimethylbutaneC6H14C6 alkane isomerCC(C)C(C)C6589
n-HeptaneC7H16C7 alkane isomerCCCCCCC8900
2-MethylhexaneC7H16C7 alkane isomerCCCCC(C)C11582
3-MethylhexaneC7H16C7 alkane isomerCCCC(C)CC11507
3-EthylpentaneC7H16C7 alkane isomerCCC(CC)CC12048
2,2-DimethylpentaneC7H16C7 alkane isomerCCCC(C)(C)C11542
2,3-DimethylpentaneC7H16C7 alkane isomerCCC(C)C(C)C11260
2,4-DimethylpentaneC7H16C7 alkane isomerCC(C)CC(C)C7907
3,3-DimethylpentaneC7H16C7 alkane isomerCCC(C)(C)CC11229
2,2,3-TrimethylbutaneC7H16C7 alkane isomerCC(C)C(C)(C)C10044
n-OctaneC8H18C8 alkane isomerCCCCCCCC356
2-MethylheptaneC8H18C8 alkane isomerCCCCCC(C)C11594
3-MethylheptaneC8H18C8 alkane isomerCCCCC(C)CC11519
4-MethylheptaneC8H18C8 alkane isomerCCCC(C)CCC11512
3-EthylhexaneC8H18C8 alkane isomerCCCC(CC)CC12096
2,2-DimethylhexaneC8H18C8 alkane isomerCCCCC(C)(C)C11551
2,3-DimethylhexaneC8H18C8 alkane isomerCCCC(C)C(C)C11447
2,4-DimethylhexaneC8H18C8 alkane isomerCCC(C)CC(C)C11511
2,5-DimethylhexaneC8H18C8 alkane isomerCC(C)CCC(C)C11592
3,3-DimethylhexaneC8H18C8 alkane isomerCCCC(C)(C)CC11233
3,4-DimethylhexaneC8H18C8 alkane isomerCCC(C)C(C)CC11412
NonaneC9H20Linear alkaneCCCCCCCCC8141
DecaneC10H22Linear alkaneCCCCCCCCCC15600
UndecaneC11H24Linear alkaneCCCCCCCCCCC14257
DodecaneC12H26Linear alkaneCCCCCCCCCCCC8182
TridecaneC13H28Linear alkaneCCCCCCCCCCCCC12388
TetradecaneC14H30Linear alkaneCCCCCCCCCCCCCC12389
PentadecaneC15H32Linear alkaneCCCCCCCCCCCCCCC12391
HexadecaneC16H34Linear alkaneCCCCCCCCCCCCCCCC11006
HeptadecaneC17H36Linear alkaneCCCCCCCCCCCCCCCCC12398
OctadecaneC18H38Linear alkaneCCCCCCCCCCCCCCCCCC11635
NonadecaneC19H40Linear alkaneCCCCCCCCCCCCCCCCCCC12401
EicosaneC20H42Linear alkaneCCCCCCCCCCCCCCCCCCCC8222
2-MethyloctaneC9H20Methylalkane isomerCCCCCCC(C)C18591
3-MethyloctaneC9H20Methylalkane isomerCCCCCC(C)CC16664
4-MethyloctaneC9H20Methylalkane isomerCCCCC(C)CCC16665
2-MethylnonaneC10H22Methylalkane isomerCCCCCCCC(C)C13379
3-MethylnonaneC10H22Methylalkane isomerCCCCCCC(C)CC22202
4-MethylnonaneC10H22Methylalkane isomerCCCCCC(C)CCC28455
5-MethylnonaneC10H22Methylalkane isomerCCCCC(C)CCCC27518
2-MethyldecaneC11H24Methylalkane isomerCCCCCCCCC(C)C23415
3-MethyldecaneC11H24Methylalkane isomerCCCCCCCC(C)CC92239
4-MethyldecaneC11H24Methylalkane isomerCCCCCCC(C)CCC17835
5-MethyldecaneC11H24Methylalkane isomerCCCCCC(C)CCCC93071
2-MethylundecaneC12H26Methylalkane isomerCCCCCCCCCC(C)C23459
3-MethylundecaneC12H26Methylalkane isomerCCCCCCCCC(C)CC13845
4-MethylundecaneC12H26Methylalkane isomerCCCCCCCC(C)CCC520454
5-MethylundecaneC12H26Methylalkane isomerCCCCCCC(C)CCCC94213
2-MethyldodecaneC13H28Methylalkane isomerCCCCCCCCCCC(C)C15270
3-MethyldodecaneC13H28Methylalkane isomerCCCCCCCCCC(C)CC28469
4-MethyldodecaneC13H28Methylalkane isomerCCCCCCCCC(C)CCC521958
5-MethyldodecaneC13H28Methylalkane isomerCCCCCCCC(C)CCCC519423
2-MethyltridecaneC14H30Methylalkane isomerCCCCCCCCCCCC(C)C15269
3-MethyltridecaneC14H30Methylalkane isomerCCCCCCCCCCC(C)CC110848
4-MethyltridecaneC14H30Methylalkane isomerCCCCCCCCCC(C)CCC117325
5-MethyltridecaneC14H30Methylalkane isomerCCCCCCCCC(C)CCCC520182
2-MethyltetradecaneC15H32Methylalkane isomerCCCCCCCCCCCCC(C)C15268
3-MethyltetradecaneC15H32Methylalkane isomerCCCCCCCCCCCC(C)CC86735
4-MethyltetradecaneC15H32Methylalkane isomerCCCCCCCCCCC(C)CCC520179
5-MethyltetradecaneC15H32Methylalkane isomerCCCCCCCCCC(C)CCCC98976
2-MethylpentadecaneC16H34Methylalkane isomerCCCCCCCCCCCCCC(C)C15267
3-MethylpentadecaneC16H34Methylalkane isomerCCCCCCCCCCCCC(C)CC17899
4-MethylpentadecaneC16H34Methylalkane isomerCCCCCCCCCCCC(C)CCC17751
5-MethylpentadecaneC16H34Methylalkane isomerCCCCCCCCCCC(C)CCCC32796
2,2-DimethylheptaneC9H20Dimethylalkane isomerCCCCCC(C)(C)C14062
2,3-DimethylheptaneC9H20Dimethylalkane isomerCCCCC(C)C(C)C26375
2,4-DimethylheptaneC9H20Dimethylalkane isomerCCCC(C)CC(C)C16656
2,5-DimethylheptaneC9H20Dimethylalkane isomerCCC(C)CCC(C)C16662
3,3-DimethylheptaneC9H20Dimethylalkane isomerCCCCC(C)(C)CC520991
3,4-DimethylheptaneC9H20Dimethylalkane isomerCCCC(C)C(C)CC13534
3,5-DimethylheptaneC9H20Dimethylalkane isomerCCC(C)CC(C)CC13558
4,4-DimethylheptaneC9H20Dimethylalkane isomerCCCC(C)(C)CCC136827
2,2-DimethyloctaneC10H22Dimethylalkane isomerCCCCCCC(C)(C)C85150
2,3-DimethyloctaneC10H22Dimethylalkane isomerCCCCCC(C)C(C)C23531
2,4-DimethyloctaneC10H22Dimethylalkane isomerCCCCC(C)CC(C)C92978
2,5-DimethyloctaneC10H22Dimethylalkane isomerCCCC(C)CCC(C)C139988
3,3-DimethyloctaneC10H22Dimethylalkane isomerCCCCCC(C)(C)CC138117
3,4-DimethyloctaneC10H22Dimethylalkane isomerCCCCC(C)C(C)CC85926
3,5-DimethyloctaneC10H22Dimethylalkane isomerCCCC(C)CC(C)CC139989
4,4-DimethyloctaneC10H22Dimethylalkane isomerCCCCC(C)(C)CCC85151
2,2-DimethylnonaneC11H24Dimethylalkane isomerCCCCCCCC(C)(C)C176691
2,3-DimethylnonaneC11H24Dimethylalkane isomerCCCCCCC(C)C(C)C520397
2,4-DimethylnonaneC11H24Dimethylalkane isomerCCCCCC(C)CC(C)C524749
2,5-DimethylnonaneC11H24Dimethylalkane isomerCCCCC(C)CCC(C)C28456
3,3-DimethylnonaneC11H24Dimethylalkane isomerCCCCCCC(C)(C)CC529413
3,4-DimethylnonaneC11H24Dimethylalkane isomerCCCCCC(C)C(C)CC13353494
3,5-DimethylnonaneC11H24Dimethylalkane isomerCCCCC(C)CC(C)CC20143700
4,4-DimethylnonaneC11H24Dimethylalkane isomerCCCCCC(C)(C)CCC53425988
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Methodology

The starter list covers low-carbon alkanes and named structural isomers. PubChem identifiers anchor each molecule, while RDKit or Open Babel can canonicalize larger generated isomer sets.

Expansion plan

Generate complete isomer sets by formula using cheminformatics enumeration, then validate names and identifiers against PubChem before publishing larger downloads.