3D-Circle/CHEMaths

Alkane isomer numbers inaccurate

Closed this issue · 3 comments

Pyxidatol-C commented

The number of structural isomers of alkanes are only accurate up to 6:

  • Heptane is said to have 7 structural isomers, while according to wikipedia

Heptane has nine isomers

  • Octane is said to have 11 isomers, while

Octane has 18 structural isomers

Pyxidatol-C commented

In the case of heptane,
only one of

C - C - C - C - C - C
    |
    C

C - C - C - C - C - C
        |
        C

is considered;
only one of

C - C - C - C - C - C
    |
    C
    |
    C

C - C - C - C - C - C
        |
        C
        |
        C

is considered.

These result in the 2 unaccounted structural isomers.

TrakJohnson commented

Useful link: http://oeis.org/A000602 (series we are trying to find, probably better off parsing them off wiki 😈 )

Pyxidatol-C commented

no one cares anyways 😈