More accurately known as 2,2-dimethylpropane, and sometimes neopentane, dimethylpropane is an isomer of C5H12. The two other isomers of this molecular formula are methylbutane and pentane.
        H
        |
    H---C---H
        |
    H   |   H
    |   |   |
H---C---C---C---H
    |   |   |
    H   |   H
        |
    H---C---H
        |
        H
Molecular weight: 72.151
Melting point: -16.6o C
Boiling point: 9.4o C
Other names: neopentane, 1,1,1-trimethylethane, tert-pentane, tetramethylcarbon, tetramethylmethane

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