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Neopentane, also called dimethylpropane or 2,2-dimethylpropane, is a double-branched-chain alkane with five carbon atoms. Neopentane is an extremely flammable gas at room temperature and pressure which can condense into a highly volatile liquid on a cold day, in an ice bath, or when compressed to a higher pressure.
IUPAC nomenclature retains the trivial name neopentane. Dimethylpropane is the systematic name. The respective substituent numbers (the 2,2-) are unnecessary because there can be no isomers of this molecule with dimethylpropane as part of their names.
A neopentyl substituent or a neopentyl compound has the structure Me3C-CH2- for instance neopentyl alcohol.
Proton NMR spectrum
Neopentane has Td symmetry. As a result, all protons are chemically equivalent leading to a single chemical shift at δ 0.902 in carbon tetrachloride. This is similar to the silane analog, tetramethylsilane which has a single chemical shift, defined as δ 0 by convention.
Chirally deuterated neopentane ([2H1,2H2,2H3]-neopentane) is an interesting molecule. The neopentane is rendered chiral by the isotopic substitution of hydrogen . Its chirality arises solely by the mass distribution of its nuclei, while its electron distribution is completely achiral.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Neopentane". A list of authors is available in Wikipedia.|