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Why is Isoprene iso? Isoprene not have its central atom cleaved a hydrogen bond.

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sd79812:



I don't even know what the central atom of a isoprene is. Does the rule above work when you don't have an odd number of carbons on the longest not necessarily straight backbone?

Hunter2:
Isoprene is a trivial name for 2-Methyl-1,3-butadiene, i think it has nothing to do with the Iso  like in Iso-propyl. There  is no n-prene vise versa isoprene, like in Isopropyl to n-Propyl or n- Butane and Isobutane (2-Methylpropane).

sd79812:
hexaprene, heptaprene exist but butaprene,ethylprene don't exist on google.com

Hunter2:
And?

These are also trivial names.
Please check the IUPAC names for them.

There are also others like Neoprene, Chloroprene, Newprene, Hiprene, Terraprene,etc.

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