A hydrocarbon chain or ring structure containing seven carbon atoms with methylene (-CH2-) groups.
From Greek 'hepta' (seven) + 'methylene' (a divalent hydrocarbon radical, from German 'Methylen'). Used in organic chemistry since the 1800s.
Heptamethylene is cycloheptane, a seven-membered carbon ring that's rigid and strained compared to six-membered rings—this molecular stress makes it chemically reactive and useful in synthesizing other compounds.
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