| butylene | <chemistry> Any one of three metameric hydrocarbons, C4H8, of the ethylene series. They are gaseous or easily liquefiable. Origin: From Butyl. Source: Websters Dictionary (01 Mar 1998) |
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| butylene glycols | 4-carbon straight chain aliphatic hydrocarbons substituted with two hydroxyl groups. The hydroxyl groups cannot be on the same carbon atom. (12 Dec 1998) |