but2eno

but2eno is a term that does not have a single, established meaning in major reference works. In many contexts it appears as a stylized or misspelled form of but-2-ene, an organic chemical compound, but there is no universally recognized entry for but2eno as an independent topic.

When interpreted as but-2-ene, the substance is an alkene with four carbon atoms and a carbon–carbon double bond between the second and third carbons. Its molecular formula is C4H8. But-2-ene exists as two stereoisomers, cis-2-butene and trans-2-butene, which differ in the arrangement around the double bond and in certain physical properties. These isomers are commonly discussed in the context of alkene reactivity, hydrogenation, and use as reference substrates in organic chemistry. But-2-ene serves as a basic example in teaching about unsaturation, isomerism, and reaction mechanisms.

If but2eno appears in digital content or databases, it may represent either a user handle, a project identifier, or simply a variation of the correct term but-2-ene. Absent additional context, it cannot be assigned a precise definition or significance. For clarity in scholarly writing, the correct form but-2-ene (or 2-butene when appropriate) should be used, and stereochemical designations (cis- or trans-) should be specified when relevant. The article remains a stub until a definitive, verifiable meaning for but2eno is established.