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Hemiacetal

Izvor: Wikipedija

Hemiacetal
Hemiketal

Hemiacetali i hemiketali su jedinjenja koja su izvedena iz aldehida i ketona respektivno. Grčka reč hèmi znači pola. Ta jedinjenja se formiraju formalnom adicijom alkohola na karbonilnu grupu.

Kad je alkoholna grupa zamenjena drugom alkoksi grupom, formiraju se acetal ili ketal, respektivno.

Formula i formiranje

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Gore: 1-etoksibutan-1-ol, hemiacetal. Dole: 1,1-dietoksibutan, acetal

Opšta formula hemiacetala R1R2C(OH)OR,[1] gde su R1 ili R2 često vodonik, dok R (vezana za O) nije vodonik.

Dok u IUPAC definiciji hemiacetalni R1 ili R2 mogu da budu vodonik, u hemiketalima ni jedna od R-grupa nije H. Hemiketali se smatraju hemiacetalima kod kojih R-grupe nisu H, tako da su potklasa hemiacetala.[2]

Formiranje hemiacetala

Formiranje hemiketala

Reference

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  1. Međunarodna unija za čistu i primenjenu hemiju. "hemiacetals". Kompendijum Hemijske Terminologije Internet edition.
  2. Međunarodna unija za čistu i primenjenu hemiju. "hemiketals". Kompendijum Hemijske Terminologije Internet edition.

Povezano

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Hemiacetal
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