IUPAC NOMENCLATURE General formula of nomenclature Er. Vishwa Vivek Sharma Chemical Engineer)
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IUPAC- International Union Of Pure And Applied Chemistry IUPAC rules were first laid down in 1892. The system of nomenclature, based upon IUPAC rules is known as IUPAC system of nomenclature or systematic nomenclature
HOW? Formula for nomenclature: 2* prefix +1* prefix + word root +1* suffix + 2* suffix
Word root:- a word root indicates the nature of the basic carbon skeleton. Chain containing one to four carbon atoms are known by special word root, while chain from C5 onwards are known by Greek numerals Word root Non adec- Icos- Henicos- Docos- Tricos- Nonacos_ Triacont Hentriacont Dotriacont- Tetracont- Pentacont- Chain length Word root Meth Eth- Prop But- Pent- Hex- Hept- Oct- Non- or Ennea Chain length 19 21 31 10 Undec- or Hendec- Dodec Tridec- Hect- 100 12 13
Examples CH^CH2CH2CH2CH2CH3 n Hexane, (I) n-Hexane, (I) Octane 2-Methylheptane
CH3 CHgC CH terl-Butyl CH3 CH CH CH.CE,CH2CH- CHCHCH CH,CH 2 -Butyl iso-butyl sec-Butyl
Practice Question Identify the no. of carbon in main skeleton?
Vishwa Vivek Sharma
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