2.1.4 Nomenclature (IUPAC Rules) a Systematic Name (IUPAC Rules (IUPAC: International Union of Pure and Applied Chemistry) a 1. Determine the number of carbon in the longest continuous carbon chain----This chain is called the parent hydrocarbon 12345678 CH3CH2CHCH2 CH2 CH2CH3 3-methyl Octane CH CH3CHCH2 CH2CH3 4-methyl Octane CH.CHOCHCH
2.1.4 Nomenclature (IUPAC Rules) ◼ Systematic Name (IUPAC Rules) ◼ (IUPAC: International Union of Pure and Applied Chemistry) ◼ 1. Determine the number of carbon in the longest continuous carbon chain----This chain is called the parent hydrocarbon. ◼ 1 2 3 4 5 6 7 8 ◼ CH3CH2CHCH2CH2CH2CH2CH3 3-methyl Octane ◼ CH3 ◼ CH3CHCH2CH2CH3 4-methyl Octane ◼ CH2CH2CH2CH3
2.1.4 Nomenclature (IUPAC Rules) 2. Number the chain so that the substituent gets the lowest possible number CH3CH2CHCH2 CHCH2 CH2CH3 5-ethyl-3-methyloctane CH3 CH2CH3 not 4-ethyl-6-methyloctane because 3<4 CHCH CH3CHCHCH2 CHCH3 3-ethyl-2, 6-dimethylheptane CH3 CH3 not 5-ethyl-2, 6-dimethylheptane because 3< 5
2.1.4 Nomenclature (IUPAC Rules) ◼ 2. Number the chain so that the substituent gets the lowest possible number. ◼ CH3CH2CHCH2CHCH2CH2CH3 5-ethyl-3-methyloctane ◼ CH3 CH2CH3 not 4-ethyl-6-methyloctane ◼ because 3 < 4 ◼ CH2CH3 ◼ CH3CHCHCH2CH2CHCH3 3-ethyl-2,6-dimethylheptane ◼ CH3 CH3 not 5-ethyl-2,6-dimethylheptane ◼ because 3 < 5
2.1.4 Nomenclature (IUPAC Rules) 3. Cite the name of the alkyl substituent before the parent hydrocarbon ----A number and a word are separated by a hyphen; numbers are separated by a comma. di, tri, tetra is used to express the number of the same substituents CH3CH2 CHCH2 CHCH3 2, 4-dimethylhexane CH. CH
2.1.4 Nomenclature (IUPAC Rules) ◼ 3. Cite the name of the alkyl substituent before the parent hydrocarbon. ---- A number and a word are separated by a hyphen; numbers are separated by a comma. di, tri, tetra is used to express the number of the same substituents ◼ CH3CH2CHCH2CHCH3 2,4-dimethylhexane ◼ CH3 CH3
2.1.4 Nomenclature (IUPAC Rules) And list substituents in alphabetical order. di, tri, tetra, sec, and tert are ignored in alphabetizing. iSO, neo, and cyclo' are not ignored in alphabetizing 3HC2HC CH CH3CH2CCH2CH2CHCHCH2 CH2CH3 3, 3, 6-triethyl-7-methyldecane 3HC2HC CH2CH3 CH3 CH3CH2CH2CHCH2 CH2 CHCH3 5-isopropyl-2-methyloctane CH(CH3)2
2.1.4 Nomenclature (IUPAC Rules) ◼ And list substituents in alphabetical order. ---- “di, tri, tetra, sec, and tert” are ignored in alphabetizing. “iso, neo, and cyclo” are not ignored in alphabetizing. ◼ 3HC2HC CH3 ◼ CH3CH2CCH2CH2CHCHCH2CH2CH3 3,3,6-triethyl-7-methyldecane ◼ 3HC2HC CH2CH3 ◼ CH3 ◼ CH3CH2CH2CHCH2CH2CHCH3 5-isopropyl-2-methyloctane ◼ CH(CH3 )2
2.1.4 Nomenclature (IUPAC Rules) 4. f the same substituent number are obtained in both directions the first cited group received the lower number CH 3-ethyl-5-methylheptane CH3CH2CHCH2CHCH2 CH3 not CH2CH3 5-ethyl-3-methylheptane 2-bromo-3-chlorobutane CH3CHCHCH3 not Br 3-bromo-2-chlorobutane
2.1.4 Nomenclature (IUPAC Rules) ◼ 4. If the same substituent number are obtained in both directions, the first cited group received the lower number. ◼ CH3 3-ethyl-5-methylheptane ◼ CH3CH2CHCH2CHCH2CH3 not ◼ CH2CH3 5-ethyl-3-methylheptane ◼ Cl 2-bromo-3-chlorobutane ◼ CH3CHCHCH3 not ◼ Br 3-bromo-2-chlorobutane