CH 221 1st Edition Lecture 7 Outline of Last Lecture I. Last of Acids and BasesII. Organic NomenclatureIII. Homologous structuresIV. Constitutional IsomersV. Alkyl SubstituentsOutline of Current Lecture VI. Alkanes Systematic NomenclatureVII. Common vs. Systematic Nomenclature VIII. Substituents in OrderIX. Multiple SubstituentsX. Branched SubstituentsCurrent LectureVI. First identify the longest continuous chain also known as the parent hydrocarbon. Always identify the parent hydrocarbon then number accordingly. Add the name of the substituent then number the chain in the direction that gives the substituent as low a number as possible. Ex. 2-methylpentane not 4-methylpentaneVII. Common vs Systematic nomenclature simply means some compounds are better known by easier to say names than their systematic name may be.Ex. Common name: isohexane Systematic name: 2-methylpentaneThe common name never contains numbers while the systematic names can have numbers.VIII. Substituents are listed in the compound’s name in alphabetical order. The correct name is the one that contains the least amount of numbers.Ex. 5-ethyl-3-methyloctane because E comes before MThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.IX. When you have multiple substituents the numbers are separated by a comma and a number and a word are separated by a hyphen. The chain is numbered in the direction that puts the lowest number in the name. Substituents are listed in alphabetical order (di- and tri- are not alphabetical). Ex. 5-ethyl-2,5-dimethylheptane because di- does not count toward the alphabetical listingX. When two or more chains have the same length, the parent hydrocarbon is the chain with the most substituents. Ex. 4-(1-methylethyl)
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