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CH 220 1st Edition Lecture 7 Outline of Current Lecture I. Alkenes II. Naming alkenes III. Naming cycloalkenes IV. Common names V. Cis-Trans isomerism in Alkenes VI. E,Z system Current Lecture I. Alkenes a. Any hydrocarbon that contains a carbon-carbon double bond is an alkene b. Many naturally occurring materials are classified as alkenes i. Ethylene ii. alpha-Pinene – the fragrance of pine, pine-sol iii. beta-Carotene – orange pigment and vitamin A precursor c. Common in industrial preparation i. Many products are composed of ethene 1. Polyethylene – common plastic 2. Vinyl chloride – pvc pipe ii. Propene 1. Polypropylene – carpet fibers II. Naming alkenes a. Name the parent hydrocarbon i. Must include the double bond in the parent, it cannot be in a substituent b. Number the carbons in the chain – making sure that the double bond gets the lowest number possible (it takes precedence over all substituent numbering) c. Write the full name, numbering substituents accordingly i. Position in chain ii. Alphabetically 2-hexene 2-methyl-3-hexene III. Naming cycloalkenes These 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.

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