<p>087a1ac7b86cb348a00e0438a5e3d863.doc SCH4C – Organic Chemistry</p><p>Date: ______Alkenes</p><p>Alkenes are a variation on Alkanes Contain at least one ______Recall that double bonds share ______of ______Represented by two lines</p><p>Naming Alkenes Use IUPAC System Find the longest continuous chain of ______atoms and use that as the base name Use the same base names as for alkanes Change the end to “______”</p><p>In most cases, we need to know where the double bond occurs We can have two or more ______that have the same number of carbons and hydrogens, but a different structure These are called ______</p><p>Page 1 of 5 087a1ac7b86cb348a00e0438a5e3d863.doc SCH4C – Organic Chemistry</p><p>These two isomers have different ______and ______properties It is important to differentiate these two We need to note where the ______is Count from the end Use the one that has the ______</p><p>Drawing Alkenes Same as the alkanes for structural drawings Use extra line to show the place of the double bond Examples</p><p>4-decene</p><p>Page 2 of 5 087a1ac7b86cb348a00e0438a5e3d863.doc SCH4C – Organic Chemistry cis and trans Alkenes There are two forms of alkenes Depends on the ______of the double bond If the larger groups are on the same side of the double bond, it is ______If the larger groups are on the opposite side of the double bond, it is ______Examples:</p><p>Page 3 of 5 087a1ac7b86cb348a00e0438a5e3d863.doc SCH4C – Organic Chemistry</p><p>Cyclic Alkenes</p><p>With a cyclic alkene, we can chose the starting carbon So we know that the double bond is at position 1</p><p>Page 4 of 5 087a1ac7b86cb348a00e0438a5e3d863.doc SCH4C – Organic Chemistry</p><p>Draw structures for the following compounds.</p><p>1.cis-4-ethyl-2-heptene</p><p>2.2-methyl-2-butene</p><p>3.2,4,6-octatriene</p><p>4.3,4-dimethyl-2-pentene</p><p>5.5-ethyl-3,6-dimethyl-1,7-nonadiene</p><p>6.2-methylpropene</p><p>7.7-propyl-3-decene</p><p>8.5-ethyl-3-heptene</p><p>9.5,6-dipropyl-2-nonene</p><p>10. trans-3-hexene</p><p>Name the following structures.</p><p>1. 5. CH2 CH2CH2CH3 || | CH3-CH2-C-CH2-CH2CH3 CH3CH=CHCH2CH2CHCH3</p><p>2. 6.</p><p>CH3CH=CHCH-CH3 CH3CH2CH2CH2CH2CH=CHCH2CH2CH3 | CH3</p><p>3. 7. CH3 CH3 | | CH3CH2CH2C=CH3 CH3CHCH2C=CHCH3 | CH2CH3</p><p>4. 8. CH2CH3 CH3 CH2CH3 | | | CH3CHCHCH=CH2 CH3CHCHCH=C | | | CH2CH3 CH3 CH3</p><p>Page 5 of 5</p>