09162009 - 2 In a branched alkane some of the C atoms are...

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CH 310M/318M – MWF 12:00 – Lecture 9 – W 9/16/2009 Reading Assignment : No new reading… Graded Homework : HW#04 deadline = 3:00 p.m. TODAY HW#05 deadline = 3:00 p.m. on Thu 9/17 HW#06 deadline = 3:00 p.m. on Mon 9/21 Last Time : Functional groups (continued…) Alkanes – line-angle structures and degree of substitution Textbook Problems : 2.3, 2.26(a-d), 2.27(a-f), 2.28(a-f) Today : Constitutional isomers Nomenclature of acyclic alkanes Students who submitted a conflict exam request form should have received e-mail indicating the status of their request. If you turned in a form BEFORE FRIDAY’S DEADLINE and you have not received this message, please let me know ASAP!!! It is no longer possible to sign up to take any of the conflict exams!!!
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Know the names of the unbranched alkanes having 1 through 12 C atoms!!!
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Rules for Naming Alkanes (Be sure to look at the online handout!!!) 1) Unbranched alkanes are named according to the number of C atoms (Table 2.1)
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Unformatted text preview: 2) In a branched alkane, some of the C atoms are not part of the longest continuous chain (the parent chain). Identify the parent chain. Tip : Start at any end of a chain. Trace along with your finger until you reach another end. Try all possibilities. The path which incorporates the most C atoms without lifting your finger is the parent chain. 3) If two or more chains within a structure have the same length, the parent chain is the one that contains more branches. 4) Number the parent chain from one end to the other in the direction that gives the lower possible number to the first branch. If there is more than one substituent, the alternative numbering schemes are compared number by number. The scheme which gives the lower number at the first point of difference is correct. 5) Name each substituent group, and identify the number of the parent chain C atom to which it is attached....
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