Organic Chemistry 2230; Chapter 5 Part B Notes
Organic Chemistry 2230; Chapter 5 Part B Notes Chemistry 2230
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This 2 page Class Notes was uploaded by Amanda Biddlecome on Thursday February 25, 2016. The Class Notes belongs to Chemistry 2230 at Clemson University taught by Dr. Schroeder in Fall 2016. Since its upload, it has received 20 views.
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Date Created: 02/25/16
Organic Chemistry 2230 Chapter 5: Alkenes, Part B February 22, 2016 Amanda Biddlecome 1) Nomenclature -‐all previous naming rules still apply -‐parent ends in the suffix –ene -‐alkene is higher priority than halides -‐alcohol still has to be part of the parent -‐if alkene is going to be the parent, the double bonded carbons have to be in the longest carbon chain -‐if multiple double bonds are present, put the prefix (di, tri, etc.) before the – ene but after the parent name prefix -‐alcohol takes priority of alkenes -‐when finding the spin, a double bond takes priority over single bonds because with double bonds, you have one carbon bonded to another carbon twice -‐vinyl carbons are sp carbons 2 *bonded to the parent chain and then double bonded to something else *functional group -‐allyl carbons *sp carbon bonded to a vinyl group *not part of the parent chain -‐cis,trans *cis=two methyl groups on the same side as double bonds *trans=two methyl groups on different sides *old system *diastereomers *cis=more polar with a higher boiling point *arrangement=important *can only use this when you’re talking about two groups -‐E,Z Naming System *4 different things on double bonded carbons *prioritize left and right by atomic size *E=higher priorities are opposite (one on top, one on bottom) *Z=higher priorities are together (both top or both bottom) *only for alkenes *only for internal double bonds *don’t worry about E and Z in rings *if there’s two double bonds in one parent, find E or Z individually for each and then write both in front of the name (Example: (1E,2E)) -‐Stability *the more R groups attached to them, the more stable it is: low potential energy and isn’t very reactive (more substituted) *trans is more stable than cis 2) Alkynes -‐single bonds end in –ane -‐double bonds end in –ene -‐triple bonds (alkynes) end in –yne *terminal alkynes: when you have four carbons, the terminal one is attached to the last carbon on either side of the chain *internal alkynes: when you have four carbons, the terminal alkyne is attached to the middle carbons *there are no E or Z alkynes -‐Nomenclature *carbon with a triple bond=sp hybrid;180 degrees; sigma bonds, pi bonds; more acidic because more electronegative than alkanes and alkenes *Systematic: easiest, meth….prefixes (ethyne, propyne, 1-‐butyne) *Common: very complicated; based off of acetylene unit *can use them as parents *triple bond attached to something else but not the parent=ethynyl *triple bond attached to a carbon that’s attached to something else=propargyl
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