UT Arlington CHEM 2321 - Chap.8 notes (15 pages)

Previewing pages 1, 2, 3, 4, 5 of 15 page document View the full content.
View Full Document

Chap.8 notes



Previewing pages 1, 2, 3, 4, 5 of actual document.

View the full content.
View Full Document
View Full Document

Chap.8 notes

65 views


Pages:
15
School:
University of Texas at Arlington
Course:
Chem 2321 - Organic Chemistry
Organic Chemistry Documents

Unformatted text preview:

Chap 8 notes Introduction to elimination reactions Elimination when a proton from the beta position is removed together with the leaving groups forming a double bond this is called a beta elimination or 1 2 elimination Dehydrohalogenation name of the process that involves a halide as a leaving group Dehydration when the leaving group is water Alkenes Are usually the end products of an elimination process Alkenes possess double bonds Nomenclature of Alkenes 1 2 3 4 Identify the parent is the longest chain that includes the Identify the substituents Assign a locant to each substituent Arrange the substituents alphabetically When naming the parent replace the suffix ane with ene Example bonds Pentane pentene When numbering the parent chain the double bonds must have the lowest numbers in other words start numbering form the double bonds Example 4 ethyl 3 isopropyl 2 5 dimethyl 2 heptene Number associated with substituents Number associated with the position of the double bond hept 2 ene Common names Ethylene Propylene Styrene Vinyl Allyl Phenyl Methylene Alkenes are also classified by their degree of substitution Substitution refers to the number of alkyl groups connected to a double bond A double bond is comprised of a sigma bond and a pi bond Using cis and trans designations Cycloalkenes comprised of fewer than seven carbon atoms cannot accommodate trans pi bonds rather cis pi bonds There is no need to identify the stereoisomerism of the double bond when naming each of these compounds because the stereoisomerism is inferred For example there is no need to call cyclohexene as cis cyclohexene it is understood An 8 membered ring is the smallest ring to ever contain a trans double bond and be stable at room temperature Bredt s Rule it is not possible for a bridgehead carbon of a bicyclic system to possess a double bond if it involves a trans pi bond being incorporated in a small ring Using E and Z designations Recall Cahn ingold prelog naming 1 Evaluate each carbon



View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Chap.8 notes and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Chap.8 notes and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?