CHEM 212 Lecture Notes - Lecture 5: Alkene, Substituent, Stage Name
27 Feb 2019
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We want o make the most substiyutedand trans alkene. E1 undergoes rearrangement after the lg falls off (just like sn1) given that its not a stable carbocation initially. E2:more than 1 h results in more than 1 possibility(for linear molecules): E2: for rings check both sides for anti-conformation as we can"t rotate(that means bond breaking) note: for sn2 and rings its better to start with a trans ch and lg. In e1 we don"t really need anti coplanar conformation. Once the carbocation has been removed we just need to make sure that the h is coplanar with the p orbital of the carbocation (just so the double bond can be easily formed. This will result in different conformations given that the substituent groups are not identical. Alykyne, alkene halogens are not good for e reactions. E1: carbocation is formed so to make sure it is stable so something with tertiary and/or resonance good.
