CHAPTER 11. ALKENES
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Carbocation
StabilitCH3(+) <CH3CH2(+)< (CH3)2C)< (CH3)3C(+)
GEOMETRICAL ISOMERS
1. Alkyl carbocation
Primary carbocation: R-CH2+
Secondary carbocation(R)2CH+
Tertiary carbocation: (R)3C+
Secondary carbocation(R)2CH+
Tertiary carbocation: (R)3C+
StabilitCH3(+) <CH3CH2(+)< (CH3)2C)< (CH3)3C(+)
GEOMETRICAL ISOMERS
The essential requirement for this stereoisomerism is that each carbon of the double bond must have two different substituent groups (one may be hydrogen).
1. Alkyl carbocation
Primary carbocation: R-CH2+
Secondary carbocation(R)2CH+
Tertiary carbocation: (R)3C+
Secondary carbocation(R)2CH+
Tertiary carbocation: (R)3C+
| Carbocation Stability | CH3(+) | < | CH3CH2(+) | < | (CH3)2C) | < | (CH3)3C(+) |
|---|
http://www.chemguide.co.uk/organicprops/alkenes/background.html
http://chemwiki.ucdavis.edu/Organic_Chemistry/Hydrocarbons/Alkenes
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