Competing reactions

• Formation of most highly substituteddouble bond predominates since this is more stable

• Zaitsez's rule also applies

56

• In the E1 reaction, stability of the carbocation important:

CH3CH2OH needs conc H2SO4 at 170ƒ

(CH3)2CHOH needs 50% H2SO4at 100ƒ

(CH3)3COH needs 33% H2SO4 at 50ƒ

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