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Organic Chemistry

Scorching goIITian

Joined:	23 Oct 2007
Post:	279

28 Oct 2007 19:35:57 IST

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598

alkene-2

None

What product will predominate on the addition of 1 mole of 1,3penta-diene of:-

a)1 mole of Bromine

b)2 mole of Bromine

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arun-rashi

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Joined: 19 Oct 2006

Posts: 1057

28 Oct 2007 22:03:51 IST

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this is 1,3 pentadiene which is conjugated diene shows resonance .if we add bromine at low temperature at 0 degree it form 1,2 -position addition while at high temperature at 40 -80 degree range it form 1,4 addition product as major.this is explain by competition between chemical kinetics and thermodynamical control reaction.normally at low temperature kinetically control product is major while at high temprature thermodynimacally product is major.

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