Quick Elimination question

[thedarkhorse]

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i attached a reaction. but i don't understand why it is an E1 elimination

 

[Jackson-Ave-Dental]

The main reason being that there is HEAT involved.

A very good general rule to follow is... when there is heat there will usually be an elimination.

**Also a 'reflux' is equivalent to being heated too 🙂

 

[thedarkhorse]

The main reason being that there is HEAT involved.

A very good general rule to follow is... when there is heat there will usually be an elimination.

**Also a 'reflux' is equivalent to being heated too 🙂

thanks thats great to know. also great scores btw 🙂

 

[vindicated]

thanks thats great to know. also great scores btw 🙂

most reaction with heat will be E2 exception is dehydration (heat and h2so4 which is E1).

 

[TwentyTwelve]

what everyone else said above plus:

E1 is a uni-molecular reaction. This means that the reaction occurs in two steps...the first is the formation of a carbocation after the alcohol is protenated by the acid and leaves. Any time a carbocation is formed the reaction is SN1/E1. However, we can determine the reaction goes E1 because the acid catalyzes the dehydration of the molecule (hence the leaving of the water --> dehydration) and forms an alkene. Hope this helps!!