nucleophilic substitution of secondary haloalkane

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sumayaaa
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i do A level OCR A chem

i know nucleophilic substitution of primary haloalkanes have one step, and tertiary haloalkanes have two steps.

How many steps of nucleophilic substitution would secondary haloalkanes have? I don't think we need to know it since its not on the spec but Im just asking out of curiosity and clarification.
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casualchemistry
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Well, the main issue is that secondary haloalkanes aren't so easy - so often it's best to plan not to use them in your synthetic planning.

Both forming a carbocation first (known as SN1) is slow as the carbocation isn't very stable and just direct attack of a nucleophile (known as SN2) is slow as the carbon centre is a bit hindered.

The main issue is that because both of these substitution reactions are unfavourable to some extent, you probably get a bit of both happening at all times. But also, elimination reactions to form alkene (by E1 or E2 reactions) also become pretty likely as competing reactions for what you want.
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charco
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(Original post by sumayaaa)
i do A level OCR A chem

i know nucleophilic substitution of primary haloalkanes have one step, and tertiary haloalkanes have two steps.

How many steps of nucleophilic substitution would secondary haloalkanes have? I don't think we need to know it since its not on the spec but Im just asking out of curiosity and clarification.
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sumayaaa
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thanks for all the help!
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Pigster
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(Original post by sumayaaa)
i do A level OCR A chem

I don't think we need to know it since its not on the spec
I will confirm: you DO NOT need to know about SN1 reactions, or elimination from haloalkanes.
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sumayaaa
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(Original post by Pigster)
I will confirm: you DO NOT need to know about SN1 reactions, or elimination from haloalkanes.
thank you thank you!
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