How to Solve a Complex Multi-Step Organic Chemistry Problem?

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Discussion Overview

The discussion revolves around solving a complex multi-step organic chemistry problem involving the conversion of a primary alcohol to a terminal alkyne. Participants explore various reaction pathways and methodologies relevant to organic synthesis.

Discussion Character

  • Homework-related, Exploratory, Technical explanation

Main Points Raised

  • One participant presents a multi-step reaction starting from butanol to produce a terminal alkyne, seeking guidance on how to approach the problem.
  • Another participant suggests beginning with known reactions that produce terminal alkynes, implying that the solution may be simpler than it appears.
  • A participant proposes hydration-electrophilic addition as a potential step, but expresses uncertainty about its applicability in this context.
  • Another participant advises to consider the reverse reaction first, hinting at a different approach to the problem.
  • A later reply outlines a specific reaction sequence involving BH3 and H2O2, leading to the formation of an alkene before converting it to an alkyne.
  • One participant questions the validity of the last step in the proposed sequence and expresses skepticism about the complexity of the first step suggested by others.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the best approach to solve the problem, with multiple competing views and uncertainties regarding the proposed reaction steps.

Contextual Notes

Some participants express uncertainty about specific reaction mechanisms and the appropriateness of certain reagents, indicating potential limitations in their understanding or assumptions about the reactions involved.

nydream12
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Multi-step Organice problem!

Hello, I have a multi-step problem that I can't even begin to solve. I would be really helpful if anyone showed me a way to solve this problem. Thank you. Have a pleasant great day.

Multi-step example:

CH3CH2CH2CH2OH ----> CH3CH2C≡CH
 
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What reactions do you know of that produce (terminal) alkynes? That is where you need to start.
You are going to kick yourself when you see how easy this problem is.
 
Would it be Hydration-electrophilic addition of water (1. H20, 2. H2SO4 & HgSO4)? If yes, I don't see how.
 
Go the other way first...
 
CH3CH2CH2CH2OH 1.BH3 2. H2O2,HO > CH3CH2CH=CH2 H2 > CH3CH2C(triple bond)CH.
 
I'm not sure about that last step. And where did you find that first step? Seems pretty exotic where a much simpler reaction would do.
 

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