Should I write my will now? Going to use 1.5 moles of t-buLi tomorrow.

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Discussion Overview

The discussion revolves around the safe handling and transfer of t-butyllithium (t-buLi) in a laboratory setting, particularly focusing on the risks associated with its use and the methods for transferring it effectively. The context includes practical advice and personal experiences related to chemical reactions involving t-buLi and ether as a solvent.

Discussion Character

  • Technical explanation
  • Experimental/applied
  • Debate/contested

Main Points Raised

  • One participant notes that t-buLi can become highly reactive and potentially dangerous if mishandled, particularly when expelled from a syringe.
  • Another participant emphasizes the importance of not working alone during the reaction and suggests having a fire extinguisher readily available.
  • There is a discussion about the method of transferring t-buLi using a cannula to minimize exposure to air, with one participant offering to share techniques if needed.
  • A personal account is shared where a participant experienced a fire due to a loose stopcock during the addition of t-buLi, highlighting the risks involved.
  • Concerns are raised about using a Teflon stopcock for air-sensitive reactions, with a suggestion to use a ground glass stopcock instead, as Teflon may react with aggressive bases.

Areas of Agreement / Disagreement

Participants express a consensus on the dangers of using t-buLi and the need for safety precautions. However, there are differing opinions on the best materials and methods for transferring the chemical, indicating that multiple views remain on the safest practices.

Contextual Notes

Participants mention specific experiences and preferences regarding equipment, but there is no consensus on the best practices for all scenarios. The discussion reflects a range of personal experiences and safety considerations without resolving the best approach.

gravenewworld
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And the solvent for the reaction is going to be 2.5 liters of ether. :bugeye:


I hear the t-buLi becomes an instant flame thrower if it is shot out of a syringe.

Seriously though, anyone else use this stuff before?
 
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I've used it on a smaller scale. It's a doozie! Don't work alone during the addition or manipulation phase of the reaction. Have your fire extinguisher handy as well.
Are you going to transfer by cannula from the stock bottle to your dropping funnel or reaction vessel? There is a way to minimize the needle's exposure to the air. Let me know if you don't know of a method.
 
chemisttree said:
I've used it on a smaller scale. It's a doozie! Don't work alone during the addition or manipulation phase of the reaction. Have your fire extinguisher handy as well.
Are you going to transfer by cannula from the stock bottle to your dropping funnel or reaction vessel? There is a way to minimize the needle's exposure to the air. Let me know if you don't know of a method.

Yeah we used a cannula to transfer 800 mL of 1.7 M t-butylli solution to an addition funnel. Everything was going fine until I started to try to drip in the t-butyli. Apparently the stopcock wasn't tightened extremely well and flames started coming out of it. We got lucky because a spark just missed our acetone/dry ice bath by like an inch (and there were probably 3 L of acetone in the bath). The fire stopped quickly though and it pretty much sealed itself.
 
You were using a teflon stopcock? That's pretty risky. I would use a ground glass stopcock with greased joints for any really air sensitive stuff. I've also noticed that aggressive bases react with teflon a bit turning them slightly brown. That can't be good. If you did have a fire, teflon melts! Big effects follow...
 

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