Spontaneous Decomposition of 1,3-Cyclohexadiene: Curiosity or Reality?

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Discussion Overview

The discussion centers on the potential spontaneous decomposition of 1,3-Cyclohexadiene into benzene and hydrogen gas, exploring the conditions under which this might occur, particularly at standard temperature and pressure (STP).

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant questions whether 1,3-Cyclohexadiene would spontaneously decompose into benzene and hydrogen gas.
  • Another participant asks for the specific temperature and pressure conditions for the reaction.
  • A subsequent reply specifies the conditions as 273 K and 1 atm.
  • One participant asserts that 1,3-Cyclohexadiene does not decompose spontaneously, citing the presence of a transition-state barrier and the need for activation energy for the reaction to occur.
  • A participant mentions the commercial availability of 1,3-Cyclohexadiene, providing pricing information.
  • Another participant expresses appreciation for the insights shared, indicating a learning experience regarding organic chemistry.

Areas of Agreement / Disagreement

There is no consensus on whether 1,3-Cyclohexadiene can spontaneously decompose, as one participant claims it does not, while others have not provided counterarguments or support for this claim.

Contextual Notes

The discussion does not clarify the specific conditions under which the decomposition might be considered, nor does it address the detailed mechanisms involved in the reaction.

Char. Limit
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I was wondering if 1,3-Cyclohexadiene would spontaneously decompose into the more stable benzene + hydrogen gas. Would it?
 
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At what temperature/pressure?
 
Oops, sorry about that. I'm too used to assuming STP.

273 K and 1 atm.
 
It doesn't, no.

To answer the question more generally, the reason why things don't spontaneously combust is that you've got an transition-state barrier. You need an 'activation energy' for the reaction to happen.
 
Aldrich sells 1,3-cyclohexadiene for $45.60 per 5 mL, $534.00 for the economy-sized 100 mL vial...
 
Ah, I see.

Thank you for expanding my homegrown knowledge of organic chemistry.
 

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