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

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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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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.