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The structure of spiropentadiene
The structure of spiropentadiene is shown below; it undergoes a Diels-Alder reaction with two molar equivalents of 1,3-cyclopentadiene. Spiropentadiene is unstable because of its great ring strain. Although cyclopropane rings are retained in the product, they have less ring strain than cyclopropene rings.
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styx code of B4H10
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