[Enthalpy]

Hello nice poeple!

I couldn't find anywhere data about spiro[3.3]heptane, or C1CCC12CCC2, like its density, melting point, boiling point (except estimated data of course...).

Since data exists for spiropentane, spiro[2.3]hexane, spiro[4.4]nonane, I had supposed that spiro[3.3]heptane exists, but at least a book from 1948 tells not and a paper from 1976 tell "strain is not know" which implies no significant amount has been synthesized.

Derivates are well-known, like bicarboxylic, and even the more energetic aza and diaza variants that ease ring closure.

So: does spiroheptane exist? Have you seen some evidence? Thank you!

[Dan]

What databases are you searching?

It exists - example.

[Enthalpy]

Thank you!

[Borek]

Not bad, but a little bit too flat.