Post by: Enthalpy on January 11, 2013, 11:10:20 AM
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!
Post by: Dan on January 11, 2013, 11:42:37 AM
It exists - example (http://www.sciencedirect.com/science/article/pii/S0040403907020606).
Post by: Enthalpy on January 11, 2013, 12:01:28 PM
Post by: Borek on January 11, 2013, 12:15:21 PM
Not bad, but a little bit too flat.