I tried to estimate the heats of formation of cyclopropylated and cyclobutylated diazetidines
, but insufficient data lets cumulate many uncertainties.
- Dicyclobutyl was measured by Katorgyn, so 1,2-dicyclobutylcyclobutane is accessible.
- To 1,2-dicyclopropylcyclobutane, I applied the same +46.2kJ/mol as from methylcyclobutane to methylcyclopropane.
- From tertiary C-C to N-N, I applied +251.4kJ/mol because it's +175.1 from propane to Mmh, +200.0 from butane, +203.1 from isobutane.
- And I supposed that the ring strain acts on diazetidine as on cyclobutane.
N,N'-Dicyclopropyl-1,2-diazetidine is then 10s better than RG-1, as efficient as Mmh
. The Osiris applet doesn't consider it badly toxic, but that's only software. C+N=10 makes it flammable if lukewarm, similarly to turpentine.
Mixing some cyclobutylcyclopropyldiazetidine raises the flash point and depresses the melting point. Being 8s better than RG-1, it wastes little performance.
While matching the perfomance of Mmh would be an achievement, dicyclopropyldiazetidine can't replace it on existing rockets, as the mix ratios differ too much. The photocoupling synthesis I suggested on June 23, 2018 is hypothetic too.
Marc Schaefer, aka Enthalpy