Could the Kharasch addition make intermediates to cyclopropanes, azetidines, dihydroazetes
? It puts halogens at proper distance.
Kharasch to 1,3-dihalopropane can have some merit. Then, cyclopropane and azetidine (picture) follow usual paths. R≠H improves the yield and can be removed later. R=cPr makes an efficient but volatile fuel.
Kharasch to (methyl)allyl chloride is less direct than usual routes. I see no merit for cyclopropene nor methylcyclopropene synthesis. No picture.
The scheme to dihydroazete (picture) obtains a halogen next to the amine. HX elimination is easier here than with a chloramine which might also create nasty compounds. I drew NH3
, but a primary amine raises the yied from poor to excellent with dihalopropane, so some rest should be present and removed. The 2-haloazetidine may have more uses.
When some compounds can run away thermally, the reactor must try to prevent
it by design. Here ethylene may polymerize for instance.
I hope the thermal inertia of a material in close contact with said compound stabilizes it over a time scale range. A sturdy construction would resemble the catalyst I described there scienceforums
using a honeycomb winding of wire(s) sintered together
and the flow outwards. The wires can have varied diameters and carry an inhibitor for the unwanted reaction. They can also carry a catalyst for the desired reaction. Or both, spread over the thickness or as a sandwich, for instance inhibitor - catalyst - inhibitor.
If the reactor needs pressure (apparently Kharasch doesn't usually), the unwanted reaction possibly happens already at the compressor. A Tesla compressor
, which stacks many fine smooth spinning disks, would group both functions at one place for added safety. Expansion could happen in a Tesla turbine wikipedia
Marc Schaefer, aka Enthalpy