I'm looking for input from chemists, biochemists, and those familiar with rocket fuel propellants. I'm a fantasy world builder, but that doesn't mean everything in my fantasy world is excluded from scientific rigor (magic systems excluded, of course). I've been pondering the physiology of the dragons in one of my worlds, and would like to use hypergolic compounds to produce dragon fire. Hypergolic compounds are commonly thought of as propellants or rocket fuel. They are compounds that, when mixed with an oxidizing compound, ignite instantly. My fault is that these compounds are produced in a glandular system, conveyed by ducks to vents either under or on the dragons tongue, or located in the jaw structure at the forward end of the snout.
Hypergolic compounds are highly caustic and/or toxic to humans, but I see no reason why dragons could not have developed with the ability to create store and process such materials. I'd like to know if any of the known or theorized hypergolic combinations has greater viscosity than others. My research has indicated that some combinations produce more caloric energy than others, including the ability of some to melt stone and gravel. That seems to be the level of heat that would be about right for dragon fire, in my opinion.
From a biochemical standpoint, what types of organic compounds, rocks, or minerals would my dragons need to consume in order for their bodies to synthesize a hypergol and oxidizer?
I'd appreciate any and all feedback you can provide.