"I was told one of the boranes were 2,000 times more deadly than HCN. Diborane"
I assume you mean 2000x more toxic? if so, you're way off. Boranes aren't toxic - just flammable / pyrophoric with a tendency to form unstable explosive impurities.
"Why haven't they assuming it's not classified? "
from the materials the Russian had available I think they probably tried it, but my guess is they didn't have the technical expertise to scale it up. Both handling the borane, and large scale production of the synthetic hydrocarbon was probably beyond their materials handling skills.
As to the USA -sorry, don't know: its a technology the guys at Callery don't like talking about, even now. However the synthetic hydrocarbon manufacturing technology would have been available: that was all sorted during WWII by Henry Channon in his researches into synthetic fuels. But maybe they simply found that the synthetic fuels were good enough without needing the borane
Last edited by jamesdevice; 20th Sep 2011 at 17:43.