Pentaborane, a colorless, pyrophoric, low-boiling liquid with a disagreeable odor, was first synthesized from B2H6 in the 1930s by H. I. Schlesinger and A. B. Burg. In the 1950s, it was considered as a rocket fuel by the United States and the Soviet Union. Pentaborane and its boron hydride cousins were the subject of The Green Flame: Surviving Government Secrecy, a 1991 memoir by Andrew Dequasie.
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