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Until recently, the use of high temperatures (>1000°) has held few attractions for the majority of synthetic chemists concerned with compounds stable only under moderate conditions. This situation has begun to change with more widespread use of a sim-

High yields of gaseous boron monofluoride, BF, have been obtained by passing BF3 over crystalline boron at 2000" under 1 mm pressure. The short-lived B F gas condenses to a green polymer at -196", from which small amounts of volatile boron fluorides containing up to 14 boron atoms are released o n warming. Cocondensation of B F and BzF4 gives B3F6, triboron pentafluoride, an unstable, very reactive compound. Condensation of B F in the presence of CO or PFa gives (BF2),BC0 o r (BF2)3BPF3, respectively, which are stable crystalline compounds. oron monofluoride has been known to spectros-

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