Abstract
Abstract Flash vacuum pyrolysis (FVP) over freshly resublimed magnesium on glass wool is a convenient and powerful dehalogenating procedure for a wide range of organic halides. We have now applied this system to the generation of phosphinidenes from the corresponding dichlorophosphines. As shown below, the production of phospholane from 1 and the interesting pyrophoric polymer 3 from 2 are readily explained by intramolecular insertion of the phosphinidenes. Under similar conditions 4 gives not only the expected phosphinidene insertion product, the phosphaindane 5, but also as a minor product, the 3-H-phosphaindene (“phosphindole”) 6 - the first example of a new heterocyclic system and the first 3-H-phosphole of any type.
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