title: The 2-phosphaethynolate anion: a convenient synthesis and [2+2] cycloaddition chemistry.
abstract: Hip to be square: Direct carbonylation of solutions of the heptaphosphide trianion (P7(3-)) afforded the phosphaethynolate anion in moderate yields. This species undergoes [2+2] cycloaddition reactions with diphenylketene and bis(2,6-diisopropylphenyl)carbodiimide to yield the anionic four-membered heterocycles P[C(O)]2C(C6H5)2(-) and PC(O)(CNDipp)NDipp(-) .
authors.affiliation: Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA (UK) http://research.chem.ox.ac.uk/jose-goicoechea.aspx.
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Jupp
authors.forename: Jose M
authors.initials: JM
authors.lastname: Goicoechea
keywords: cycloaddition; organophosphorus chemistry; phosphaethynolate anion; phosphorus; polyphosphides