P, Se-Heterocycles From the Quasi-Binary System PhP/Se
- 1 February 1989
- journal article
- abstracts
- Published by Taylor & Francis in Phosphorus, Sulfur, and Silicon and the Related Elements
- Vol. 41 (3-4) , 460
- https://doi.org/10.1080/10426508908039739
Abstract
Contrary to statements in the literature the PhP/Se system does contain a compound with a PhP/Se ratio lower than 1. The reaction of pentaphenyl-cyclopentaphosphane and elemental selenium yields depending on the molar ratio the heterocyclic compounds (PhP)4Se (1), (PhP)3Se3 (2), or (PhP)2Se4 (3). 1, 2, and 3 are yellow to orange-red crystalline stable compounds. Their molecular structures, as shown by the 31P- and 77Se-NMR data as well as by the X-ray crystal structure determination of 2, parallel those of the corresponding sulfur derivatives. Nucleophiles add easily to the phosphorus in 3 splitting the P2Se2-ring.Keywords
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