Ring Compounds with P, Se and C Atoms

Selenoxophosphine-metal complexes have been synthesised (Chapter 8.20). 9.11.11 Ring Compounds with P, Se and C Atoms 

Worthy of note are the recently reported reactions (9.693) which gave an unexpected result of ring formation [46]. The intermediate selenide in Equation 9.693 can be compared with the triphospha-pentadienide anion (9.694) obtained a decade earlier [47]. 

Various rings are obtainable by reacting (PPh)5 with metallic selenium [48,49]. 

Woolins reagent undergoes reactions (9.696) to produce rings of P, Se, C and O atoms [50-52], 

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