TRIS-1-ADAMANTYLCYCLOTRIPHOSPHINE AND TETRAKIS-1-ADAMANTYLCYCLOTETRAPHOSPHINE - 2 PERADAMANTYLATED EXAMPLES FROM THE CYCLOPOLYPHOSPHINE SERIES (RP)(N)

Depending on the halogen substitution at the phosphorus atom, 1-adaman tyldihalophosphines of the type 1-AdPX2 (X = Cl, Br) react with sodium to give tris-1-adamantylcyclotriphosphine 1 (X = Cl) or tetrakis-1-ad amantylcyclotetraphosphine 2 (X = Br). The latter is also formed in th e reaction of approximately equimolar quantities of 1-adamantylphosphi ne and phosgene. The P-31-NMR-parameters are discussed and compared wi th those of the analogous (t)butyl compounds.