compound, Φ3PSe [Φ = 2,6-(MeO)2C6H3], showed that the P=Se bond distance [2.136(2) A] was the longest among those of the reported triarylphosphine selenides, that the P–C bond distances [av. 1.839 A] were longer than those of triphenylphosphineselenide, and that all the P···O interatomic distances [2.794—3.189 A] were shorter than the sum of the van der Waals radii, implying a direct electron-donative
Tris(2,6-dimethoxyphenyl)arsine and tris(2,6-dimethoxyphenyl)stibine (Φ3M(Φ = 2,6-(MeO)2C6H3; M = As an Sb)) reacted with common alkyl halides (RX) to give [Φ3M-R]X, while Φ3Bi was unreactive in benzene, or it decomposed in hot alcohols. The reactions of Φ3M (As, Sb) with butyl bromide in acetonitrile were much faster than that of triphenylphosphine. Treatments of Φ3M (P, As, Sb)with N-bromosuccinimide
Tris(2,6-dimethoxyphenyl)phosphine sulfide reacted with alkyl iodides or bromides under mild conditions to give stable alkylthiophosphonium salts, which reacted with thiols at room temperature in the presence of a catalytic amount of tris(2,6-dimethoxyphenyl)phosphine to give the tertiary phosphonium salt and unsymmetrical disulfides.
Dimethyltin dihalides Me2SnX2 (X = Cl, Br) only form 1:1 complexes with 2,6-dimethoxyphenylphosphine oxides Φ3PO, PhΦ2PO and Ph2ΦPO (Φ = 2,6-(MeO)2C6H3) even though the ligands are used in excess. 2,6-Dimethoxyphenylphosphine sulphides Φ3PS and PhΦ2PS also form analogous 1:1 complexes, while Ph2ΦPS and Ph3PS do not react. X-Ray crystal structural analysis of Me2SnCl2·OPΦ3 reveals that the tin