Hypervalent tellurium compounds containing N -> Te intramolecular interactions. Crystal and molecular structure of [2-(Me2NCH2)C6H4](2)Te-2, [2-(Me2NCH2)C6H4]TeS(S)PR2 (R = Me, Ph, OPri) and [2-(Me2NCH2)C6H4]Te-S-PPh2=N-PPh2=S

[2-(Me2NCH2)C6H4]TeS(S)PR2 [R = Me (2), Et (3), Ph (4), OPr' (5)] were prep ared by reacting [2-(Me2NCH2)C6H4](2)Te-2 (1) with the appropriate disulfan es, [R2P(S)S](2), while [2-(Me2NCH2)C6H4]Te-S-PPh2=N-PPh2=S (6) was obtaine d by metathesis reaction between [2-(Me2NCH2)C6H4]TeBr and potassium tetrap henyldithioimidodiphosphinate. The compounds were characterized by multinuc lear NMR (H-1,C-13, P-31). The crystal and molecular structures of 1, 2, 4- 6 were determined by single-crystal X-ray diffraction. All compounds are mo nomeric and the N atom of the pendant CH2NMe2 arm is strongly coordinated t o the tellurium atom. The organophosphorus ligands are monodentate, thus re sulting in a T-shaped coordination geometry around tellurium. (C) 2001 Else vier Science B.V. All rights reserved.