Poly hedr on Vol. 9, No. 7, PP. 943-948, 1990 zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Printed in Great Britain 0277-5387/ 90 $3.00+.00 0 1990 Pergamon Press plc zyxwvuts SYNTHESIS, CHARACTERIZATION AND STRUCTURAL ASPECTS OF DIORGANOTELLURIUM(IV) COMPOUNDS CONTAINING (TM) BONDS T. N. SRIVASTAVA and JAI DE0 SINGH Department of Chemistry, University of Lucknow, Lucknow 226007, India and SANJAY KUMAR SRIVASTAVA* School of Studies in Chemistry, Jiwaji University, Gwalior 474011, India (Received 25 April 1989 ; accepted 2 November 1989) Abstract-Diorganotellurium(IV) compounds containing (Te-S) bonds of the general formulae [R2Te(S2POGQ)d [R = Ph or p-MeOC6H4 ; G = -CH(Me)CH(Me)-, -Me2C-CMe,--, -CH2C(Me2)CH2-, (Me)CHCH,C(Me2)--, CH,C(Et,)CH,-] have been prepared by the reaction of R2Te(OR’), (R’ = Me or.Et) and corresponding O,O’- alkylene dithiophosphoric acids or by the reaction of R2TeC12 with [NH,S,POGG] in anhydrous toluene. The products have been characterized using analytical and spectroscopic (IR, ‘H, 13C, 3’P and “‘Te NMR) data. The products are monomeric in nature and their possible structures are discussed. Although several dithiocarbamates containing the (T-S) bond are well known,le4 the analogous dithiophosphate complexes are scarce.596This may be due to the instability of the products due to their reduction from Ten’ to Te” and the formation of the corresponding disulphides. Recently from this laboratory7-’ and also by other workers, ‘O*’ ’ it has been reported that diorganotellurium(IV) bis(O,O’- dialkyl dithiophosphates) [R2Te{S2P(OR’)2}2] decompose in low boiling solvents into R,Te” and the disulphides [(R’O),P(S)SS(S)P(OR’)~. In view of the increasing interest in (Te-S) bonded com- pounds, ’ I*12 we report the synthesis and char- acterization of [R,Te(S,POGQ),] compounds where the alcoholic (OR’) unit of [R2Te- {S2P(OR’)2}d is replaced by the glycolic unit. The stability of [R,Te(S,POGQ)d in comparison to that of [R,Te{S,P(OR’),)J derivatives is examined. RESULTS AND DISCUSSION The diorganotellurium(IV) bis(O,O’-alkylene dithiophosphates) were synthesized by the reaction * Author to whom correspondence should be addressed. of diorganotellurium(IV) alkoxides in anhydrous toluene by refluxing and removing the alcohol azeo- tropically or by stirring a mixture of diorgano- tellurium(IV) dihalide and the ammonium salt of the O,O’-dialkylene dithiophosphoric acids in 1: 2 molar ratio in toluene. Alternatively they may be prepared by the reaction of R2Te0 and cor- responding O,O’-alkylene dithiophosphoric acid in -2 R ‘OH [R = C6H, or p-MeOC,H,-; G = -(CH,)CHCH(CH,)-, --KH,),C-C(CH,),-_, -(CH,),CCH,CHCHs-, ~H2C(C2HWH,-_, CH2C(CH3)2CH2-]. 2,2’-dimethoxypropane. The yield of the products in the latter case is less than that by the former [eq. (l)]. Similar reactions in benzene gave products 943