Solution studies of triorganotelluronium salts

Synthesis, characterization, and solution properties of some new organotellurium compounds based on di(cyclohexylmethyl)telluride

“…The spectrum of compound 5 was studied as a function of time; no change was observed after 24 h and the position of methyl resonance did not vary with time. This may indicate that alkylation and dealkylation reactions were in equilibrium as previously observed for other telluronium salts [1][2][3][4][5]. The 1 H NMR spectra of compounds 6, 7, 8, and 9 show extra signals, which may be due to the existence of compound 1, alkyl halides, and telluronium salts in the solution (Table 1).…”

“…The rates of reductive elimination depended on the nature of ionic group X [1][2][3][4]. Furthermore, it was observed that methylation and demethylation equilibration in dimethylsulfoxide (DMSO) is reversible for methyltelluronium salts [5].…”

Synthesis and Spectroscopic Investigations of Some New rganotelluronium alts Based on Dicyclohexyl Telluride

“…14,15 The reaction of compounds 6 with sodium tetraphenylborate gave compound 8 in good yield, which supports the formation of compound 6, Scheme 1. An authentic sample of 6 was prepared by reaction of dibenzyl telluride with cyclohexyl bromide and gave the same melting point and the same IR spectrum in comparison with compound 6.…”

Synthesis, characterization, and solution properties of new heterocyclic tellurium compounds based on 5,6‐dimethyl‐1,3‐dihydro‐2‐telluraindene

“…This indicates that these compounds tend to eliminate allyl and benzyl halides in DMSO solution. McWhinnie et al [2] gave some evidence obtained from spin trapping experiments for the involvement of a free radical as applied to the reductive elimination and to the oxidative addition of CH3X to Ph2Te. Thus, it seems likely that the reductive elimination of allyl and benzyl halides occurred via a free radical mechanism, since it is well known that ally1 and benzyl groups form relatively stable free radicals.…”

“…Some evidence for the involvement of a free radical was obtained from spin trapping experiments applied to both the reductive elimination and to oxidative addition of CH3X to Ph2Te [2]. Rainville and Zingaro [4] reported that the difference in the methyl 'H NMR resonance of 1 0-methylphenoxatelluronium iodide in DMF-d, versus that in (CD3)2S0 is due to the formation of phenoxatellurine and [(CD3)2SOCH3] + I-, and stated that this methylation and demethylation equilibrium is reversible for methyltelluronium salts [4].…”