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

Abstract

ABSTRACT

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

“…It was also found that compound 1 readily reacted with N-bromosuccinimide to form compound 10 (Scheme 1, Table 1). This result agrees well with previous works [4,13]. Compound 1 can be easily oxidized to telluronium salts with alkyl halides such as CH 3 I and C 2 H 5 Br, benzyl bromide, 2,6-dichlorobenzyl bromide, and 4-bromophenacyl bromide to form compounds 5, 6, 7, 8, and 9, respectively, in good yields (Scheme 1).…”

“…It is worth noting that the reaction of cyanogen bromide with compound 1 unexpectedly gave dibromo derivative 3 instead of di(cyclohexylmethyl)cyanotellurium bromide (Scheme 1). This is in contrast to previously reported works [4,11,12], and suggests that cyanogen bromide can be used as a brominating agent in such reactions. A 13 C NMR spectrum of compound 3, which was prepared by reacting compound 1 with BrCN, did not show a signal corresponding to C O (Table 1).…”

“…Furthermore, it was observed that methylation and demethylation equilibration in dimethylsulfoxide (DMSO) is reversible for methyltelluronium salts [5]. Our previous studies of heterocyclic telluronium salts showed that they are stable toward reductive elimination in CHCl 3 , DMSO, and DMF solutions [4,[6][7][8][9]. On the other hand, telluronium salts based on 2,2,6,6-tetramethyl-1-oxa-4-tellura-2,6-disilacyclohexane-containing benzyl or allyl groups reductively eliminated benzyl or allyl halides in CHCl 3 solutions [10], while methyl and ethyltelluronium salts were stable to reductive elimination [10].…”

“…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 polycondensation of some new organotellurium compounds containing hydroxymethyl groups

“…The large variation for carbon atoms bearing tellurium atoms can be attributed to the polarity of the TeÐC bond. 13,14 Solution polycondensation of 3, 4, and 7 with terephthaloyl chloride and TDI was the general method 15±17 used for the preparation of the new tellurium-containing polyester and polyurethane (Scheme 2). The polymerization reactions were carried out at ambient temperature and as described in our previous work.…”