Tellurium- and Nitrogen-Containing Macrocycles

The tetraazamacrocycle 102 is the first known representative of tellurium-containing macrocycles. It was prepared in 80% yield by coupling bis-(o-formylphenyl) telluride (8IKGS121) with 1,2-diaminoethane [96JCS(D) 1203]. Reduction of 102 with NaBH4 gives rise to the tetraazamacrocyclic compound 103 [96JCS(D)1203]. 

With PdCh, the macrocycle 102 forms a stable 1 2 complex. When treated with HgCh, 102 undergoes ring opening, resulting in formation of a mixture of 104 and 105 in 41% and 60% yields, respectively [96JCS(D)1203]. 

Molecular and crystal structures of the macroheterocycle 102 were studied by X-ray [96JCS(D)1203]. As for bis-imines of di(o-formylphenyl) telluride 106, [89MI1 91JOM(402)331] only one of two potentially possible intramolecular coordination N- Te bonds exists in a molecule of the macrocycle 102, which, in 

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