From sodium ditelluride and aryl halides

The low reactivity of aryl halides towards nucleophilic reagents makes their reaction with sodium ditelluride unattractive for the preparation of diaryl ditellurides. Low yields are obtained, like the similar reaction with sodium telluride (see Section 3.1.2.1). 

Di-2-naphthyl ditelluride (typical procedure) ° 2-Chloronaphthalene (2 mol equiv) is added to Na2Tc2 (prepared by heating equimolar amounts of Te and Na in HMPA under N2). The mixture is heated at 130-170°C for 16-24 h (yield 20% m.p. 116-118°C, recrystallized from hexane). 

This method was later revised replacing sodium ditelluride by potassium ditelluride.  

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