Naphtho ditelluroles

The first representative of the 1,2-ditelluroles, 3,4,5,6,7,8-hexachloro-naphtho[l,8-ct/] 1,2-ditellurole 37, was obtained in low yield by heating octachloronaphthalene with elemental tellurium at 350°C (73USP3769276) by analogy with the method developed for the synthesis of congeneric 1,2-dithiole and 1,2-diselenole derivatives (72T963). 

The crystal structures of naphtho[l,8-rz/ -l,2-diselenole 4 and naphtho[l,8-r l-l>2-ditellurole 5 were reported <2004HAC530>. The Se-Se and Te-Te bond lengths are 2.3639(5) and 2.727(3)-2.7348(3) A, respectively, while the same bonds in PhSe-SePh and PhTe-TePh are 2.29 <1952AX458> and 2.712(2) A <1972AXB2438>, respectively. The structure of the tetraselenoanthracene 6 has also been reported <2001HAC287>. 

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