3-methyltelluro

The following compounds are the most popular donors for organic metals (see Scheme 8.9) TTF, tetraselenafulvalene (TSeF), tetrathiatetracene (TTT), tetraselenatetracene (TSeT), tetra-methyl tetraselenafulvalene (TMeTSeF), bis(thiadimethylene) tetrathiafulvalene (BTDM-TTF), bis(ethylenedithia) tetrathiafulvalene (BEDT TTF or ET), tetrakis(methyltelluro) tetrathiafulvalene (TTeCj-TTF), tetramethylbis(ethylenedithia) tetrathiafulvalene (TMET), 2,2 -(2,6-naphthalenediy-lydene) bis(l,3-dithiole) (NBDT). All the abbreviations are those used in the current literature. 

Inokuchi H, Imaeda K, Enoki T, Mori T, Maruyama Y, Saito G, Okada N, Yamochi H, Seki K, Higuchi Y, Yasuoka N (1987) Tetrakis(methyltelluro)tetrathiafulvalene (TTeCjTTF), a high-mobility organic semiconductor. Nature 329 39 0... 

The method employed earlier to obtain selenacoumarin (69BSB449) was also extended to the preparation of its tellurium analog 73.2-Methyltelluro-cinnamic acid was converted to its acyl chloride, which was cyclized to 73 in 20% yield under the action of A1C13 (84JHC1281). 

Reaction of methanetellurol with lithium aluminum hydride in diethyl ether caused liberation of hydrogen and formation of lithium tetrakis[methyltelluro]aluminate. This compound was not isolated but reacted with silyl or germyl halides to give silyl or germyl methyl tellurium derivatives4. 

Lithium tetrakis[methyltelluro]aluminate, prepared from methanetellurol and lithium aluminum hydride, reacted with silyl, germyl, and stannyl halides at low temperatures to produce, for instance, methyl silyl tellurium derivatives1. 

Methyl iodide methylated the tellurium atom in trialkylphosphane tellurides at room temperature with benzene as the reaction medium. The trialkyl(methyltelluro)phosphoni-um iodides precipitated as colorless to yellow solids2. 

The methylation of (/(-tellurido)bis[7t5-cyclopentadienyl(tricarbonyl)]chromium by methyl trifluoromethanesulfonate in diethyl ether at 20° produced a methyltelluro-bridged complex that was isolated as the hexafluorophosphatc2. The red-brown solid forms needles that are stable in air for a short time only. 

Lithium methanetellurolate and 1,2-dichloroethane did not produce l,2-bis[methyltelluro] ethane but gave dimethyl dilellurium2. 

Dimethyl ditellurium, but not diphenyl ditellurium, reacted with trichlorocyclopropenium salts6 or with tetrabromocyclopropene7 to give tris[methyltelluro]cyclopropenium compounds. 

Dimethyl ditellurium reacted with trichlorocyclopropenium salts3 and with tetrabromocy-clopropene4 to produce tris[methyltelluro]cyclopropenium salts. 

Bis[phenyltelluro]methane and bis[methyltelluro]methane reacted with elemental chlorine, bromine, and iodine to give the 7 ,7b-tetrahalides4 5 ... 

Methyl 2-chlorophenyl tellurium was quaternized by excess methyl iodide in refluxing acetone. 1,2-Bis[methyltelluro]benzene formed the ditelluronium compound under these conditions. When the ort/io-substituent in methyl 2-X-phenyl tellurium is a methoxy, methylthio, or methylseleno group that is also capable of quaternization, excess methyl iodide in refluxing acetone quaternizes only the methyltelluro group9. 

Similar reaction sequences converted 5-methyltellurophene via 2-lilhio-5-methyltelluro-phene to 2-carboxy-5-methyltellurophene (35% yield, m.p. 1500)1, and to 2-( 1-hydro xy-ethy l) -5-methyltellurophene2. 

---