Te-methyl

According to semiempirical MNDO/PM3 calculations, the Te-methylated isomer 20 is energy-disfavored relative to 19. Moreover, the C—Te" bond in 20 is elongated (3.53 A) to such an extent that its stmcture should better be described as the carbenium ion 20a [94JCS(P2)2341]. 

Te-Methyl-2-phenylbenzotelluroniumazole perchlorate 20 behaves as a strong methylating agent in reactions with O- and N-nucleophiles (92MI1). 

By varying the conditions of the methylation reaction it is possible to prepare both N-methyl and Te-methyl derivatives of 2-phenylbenzotellurazole. The iodide of./V-methyl-2-phenylbenzotellurazole 17 is formed in 91% yield when heated in excess methyl iodide. When an equimolar amount of AgC104 is added, the methylation reaction provides the perchlorate of Te-methyl-2-phenylbenzotellurazole 18 in almost quantitative yield (88KGS136 89KGS989). The reaction represents the first known example of alkylation of a benzochalcogenazole on the chalcogen atom. It is easy... 

Sodium diethyl tellurophosphate, prepared from tellurium and sodium diethyl phosphite in absolute ethanol, was methylated by methyl iodide to give 0,0-diethyl Te-methyl tellurophosphate1. 

Tellurium may also be transformed by reduction and methylation (Chasteen and Bentley, 2003). Reduction of tellurite to Te results in a gray to black coloration of microbial colonies, with extracellular and intracellular precipitation being observed (Gharieb et al., 1999). Dimethyl telluride (DMTe) is the main product of Te methylation (Chasteen and Bentley, 2003). 

Dowanol TE Methyl Ether Ethoxy Triglycol Epoxidized Tall Oil, Octyl Ester Octyl Epoxy Tallate... 

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