Abstract
Abstract Lithium alkanetellurolates and lithium arenetellurolates were prepared by reduction of ditellurides with lithium in THF. Tellurium-125 chemical shifts of lithium alkanetellurolates, RTeLi (R = Me, Et, n-Pr, i-Pr, n-Bu, i-Bu, s-Bu and t-Bu) and lithium arenetellurolates, R'-C6H5-TeLi (R' = para-H, Me2N, MeO, Me2CHO, Me, C6H5O, F, C1, Br, Me3Si; R' = meta-MeO, EtO, Me2N, Me, F; R' = ortho-MeO and Me2N) were determined. Chemical shift trends for alkanetellurolates are compared with those previously reported for dialkyl ditellurides, dialkyl tellurides and bis(alkyltelluro)methanes. The 125Te shifts of alkanetellurolates plotted versus 77Se shifts of alkaneselenolates gave an excellent linear correlation. The substituent effects for para- and meta-substituted arenetellurolates are correlated with single- and dual-substituent parameter equations. Single parameter equations gave a poor fit, whereas dual-substituent parameter equations produced good linear correlations. The dual-substituent parameter equation of Taft is slightly better than the two-parameter equation of Swain and Lupton in correlating 125Te shifts of substituted arenetellurolates.
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