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2005
Organo-tellurium compounds
S 0140
Regio- and Stereoselective Synthesis of Z-Vinylic Tellurides from Propargylic
A Route to Chiral Z-Enynes. — The regioselectivity concerning the
22- 184 Alcohols:
hydrotelluration of propargylic alcohols can be directed to 1,2-regioisomers by use of
their Tbs ethers. The conversion of (Z)-vinylic tellurides into the corresponding enynes
is exemplified for optically active derivative (VIIa), and is accomplished by coupling
with zinc alkynoates in the presence of catalytic amounts of Pd(0)/Cu(I). —
(RAMINELLI, C.; DA SILVA, N. C.; DOS SANTOS, A. A.; PORTO, A. L. M.;
ANDRADE, L. H.; COMASSETO*, J. V.; Tetrahedron 61 (2005) 2, 409-415; Inst.
Quim., Univ. Sao Paulo, 05508 Sao Paulo, Brazil; Eng.) — Klein
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