X. Huang et Am. Sun, STEREOSELECTIVE SYNTHESIS OF (Z)-1-ALKYLSELENO-1-ALKENES BY NI-CATALYZED COUPLING REACTION OF (Z)-DIALKYLSELENOETHENES WITH ORGANOZINC HALIDES, Synthetic communications, 27(15), 1997, pp. 2725-2731
(Z)-Dialkylselenoethenes 2, prepared conveniently from the hydrozircon
ation of dialkylselenoacetylenes 1 with Cp2Zr(H) Cl in THF followed by
protonolysis, react readily at -10 degrees C in THF with organozinc h
alides in the presence of a catalytic amount of NiCl2(dppe) to give (Z
)-1-alkylseleno-1-alkenes 3 with retention of the configuration.