Abstract
The nickel-catalyzed cross-coupling of ( Z)-1,2-bis(ethylseleno)ethene with the alkyl magnesium bromides proceeds with substitution of both ethylseleno groups to afford symmetrical alkenes, ( Z)-RCHCHR, in high yield with complete retention of configuration. In the case of phenyl magnesium bromide the monoarylation occurs to form ( Z)-2-ethylseleno styrene, EtSeCHCHPh.
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