Abstract
A 2-silyl-1,3-diphosphapropene was utilized as an asymmetrical P2 ligand of stable palladium(II) catalysts. Several phosphaalkene ligands were utilized for synthesis of novel gold(I) complexes which exhibited unique catalytic activity in 1,6-enyne cycloisomerization, indicating effects of P = C double bond, Au–Au contact, and sulfanyl group.
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Acknowledgments
We thank Mr. Sou Hashino, Tohoku University, for conducting the reaction of 6 to 8 in the presence of 4 and Prof. Noboru Morita for his helpful comments and suggestions.