A unique Au-Ag-Au triangular motif in a trimetallic halonium dication: silver incorporation in a gold(I) catalyst

Yuyang Zhu1, Cynthia S Day, Lin Zhang

  • 1Chemistry Department, Wake Forest University, Salem Hall, Box 7486 (USA), Fax: (+1) 336-758-4656.

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Electrophilic Addition to Alkynes: Halogenation

Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
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Formation of Complex Ions

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Metal-Ligand Bonds

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Coordination Number and Geometry

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