Halogens 25-iodanes

We propose a mechanism of carbon-halogen bond-forming ligand coupling of diaryl(halo)-A3-iodanes, which involves a highly polarized apical-equatorial transition state. Ligand coupling mechanism of p-chlorophenyl(p-methyl-phenyl)bromo-A3-iodane 77, which exists as an equilibrium mixture of 77a and... 

In the solid state of halo-A3-iodanes, halogen-bridged dimeric structures similar to 131 were reported for instance, diphenyl(halo)-A3-iodanes (Ph2IL L = Cl, Br, I) are isomorphous centrosymmetic dimers, held together by halogen bridges [5]. 

The reaction of difluoroiodotoluene with a four-, flve-, or six-membered carbocycles 47 affords the ring-expanded ( )-S-fluoro-3-halovinyliodonium tetrafluoroborates 48 stereoselectively in high yields (Scheme 3.17) [42], This reaction proceeds via a sequence of X -iodanation-1,4-halogen shift-ring enlargement-fluorination steps. 

Fig. 13 Halogen bonds blue dotted lines) formed by water left) and dimethylsulfoxide right) with the iodine atom of neutral X -iodane derivatives having a T-shaped pattern of covalent btnids around iodine. Color codes as in Fig. 2...

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