A photoiniferter ability of the 10-I-3 iodanes* is established during the bulk polymerization of methyl methacrylate, styrene and N-vinylpyrrolidone. The observed spectral selectivity is its important peculiarity, opening new possibilities for the control of the macromolecule microstructure. Under visible light these iodanes initiate the "pseudoliving" radical polymerization, while a conventional radical or cationic polymerization are the consequences of the iodane decomposition under UV irradiation. It is suggested that the spectral selectivity of the 9-I-2 iodanyl radical decomposition and the relative instability of the ends of the iodane macromolecule are the reasons of this unusual iodane ability.