Is the Solar system location exceptional in the Galaxy

On the basis of known facts of anomalous content of 129I, 244Pu and 26Al isotopes possible schemes of the solar system formation are discussed. The Reeves hypothesis is taken as a basis according to which a presolar cloud is ''polluted'' by radioactive iodine, plutonium and aluminium isotopes when crossing the next Galaxy spiral arm. An assumption is made that the Sun in the Galaxy is in a particular situation near by the corotation circumference and rotates almost synchronously with density wave-spiral pattern. This creates particular conditions for evolution of the presolar cloud from which subsequently the contemporary solar system has come into existence