In 1965 a booklet by way of P. Bartlett seemed below the name "The Nonclassical Ions" 1). The publication is a set of papers reprinted from quite a few journals. the numerous studies that experience seemed because 2-22) are both antiquated (the e-book released in 1972 12) covers the literature mostly prior to 1968) or really biased (e.g., 3.4,10» on short 2, 7,11). This overview makes an attempt to debate some of the issues of view at the "nonclassical" carbocations. the most element is to set up the relative function of "nonclassical" and "classical" ions in a number of chemical methods. the writer has P. Bartlett's recommendation 1) that once surroundings forth the achievements of the human brain one should still see how we got here to the trendy figuring out of a given challenge (" ... how we all know what we know"). the speculation of "nonclassical" ions bargains an evidence of many specific chemical, stereochemical and kinetic peculiarities of bicyclic compounds. It has increased our wisdom on chemical bonds in carbocations by way of introducing electron-deficient bonds (as in boron hydrides). It has accounted for lots of rearrangements of reliable cations. As a "side" end result our wisdom has been prolonged approximately ionization tactics in an answer, in addition to approximately stereochemical equipment. 2 major phrases of Nonclassical Carbocations In 1939 Hevell, Salas and Wilson 23) assumed an intermediate, "bridge" ion 2 to be shaped while camphene hydrochloride 1 is rearranged into isobornyl chloride three. This occurred 17 years after Meerwein first postulated the intermediate formation of "carbonium" ions in chemical reactions.