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systems have led to clarification of the reaction mechanisms entailed. Experiments in cyclobutane have shown that during hot exchange reactions tritium transfers an energy of about 5 eV from its kinetic energy to excitation of the product molecule. Finally, first approaches have been made to theoretical expressions for the reaction probability of ener-The structures of proton-addition coriiplexes of aromatic hydrocarbons were hitherto known only with respect to their stoichiowietric compositions but can now be clarified by ultraviolet, infrared, and NMR spectroscopic methods. For example, it has been possible to prove by NMR soectroscqy that the expected addition of protons into 9,lO-dimethyl-[albenzanthrucene actually does take place. Two isomeric proton adducts of toluene have been found by means of infrared spectra. On addition of protons, the ultraviolet spectra of aromatics change considerably; excellent agreement is sometimes observed between the band niaxinia calculated by quantum mechanics and those found by experiment.

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Mit UV-, IR-und NMR-spektroskopischen Methoden kann man die Struktur der bisher nur ihrer stochiometrischen Zusammensetzung nach bekannten Proton-Additionskomplexe von Aromaten klaren. NMR-spektroskopisch konnte beispielsweise die erwartete ProtonenAnlagerung an 9.10-Dimethyl-1.2-benzanthracen bewiesen werden. Mit Hive der IRSpektren wurden am Toluol zwei isomere Proton -Addukte gejiunden. Die UV-Spektren der Aromaten andern sich bei Protonen-Anlagerung erheblich ; die quantenmechanisch berechneten und die experimentellen Bandenmaxima stimmen teilweise ausgezeichnet iiberein.