A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 14187-32-7, Name is Dibenzo-18-crown-6, molecular formula is C20H24O6. In a Article，once mentioned of 14187-32-7, Application In Synthesis of Dibenzo-18-crown-6
A new fulleride, (K[DB18C6])4(C60) 5·12THF, was prepared in solution using the “break-and-seal” approach by reacting potassium, fullerene, and dibenzo[18]crown-6 in tetrahydrofuran. Single crystals were grown from solution by the modified “temperature difference method”. X-ray analysis was performed revealing a reversible phase transition occurring on cooling. Three different crystal structures of the title compound at different temperatures of data acquisition are addressed in detail: the “high-temperature phase” at 225a K (C2, Z=2, a=49.055(1), b=15.075(3), c=18.312(4)a A, beta=97.89(3)), the “transitional phase” at 175a K (C2m, Z=2, a=48.436(5), b=15.128(1), c=18.280(2)a A, beta=97.90(1)), and the “low-temperature phase” at 125a K (Cc, Z=4, a=56.239(1), b=15.112(3), c=36.425(7)a A, beta=121.99(1)). On cooling, partial radical recombination of C60.- into the (C60) 22- dimeric dianion occurs; this is first time that the fully ordered dimer has been observed. Further cooling leads to formation of a superstructure with doubled cell volume in a different space group. Below 125a K, C60 exists in the structure in three different bonding states: in the form of C60.- radical ions, (C60) 22- dianions, and neutral C60, this being without precedent in the fullerene chemistry, as well. Experimental observations of one conformation exclusively of the fullerene dimer in the crystal structure are further explained on the basis of DFT calculations considering charge distribution patterns. Temperature-dependent measurements of magnetic susceptibility at different magnetic fields confirm the phase transition occurring at about 220a K as observed crystallographically, and enable for unambiguous charge assignment to the different C60 species in the title fulleride.
Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Application In Synthesis of Dibenzo-18-crown-6. In my other articles, you can also check out more blogs about 14187-32-7