Synthetic Route of 14187-32-7. Chemistry is an experimental science, and the best way to enjoy it and learn about it is performing experiments.Introducing a new discovery about 14187-32-7, Name is Dibenzo-18-crown-6
Macrocyclic Receptor Molecules for Guanidinium Cations. Preparation, X-ray Structures, and Kinetic Stabilities of 1:1 Complexes of Guanidinium Perchlorate with Benzo-27-crown-9, Dibenzo-27-crown-9, and Dibenzo-30-crown-10
The complexation of guanidinium perchlorate with crown ethers of different ring size (18-33 ring atoms) and with different subunits, e.g., catechol and 1,3-xylyl moities, has been studied by using two-phase extraction experiments.The results demonstrate that the 18-crown ethers are able to form perching complexes, whereas crown ethers with <*>27 ring atoms have a siutable ring size to form encapsulated complexes with guanidinium perchlorate.Aromatic, catechol, and especially 1,3-xylyl moieties have a destabilizing effect on the complex formation.The crystal and the molecular structures of the 1:1 complexes of guanidinium perchlorate with benzo-27-crown-9 (7), dibenzo-27-crown-9 (8), and dibenzo-30-crown-10 (11) have been determined by X-ray crystallography.In these encapsulated complexes all hydrogen atoms of the guanidinium cation are used in hydrogen bonds to the macrocyclic host.The 27-crown ethers show an optimal fit between cation and the macrocyclic host with a complementary binding scheme.Dynamic 500-MHz (1)H NMR spectroscopy gave the kinetic stabilities of these complexes with DeltaGd* values of 11.5, 11.2, and 12.0 kcal mol-1 for the complexes with benzo-17-crown-9, dibenzo-27-crown-9, and dibenzo-30-crown-10, respectively.
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Chiral Catalysts,
Chiral catalysts – SlideShare