22813-58-7Relevant articles and documents
Cyclic Oxonium Salts: 13C Magnetic Resonance Spectroscopy. The Correlation of Chemical Shifts with the Calculated Charge Density
Begue, J. P.,Bonnet-Delpon, D.
, p. 349 - 355 (1980)
The 13C chemical shifts of several bicyclic and monocyclic oxonium salts are reported and, in the case of 5-membered ring unsaturated oxonium salts, compared with ab initio and CNDO calculated charges.A prime dependence of the 13C shielding on the ? charge delocalization effects induced by the Y group is established for the Y-substituted C-α carbon; a good correlation of δC-α vs q? is obtained, using ? bond-order terms.However, contradictory information arises from NMR and theoretical calculations for the C-ω carbon, which is distant from the Y group.The results are discussed.
Piperdine and piperazine derivatives, and antihistaminic pharmaceutical compositions containing the same
-
, (2008/06/13)
Disclosed is a compound represented by Formula (I): STR1 wherein Ar1, Ar2, n, A, B and Z are as defined in claims. Disclosed are also a process for preparing the compound and pharmaceutical compositions containing the compound. The compound has an antihistamic and antiallergic effect.