The first synthesis of uracil based calix[4]arene derivatives
摘要:
The newly synthesized uracil based calix[4]arenes (4) possess anti-configuration (H-1 nmr and energy minimization), where the substituents (R-1) on aryl ring between N-1-positions of uracil face the pi-cloud of the ring between N-3-positions. (C) 1997 Published by Elsevier Science Ltd.
Host-guest complexation. 16. Synthesis and cation binding characteristics of macrocyclic polyethers containing convergent methoxyaryl groups
作者:Karl E. Koenig、George M. Lein、Peter Stuckler、Takahiro Kaneda、Donald J. Cram
DOI:10.1021/ja00507a021
日期:1979.6
demonstrate that, when the oxygens of anisole units are held in sterically enforced conformations which make the unshared electron pairs provide the lining of partially spherical cavities, the anisole units become better and more selective complexers of anions thanmore » the now classic crown ether compounds. Such conformations are observed only when m-teranisyl units are incorporated in macroring systems
Synthesis and molecular orbital calculations of some benzo-substituted macrocyclic diamides and their corresponding macrocyclic dithiodiamides
作者:Adel A. Mohamed、Ghada S. Masaret、Ahmed H.M. Elwahy
DOI:10.1016/j.tet.2007.03.007
日期:2007.5
have internal amine groups are less in energy than the other ones that have internal carbonyl groups. The solvent polarity does not appreciably affect the stability trend of the three conformers of each compound due to their comparable dipole moments. A complete and thorough survey of protonaffinity (PA) and proton detachment energies (PDE) on each of the possible sites has been performed.
Synthesis and structures of a new class of calixarene analogs derived from 5-t-butyltetrahydro-1,3,5-triazine-2(1H)one.
作者:Paritosh R. Dave、Gerald Doyle、Theodore Axenrod、Hamid Yazdekhasti、Herman L. Ammon
DOI:10.1016/s0040-4039(00)91849-5
日期:1992.2
Representative members of a novel class of calixarene analogs derivedfrom 5-t-butyltetrahydro- 1,3,5-triazine-2(1H)one 1 have been synthesized and their structures and conformations investigated by X-ray crystallography and NMR spectroscopy.
Synthesis of novel benzo-substituted macrocyclic schiff bases containing two triazole rings
作者:Ahmed H. M. Elwahy、Ghada S. Masaret
DOI:10.1002/jhet.5570440636
日期:2007.11
A synthesis of a series of novelmacrocyclicSchiffbasescontainingtwotriazolerings 10a,b, 11a,b, 34-37 in good yields by heating the appropriate bis-amines 1f, 6a,b, 31 with the corresponding bis-aldehydes 2, 9a,b, 29 in refluxing acetic acid under high dilution conditions was described. Attempts to synthesize macrocyclicSchiffbasescontaining pyridine and twotriazolerings were also described
A New Convergent Strategy for the Synthesis of Calixarenes via a Triple Annulation of Fischer Carbene Complexes
作者:Vijay Gopalsamuthiram、William D. Wulff
DOI:10.1021/ja0454236
日期:2004.11.1
A new method for the synthesis of unsymmetrical calix[4]arenes is described which involves the reaction of a diyne with a bis-carbene complex of chromium. This synthesis of calixarenes is unique in that it involves the formation of two of the four benzene rings of the calixarene and the macrocyclic ring of the calixarene in the same step. Thus, two of the four benzene rings of the calixarene are identical