The synthesis of tetra-acrylamido-calix[4]arene capsules.
نویسندگان
چکیده
Upper rim substituted tetra-acrylamido-calix[4]arenes have been synthesised using the palladium catalysed Heck reaction; the compounds display solvent dependent aggregation in solution to form dimeric capsules stabilised by only eight amide C=O-H-N hydrogen bonds and pi-pi interactions.
منابع مشابه
Synthesis and capsule formation of upper rim substituted tetra-acrylamido calix[4]arenes.
Upper rim substituted tetraiodo calix[4]arenes are coupled to a variety of acrylamides using the palladium catalysed Heck reaction. Tetra-acrylamido upper rim substituted calix[4]arenes are obtained in good yields with exceptionally high stereoselectivity, to produce the all-trans isomers. Tetra-acrylamido calix[4]arenes derived from secondary acrylamides are shown to dimerise via eight hydroge...
متن کاملSelf-assembled dendrimers with uniform structure.
Calix[4]arenes substituted at their wide rim by four aryl urea residues (1) form hydrogen-bonded dimers in apolar solvents. Replacement of one urea residue by an acetamido moiety leads to calix[4]arene derivatives (5) which form hydrogen-bonded tetramers under the same conditions. Both self-assembly processes occur independently. Therefore, molecules have been prepared in which a tetra-urea cal...
متن کاملGuest exchange in dimeric capsules of a tetraurea calix[4]arene in the solid state.
A solid powder of hydrogen bonded dimers of a tetraurea calix[4]arene is able to exchange the encapsulated guest in contact with the vapor of a second guest. The molecules of a guest-free powder obtained from a polar solvent cannot rearrange in the solid phase to form new guest-filled capsules under these conditions.
متن کاملTheoretical and Conformational Study of Pinched-cone Interconversion in monosubstituted tri-methylsilyle ethynyl Derivative of Calix[4]arene
The conformational behavior of monosubstituted tri-methylsilyle ethynyl Derivative of Cal ix[4]arene as a newgeneration of Caliarene was compared with tetra alkylated calyx[4]arene. The most important conformationalphenomena in these compounds which are pinched cone interconversion process were done by semi-empiricalmethod and ab initio calculations with Gaussian 98w programming.
متن کاملLower-rim ferrocenyl substituted calixarenes: new electrochemical sensors for anions
New ferrocene substituted calix[4 and 5]arenes have been prepared and the crystal structure of a lower-rim substituted bis ferrocene calix[4]arene (7) has been elucidated. The respective ferrocene/ferrocenium redox-couples of compounds 6 (a calix[4]arene tetra ferrocene amide) and 8 (a calix[5]arene pentaferrocene amide) are shown to be significantly cathodically perturbed in the presence of an...
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ورودعنوان ژورنال:
- Chemical communications
دوره 19 شماره
صفحات -
تاریخ انتشار 2003