نتایج جستجو برای: 4 aryl 26 dipyren 1 ylpyridines
تعداد نتایج: 3451812 فیلتر نتایج به سال:
The racemic title compound, C(27)H(26)N(2)O(4), crystallizes with its central carbon bridge on a twofold axis. It forms parallel chains of mol-ecules utilizing aryl offset face-face inter-actions with an interplanar distance of about 3.5 Å. These chains associate further by means of pairs of O-CH(2)-H⋯π (with H-ring distances ranging from 2.69 to 2.95 Å) and O-CH(2)-H⋯N motifs. The meth-oxy gro...
1-Aryl- and 2-aryl-1,2,3-triazoles were synthesized by N-arylation of the corresponding azoles using aryl iodides. The deprotometalations of 1-phenyl-1,2,3-triazole and -1,2,4-triazole were performed using a 2,2,6,6-tetramethylpiperidino-based mixed lithium-zinc combination and occurred at the most acidic site, affording by iodolysis the 5-substituted derivatives. Dideprotonation was noted from...
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...
A novel class of aryl vinyl ethers 3 and diethyl 3-cyano-3-alkylprop-1-en-2-ylphosphonates 4 has been prepared, respectively, from coupling reaction of diethyl 1-(bromomethyl)-2-cyanovinylphosphonate 2 with phenols and Gilman reagents.
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