1558-17-4Relevant articles and documents
Vapor phase phototransposition chemistry of dimethylpyrazines and dimethylpyrimidines
Pavlik, James W.,Vongakorn, Tharinee,Kebede, Naod
, p. 216 - 228 (2017/11/17)
Based on their phototransposition chemistry, the three dimethylpyrazines and four dimethylpyrimidines can be arranged into two groups. 2,5-Dimethylpyrazine, 2,5-dimethylpyrimidine, and 4,6-dimethylpyrimidine constitute a photochemical triad. Irradiation of any one member of the triad in the vapor phase results in the formation of the other two members. The other four isomers, 2,6-dimethylpyrazine, 2,3-dimethylpyrazine, 2,4- dimethylpyrimidine, and 4,5-dimethylpyrimidine constitute a photochemical tetrad. Irradiation of any one member results in the formation of the other three. In addition, 2,4-dimethylpyrimidine and 2,6-dimethylpyrazine also photoisomerize to 3,6-dimethylpyridazine. Irradiation of the last in the vapor state resulted in the four members of the tetrad.
POLAR EFFECTS IN THE HOMOLYTIC METHYLATION OF PYRIMIDINE: ORIENTATION AND POLYSUBSTITUTION
Giordano, Claudio,Minisci, Francesco,Tortelli, Vito,Vismara, Elena
, p. 293 - 296 (2007/10/02)
The homolytic methylation of pyrimidine in aqueous solution has been investigated with three different radical sources: tBuOOH-Fe(2+), MeCO2H-S2O8(2-)-Ag(1+), and MeSOMe-H2O2-Fe(2+).This last reagent, used for the first time in homolytic aromatic substitution, turned out to be the most efficient.The orientation of mono- and poly-methylated derivatives is discussed on the basis of polar effects.