Уважаемые товарищи, помогите, пжалста, с вот этими статьями:
1. J. R. Einstein, J. L. Hosszu, J. W. Longworth, R. O. Rahn and C. H. Wei. Preparation and structure of a photodimer of 1-methylthymine // Chem. Commun. (London), 1967, 1063.
2. H. Morrison, A. Feeley and R. Kleopfer. Solution-phase photodimerization of dimethylthymine // Chem. Commun. (London), 1968, 358.
3. Lyn B. Davies, Peter G. Sammes and Robert A. Watt. New route to annulated pyridines and pyridimines // J. Chem. Soc., Chem. Commun., 1977, 663.
4. Joginder S. Bajwa and Peter J. Sykes. Synthesis and structure of some azolo[a]pyrimidines, 2,6,7,8-tetrahydro-1H-cyclopenta[e]azolo[a]pyrimidines, 6,7-dihydro-5H-cyclopenta[f]azolo[a]pyrimidines, 7,8-dihydro-6H-cyclopenta[f]-s-triazolo[4,3-b]pyridazine, 5,6,7,8-tetrahydro-azolo
quinazolines, 6,7,8,9-tetrahydroazolo[a]quinazolines, and 7,8,9,10-tetrahydro-s-triazolo[3,4-a]phthalazine // J. Chem. Soc., Perkin Trans. 1, 1979, 3085.
5. Joginder S. Bajwa and Peter J. Sykes. New steroidal heterocycles: synthesis and structure of androst-2-eno[2,3-g](tetrazolo[1,5-a]pyridimines), androst-4-eno[3,2-f](tetrazolo[1,5-a]pyrimidine), and androstano[17,16-f](tetrazolo[1,5-a]pyrimidines) // J. Chem. Soc., Perkin Trans. 1, 1980, 1019.
6. Lyn B. Davies, Osman A. Leci, Peter G. Sammes and Robert A. Watt. Intramolecular cycloaddition reactions of mono- and di-hydroxypyrimidines // J. Chem. Soc., Perkin Trans. 1, 1978, 1293.
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