1. Reaction of sym-octahydroacridine N-oxide with acetic anhydride in the presence of an aromatic aldehyde

   • G. A. Klimov
   • M. N. Tilichenko

   Letters to the Editor Pages: 133 - 134

2. Synthesis of derivatives of imidazo[1,2-a]imidazole

   • P. M. Kochergin
   • B. A. Priimenko

   Letters to the Editor Pages: 134 - 134

3. Synthesis of derivatives of condensed imidazole systems from 2-haloimidazoles and 8-haloxanthines

   • P. M. Kochergin
   • B. A. Priimenko
   • M. I. Yurchenko

   Letters to the Editor Pages: 135 - 135

4. The existence of a transannular bond between the silicon atom and the nitro group in the molecule of 5-nitro-2,2,5-trimethyl-2-sila-1,3-dioxane

   • M. G. Voronkov
   • V. A. Pestunovich
   • Yu. P. Romadan

   Letters to the Editor Pages: 135 - 136

5. A new method for the synthesis of 2,6-diaryl-substituted pyrylium salts by the acylation of phenol ethers with glutaric acid in the presence of polyphosphoric acid (PPA)

   • G. N. Dorofeenko
   • V. E. Ryabinina
   • E. V. Kuznetsov

   Letters to the Editor Pages: 136 - 137

6. Structure of the condensation product of 3,4-xylenol with crotonaldehyde

   • S. P. Starkov
   • L. V. Glushkova

   Letters to the Editor Pages: 137 - 137

7. Synthesis of 1-alkyl-, 1-aralkyl-, and 1-aryl-2-aminoimidazoles

   • B. A. Tertov
   • V. V. Burykin

   Letters to the Editor Pages: 137 - 138

8. Cyclohydrazinocyanation of 2,2'-methylene-bis-cyclohexanone

   • V. A. Kaminskii
   • V. K. Gamov
   • M. N. Tilichenko

   Letters to the Editor Pages: 138 - 138

9. A new trifluoromethyl analog of riboflavin

   • Z. V. Pushkareva
   • G. A. Vavilov

   Letters to the Editor Pages: 139 - 139

10. Synthesis of 2-(5'-nitro-2'-furyl)benzimidazoles

    • F. T. Pozharskii
    • V. Ts. Bukhaeva
    • R. A. Savel'eva

    Letters to the Editor Pages: 139 - 140

11. Bromine mobility in 2-acetyl-3-bromofuran

    • L. A. Boiko
    • Yu. A. Boiko
    • Z. N. Nazarova

    Letters to the Editor Pages: 140 - 140

12. Opening of the imidazole ring in imidazo[1,2-a]benzimidazoles

    • A. M. Simonov
    • V. A. Anisimova
    • Yu. V. Koshchienko

    Letters to the Editor Pages: 140 - 141

13. Synthesis of alkyl-substituted porphyrinogens

    • G. V. Ponomarev
    • R. P. Evstigneeva
    • N. A. Preobrazhenskii

    Letters to the Editor Pages: 141 - 141

14. The closure mechanism of the 1,3,4-oxadiazole ring by means of phosphorus oxychloride

    • Ya. A. Levin
    • M. S. Skorobogatova

    Letters to the Editor Pages: 142 - 142