PHENOXATHIIN CHEMISTRY. NEW CARBONYL COMPOUNDS AND DERIVATIVES

Starting with 2-acetylphenoxathiin , 2-ω-bromoacetylphenoxathiinyl-10, 10-dioxide 2 was obtained. By means of the Kornblum reaction the corresponding glyoxal 4 was synthesized. From compound 2, the aminothiazole 3 and the 1,4-diketone 7 were also obtained. By the reaction of 2-ω-bromoacetylphenoxathiin 8 and sodium acetylacetonate "one-pot" synthesis of 1,4-diketone 9 was performed. Compound 9 was converted to pyrrolophenoxathiin 11 and 1,4-diketone 7. Starting with the brominated derivative 8 the aminoketones 12 and 13 were obtained. The new compounds were characterized by spectral methods CH-and 13C-NMR, IR, MS).

Reduction of [NBu4][AuCl4] to [NBu4][AuCl2] with Sodium Acetylacetonate

The preparation of crystalline [NBu4] [AuCl2] in 85-90% yield by the reduction of [NBu4] [AuCl4] with sodium acetylacetonate is reported together with procedures for the quantitative synthesis of crystalline [NBu4] [AuX4] (X = Cl, Br) through direct oxidation of metallic gold in X2/[NBu4] X/ethanol, and the determination of the crystal structure of [NBu4] [AuCl4].