Tetra boric acid-sulfuric

Tetra(Hydrogen Sulfato)Boric Acid-Sulfuric Acid. HB(HS04)4 prepared by treating boric acid, B(OH)3, with sulfuric acid ionizes in sulfuric acid as shown by acidity measurements7 [Eq. (2.19)]. [Pg.47]

Tetra(hydrogensulfato)Boric Acid-Sulfuric Acid... [Pg.298]

Lam et al. 226) have reported syntheses of valsarin and 2,4-di-chloroemodin and a new synthesis of 2-chloroemodin (Scheme 18). Thus Friedel-Crafts acylation of a substituted resorcinol (162) with 3-methoxy-5-methylphthalic anhydride gave a crude benzophenone which was treated with boric oxide-sulfuric acid to yield the anthraquinones, 2-chloroemodin (163) and 2,4-dichloroemodin (164). 2,4-Dichloroemodin on treatment with boric acid and sulfuric acid gave valsarin (165). Tetra-O-methyl-valsarin was also synthesized via chlorination of xanthorin. [Pg.134]

The conclusion that the boron tetra (hydrogensulfate) ion is formed in these solutions is of great interest since, as it apparently does not undergo solvolysis, the corresponding acid HB (HSO ) 4 must be a strong acid in the sulfuric acid solvent system, and must be extensively ionized according to Eq. (55) above. The solutions formed by dissolving boric... [Pg.408]

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