Über alicyclisches 1‐Oxy‐α‐tetralon und β‐Naphthohydrochinon; ein Beitrag zur Autoxydation mehrwertiger Phenole. 6. Mitteilung über Abkömmlinge hydrierter Naphthaline

Polarographic Studies of Metal Complexes. V. The Cadmium(II), Zinc(II) and Iron(III) Citrates

“…A comparison of Figs. 6 and 7 shows that I is always higher in the absence of gelatin, but that the difference decreases with increasing drop time. A reasonable extrapolation of the curve in Fig.…”

“…Consequently a thermodynamic interpretation of the half-wave potentials of zinc in citrate media is impossible. 4.98, (f) 5.34, (g) 5.75, (h) 6.10, (i) 6.48, (j) 6.87, (k) 7.08 and (1) 7.30. -Polarograms of 2 mM iron(III) in 0.12 F sodium citrate, pH: (a) 3.60, (b) 3.80, (c) 4.02, (d) 4.21, (e) 4.45, (f) 4.70, (g) 4.94, (h) 5.20, (i) 5.39, (j) 5.59, (k) 5.86, (1) 6.20, (m) 6.45, ( ) 6.70, (o), 6.91, (p), 7.10, (q), 7.40, (r) 7.72, (s) 7.92, (t) 8.20, (u) 8.41 and in 0.5 F sodium citrate, pH: (v) 12.02, (w) 12.25, (x) 12.55, (y) 12.78, (z) 12.89, and (zz) 13.09.…”

Advanced Routes in Synthesis and Reactions of Lawsone Molecules (2‐Hydroxynaphthalene‐1,4‐dione)

“…While reaction of β‐naphthol ( 4 ) with KOH and oxygen in the presence of copper phthalocyanine (147‐14‐8) as catalyst at pH 2.5 ; NaOH and oxygen in the presence of benzaldehyde, p‐chlorobenzaldehyde, p‐nitrobenzaldehyde at 0°C , 36995‐20‐7 as catalyst ; or NaOH, H 2 O 2 in the presence of 16456‐81‐8 at catalyst was yielded 2‐hydroxynaphthalen‐1,4‐dione (1) . Compound 1 was prepared from naphthalen‐1,2‐diol ( 5 ) under different conditions as following potassium oxide (KO 2 ) in pyridine or toluene at −10°C for 6 h ; crown‐ether in pyridine or toluene for 5 min ; KO 2 and tetraethyl ammonium bromide (Et 4 NBr) in DMF at 20°C ; or oxygen and aqueous–methanolic alkaline solution . Treatment of naphthalen‐1,3‐diol ( 6 ) with zirconium phosphate, phthalocyanine[Fe 3+ ], and oxygen in acetone at 20°C for 6 h in yield 80% ; or crown‐ether in pyridine or toluene for 5 min in yield 60% ; or KOH and air ; or Fremy's salt (K 4 [ON(SO 3 ) 2 ] 2 ) in methanol ; or air ; or KO 2 in THF or toluene at −10°C for 6 h afforded 1 .…”