Die Reaktion einiger Pyridinaldehyde mit Schwefliger Säure

Abstract

Es wurde das Verhalten von α‐ und γ‐Pyridinaldehyd sowie 6‐Methyl‐α‐pyridinaldehyd gegen freie und gebundene Schweflige Säure untersucht. Abweichend von Benzaldehyd bilden die Pyridinaldehyde beständige freie Pyridyl‐oxy‐methansulfonsäuren. Ihre Herstellung und Eigenschaften sowie ihre analytische Bestimmung werden beschrieben. Für den α‐Pyridinaldehyd wird eine titrimetrische Bestimmungsmethode angegeben.

Polymorphism and Peroxomorphism in Peroxosolvates of Zwitterionic Sulfonic Acids: Features of H-Bonding and Crystal Packing

“…Bisulfite adduct of quinoline-2-carbaldehyde was prepared from aldehyde according to the literature method. 60,61 60 wt % hydrogen peroxide was purchased from Fisher Scientific (Loughborough, UK). 96 wt % hydrogen peroxide was prepared by an evaporation method.…”

“…Bisulfite adduct of quinoline-2-carbaldehyde was prepared from aldehyde according to the literature method. , …”

Sulfonation and Sulfation

“…The reaction of aqueous sodium bisulfite (1 mole) with ethylene oxide (13.33 moles) to yield a polyglycol alcohol sulfonate has been disclosed in an example in a recent patent (147). Possibly this reaction proceeds in two steps as follows: O CELCH2 + HSO,Na -> HOCH2CH2SOsNa O rCIUCH, + H0CH2CH2S03N a -> H0(CH2CH20)xCH2CH2S0"Na Three pyridine aldehydes have been shown (261) to add aqueous sulfurous acid or sodium bisulfite. The a-hydroxymethane sulfonic acids so obtained are stable, thereby differing from the similar derivatives prepared from benzaldehyde.…”