Phenol aldehydes

Phenol aldehydes
Salicylaldehyde
3-hydroxybenzaldehyde
4-hydroxybenzaldehyde
Protocatechualdehyde
Piperonal

Phenol aldehydes are aromatic aldehydes which, in addition to an aldehyde group, contain one or more hydroxyl groups on the aromatic nucleus. This group of substances includes: B. the following connections:

• Salicylaldehyde
• 3-hydroxybenzaldehyde
• 4-hydroxybenzaldehyde
• Protocatechualdehyde

According to another definition, the phenol aldehydes also include compounds in which the phenolic hydroxyl groups are optionally etherified . Examples:

• Anisaldehyde
• Vanillin
• Ethyl vanillin
• Piperonal

The substance group of phenol aldehydes is thus larger than that of hydroxybenzaldehydes. Most phenol aldehydes are crystalline and usually readily soluble in organic solvents. Usually only those phenol aldehydes that contain several hydroxyl groups are soluble in water.

Manufacturing

Phenol aldehydes are accessible by means of the Gattermann synthesis or the Reimer-Tiemann reaction .

See also

• Hydroxybenzaldehydes

Individual evidence

1. ^ ^{A b c} Hans-Dieter Jakubke, Ruth Karcher (coordinators): Lexicon of Chemistry in Three Volumes, Volume 3, Spektrum Verlag, Heidelberg 1999, ISBN 3-8274-0381-2 , p. 14.
2. ^ Otto-Albrecht Neumüller (editor): Römpps Chemie Lexikon , Frank'sche Verlagshandlung, 8th edition, Stuttgart 1983, ISBN 3-440-04513-7 , p. 3127.