By Mary Eagleson
Translated and revised from the unique German version of 1993, this reference for chemists, chemical engineers, and scholars comprises a few 12,000 entries and 1,600 figures, formulation, and tables. prepared alphabetically, the paintings includes an incredible volume of fabric on all fields of chemistry, in
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Are very unstable compounds, because the equilibrium of the addition reaction lies on the side of the reactants. A. g. chloral hydrate. Aldehyde resin: a synthetic resin produced by condensation of aldehydes, especially acetaldehyde, acrolein or furfural. Industrial syntheses in aqueous or alkaline media containing strong alkalies (concentrated sodium or potassium hydroxide) are most common. The first product is a water-sensitive, soft, crude resin; this is converted into an elastic, polishable, thermostable product which is insensitive to strong acids and bases by special treatments.
Appear between 2665 and 2880 c m " T h e signals of the aldehyde protons in ' H NMR spectra are to be expected in the range of δ = 9 to 10 ppm. In 13C NMR, signals in the range of δ = 180 to 210 ppm are very probably due to the C = 0 groups of A. and ketones. In the mass spectra of aromatic A. and ketones, a characteristic key fragment is the benzoyl cation. Occurrence and isolation. Various A. are found in low concentrations in plants, especially in numerous Aliphatic and aromatic aldehydes Formaldehyde Acetaldehyde Propionaldehyde Butyraldehyde Acrolein Crotonaldehyde Benzaldehyde Cinnamaldehyde Aldehyde acids.
A. g. alizarin black S. Alizarin, l,2-dihydroxy-9,10-anthracenedione occurs in the root of the madder plant, Rubia linctorum, in combination with 2 moles glucose. It was known and used in ancient Egypt, Persia and India. For key to substituents, see p. 36 0 R" 35 Alizarin violet Pigment Alizarin Alizarinbordeaux Purpurin Alizarin Orange Alizarin Red Alizarin Saphirol Β R1 R2 R3 OH OH OH OH OH Η OH OH Η OH OH NO 2 OH OH SO3H nh2 Η SO3H ( + S O 3 H in position 7) R4 Η Η OH Η Η OH R5 Η OH Η Η Η ΝΗ2 R" Η ΟΗ Η Η Η ΟΗ Alizarin violet: same as Gallein (see).