It also acts in an opposite manner in certain cases, adding the elements of water to compounds; thus, nitriles are converted into acid-amides, and various acetylene derivatives may be caused to yield ketonic derivatives.
They are obtained by condensing a halogen derivatives of ketones with acid-amides (M.
The dihydro-oxazoles or oxazolines are similarly formed when 13-halogen alkyl amides are condensed with alkali (S.
Gattermann, Ann., 1888, 244, p. 30), melts at 50° C. and boils at 61-62° C. In the presence of anhydrous aluminium chloride it reacts with aromatic hydrocarbons to form the amides of aromatic acids.
Those containing more than one acyl group are formed by the action of carbonyl chloride on acid amides: COC1 2 +2CH 3 Conh 2 = Co(NHCOCH3)2+2HC1.