In Situ Generation of n‐Butanethiol and Its Reaction with Electron‐Deficient Olefines
摘要:
n-Butanethiol is generated in situ by sequential addition of n-butyllithium and water to elemental sulfur. The n-butanethiol formed was reacted with electron-deficient olefines to give Michael-type addition products in good yields. The method avoids the manipulation of the bad-smelling n-butanethiol.
Nouvelle méthode d'identification de thioalcools volatils par chromatographie sur papier
作者:A. Jacot-Guillarmod、P. Ceschini
DOI:10.1002/hlca.19590420310
日期:——
On dćrit une méthoded'identificationdethioalcoolsvolatilsparchromatographiesurpapier. La technique consiste dans l'analyse des dinitro-2,4-phényl-hydrazones des alcoylmercapto-3-propanals, formés par l'addition de ces thioalcools à l'acroléine.
A condensation product of a mercaptoaldehyde, e.g. butylmercaptopropionaldehyde, and phenol or a phenol having a substituent ortho or para to the hydroxyl group and being unsubstituted in a position ortho or para to the hydroxyl group, e.g. o-cresol, has free radical inhibiting and hydroperoxide decomposing properties. The condensate also has metal deactivating properties when the phenol has a halogen in an ortho or para position. The condensate which may be a bisphenol or a liquid or solid resinous material, is particularly useful as an antioxidant in liquid hydrocarbons.
It has been found that a sulphur containing resin which is the condensation product of (i) one or more mercaptoaldehydes and (ii) one or more meta-substituted phenols has good antioxidant properties. Mixtures of m/p-alkylphenols are used to particular advantage in the production of this resin. A small amount of the resin retards the oxidation of rubbers or polyolefins and the resin is particularly useful as a melt stabilizer during the extrusion of a polymer.
An amino/phenolic composition effective for enhancing the storage stability of aldehydes, particularly sulfur-containing aliphatic aldehydes of low molecular weight, i.e. those containing from 3 to 10 carbon atoms.