Aldehydes amination

Accelerators are chemical compounds that iacrease the rate of cure and improve the physical properties of the compound. As a class, they are as important as the vulcanising agent itself. Without the accelerator, curing requires hours or even days to achieve acceptable levels. Aldehyde amines, thiocarbamates, thiuram sulfides, guanidines, and thiasoles are aU. classified as accelerators. By far, the most widely used are the thiasoles, represented by mercaptobensothiasole (MBT) and bensothiasyl disulfide (MBTS). 

Aldehyde-amines Aldol-naphthylamines Yes Not often used. Possibilities of carcinogenic hazard with some types. 

Silica gel Aldehydes, amines, ammonia, chorophenols, esters, inorganic acid gases, methanol, nitro compounds... 

Most studies in this field have been on nitrones. One of the reasons for this is probably because nitrones are readily available compounds that can be obtained from aldehydes, amines, imines, and oximes [2, 11]. Moreover, most acyclic ni-... 

The cationic polymerization of cardanol under acidic conditions has been referred to earlier [170,171], NMR studies [16] indicated a carbonium ion initiated mechanism for oligomerization. PCP was found to be highly reactive with aldehydes, amines, and isocyates. Highly insoluble and infusible thermoset products could be obtained. Hexamine-cured PCP showed much superior thermal stability (Fig. 12) at temperatures above 500°C to that of the unmodified cardanol-formaldehyde resins. However, it was definitely inferior to phenolic resins at all temperatures. The difference in thermal stability between phenolic and PCP resins could be understood from the presence of the libile hydrocarbon segment in PCP. 

Section 13.7). There are other systems (benzotriazole brighteners in copper, aldehyde-amine brighteners in tin) which enhance corrosion resistance. 

In general, the reaction mechanism of elastomeric polymers with vulcanisation reagents is slow. Therefore, it is natural to add special accelerators to rubber compounds to speed the reaction. Accelerators are usually organic compounds such as amines, aldehyde-amines, thiazoles, thiurams or dithio-carbamates, either on their own or in various combinations. 

Lithium-trimethoxy-hydrido-aluminat Aldehyd, Amin 2. 5... 

Natrium-bis-[2-methyl-propyl]-dihydrido-aluminat Aldehyd, Amin 10,11... 

Reaction between aldehydes, amines, and alcohols or phenols... 

To check the scope of this coupling reaction, a study with different combinations of aldehydes, amines, and terminal alkynes was performed. Aromatic alkynes turned out to be more reactive than aliphatic ones. This study included aliphatic... 

On the other hand, Kobayashi has developed a Bronsted acid-combined catalyst for aqueous Mannich-type reactions. Three-component Mannich-type reactions of aldehydes, amines, and ketones (e.g., benzaldehyde, p-anisidinc. and cyclohexanone) were efficiently... 

A one pot samarium-catalyzed three-component reaction of aldehydes, amines, and nitroal-kanes leads to pyrroles. The reaction proceeds via imines, generated from the amine and carbonyl compound, followed by the Michael addition of the nitro compound (Eq. 10.10).12a In... 

More recently, Miller and coworkers have reported a one-pot protocol for the preparation of thiazolidin-4-ones by condensation of aromatic aldehydes, amines, and mercaptoacetic acid in ethanol (Scheme 6.215 b) [387]. The optimized procedure involved microwave irradiation of a mixture of the amine hydrochloride, aldehyde,... 

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