Diamines types

This mechanism is based on the fact that the ozone uptake of elongated rubber containing a substituted p-phenylene diamine type of antiozonant is very fast initially and then decreases rather rapidly with time and eventually stops almost completely. The film has been studied spectroscopically and shown to consist of unreacted antiozonant and its ozonized products, but no ozonized rubber is involved [64], Since these ozonized products are polar, they have poor solubility in the rubber and accumulate on the surface. 

For many usual, moderately polar networks, such as epoxides of the diglycidyl ether of bisphenol A (DGEBA) diamine type, or vinyl esters, Hs —Hw, so that the equilibrium concentration appears almost temperature-independent. For most of the less polar networks such as polyesters or anhydride-cured epoxies, Coo (or Wro) increases slightly with temperature AW /AT 0.01 0.02% K 1 between 20 and 50°C. 

The crystallochemical analysis of complexonates has been carried out and the crystallostructural role of various ligands, on the formation of different coordination modes by metal atoms, is extensively reviewed [761-763], It is established that com-plexonate ions of the diamine type are capable of forming 14 different types of coordination [761], Depending on the coordination mode present, one polydentate diaminocarboxylate ligand has the capability to bind from one to four metal atoms, producing from two to 10 coordination bonds. 

In 1998, Loehlin and co-workers [44] reported the structures of five new crystals of the super-tetrahedral type formed by complementary amines and alcohols. They described the H-bonding networks of three complexes of the diamine type with monoalcohols 4-phenylenediamine (5)-phenol (16) (ratio 1 2, as in 5 16), 4-phenylenediamine (5)-4-phenylphenol (17) (ratio 1 2, as in 5 17), and 4-phenylenediamine (5)-4-chlorophenol (18) (ratio 1 2, as in 5 18) (Scheme 6). Two complexes of 4-phenylenediamine with diols were also reported 4-phenylenediamine (5)-2,6-dihydroxynaphthalene (19) (ratio 1 1, as in 5 19), and 4-phenylenediamine (5)-l,6-hexanediol (20) (ratio 1 1, as in 5 20). The H-bonded networks were... 

The basic approach to prepare Co(II)-complexes of salen (N,lSr-bis(salicylidene)ethylene-diamine)-type molecules is the flexible ligand method [9]. In this process the Schiffbase ligand can diffuse by twisting into the zeolite where it becomes too large to exit by complexation with the cobalt ion. The flexible ligand method, however, was not usefiil for the preparation of Co-salophen/ zeolite catalyst, because the product was inactive in the oxidation reactions. The salophen molecule does not seem to be flexible enough and can not get into the zeolite to produce the suitable complex in the supercage. 

Phosgenation of ethylene diamine type compounds is a well established method for the preparation of 2-imidazo-lidones (cyclic five membered ureas). The utility of this method is illustrated by the synthesis of a valuable intermediate (I) for D-biotine manufacture. We have developed an improved interfacial process which affords (I) in good yield and high purity as shown in scheme 213. 

Molybdenum-catalyzed alkylation of aryl-substituted allylic carbonates has been directed to give the alkylation at the substituted site affording the branched isomer as the major product with a high enantioselectivity by employing a specially designed diamine type ligand (Eq. 16) [37]. 

These results show that in the [Co(0,0)2(diamine)] -type complex the variation of 0,0-donor bidentates causes a change in the CD pattern observed. Thus, it seems worthwhile to examine the CD spectra for a series of c (N)-[Co(0,0)2(N)2]"-type complexes, where (N)2 represents a diamine or two unidentate N-donor ligands. Shibata et al. prepared such complexes. based on m-substitution of the ligating... 

The molecular weight decrease and the possibility of obtaining some reactions of the PVC with the aromatic diamine-type radical acceptors are conclusive arguments for a radical destructive mechanism of the polymers under vibratory milling conditions. Consequently, mechanodispersion is a mechanochemical-type process, developing itself according to the general laws of polymer fracture under stress. 

The catalytic enantioselective addition of diethylzinc to a-ketoesters was developed by Kozlowski [56]. Modular bifunctional Ti-salen [N,N -bis(salicylidene) ethylene-diamine] type catalysts that contain Lewis acid and Lewis base activating groups accelerate the carbonyl addition to a much greater extent than the competing carbonyl reduction. a-Hydroxyesters containing new quaternary stere-ogenic centers are obtained in high yields and moderate enantiomeric excesses (Scheme 14.10). 

Solvent extraction gas chromatographic methods have been described for determining alkylated cresols (2,6-di-tert-butyl-p-cresol) and amine antioxidants (N-phenyl-2-naphthylamine, p-phenylene diamine type) and Santoflex (NN sec-heptyl phenyl-p-phenylene diamine) in polybutadiene. 

Subst d p-phenylene diamine type, Santoflex 13 sec heptyl phenyl-p-phenylene diamine... 

H2N< C00H Polyamides 1. Amine (PA) + anhydride or acid (modifier) 2. Amine/carboxyl (PA) + epoxy (modifier) 3. Amine/carboxyl (PA) + isocyanate (modifier) 4. Carboxyl (PA) + oxazoline (modifier) 5. Carboxyl (PA) + nitrile (modifier) 6. Transamidation reactions (between PA and usually diamine type modifier)... 

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