A predictive model of interfacial interactions between functionalised carbon fibre surfaces cross-linked with epoxy resin
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Carbon fibers
Carbon chain
Surface Modification
Abstract The article contains sections titled: 1. Introduction 2. Aliphatic Diazo Compounds 3. Aromatic Diazo Compounds 3.1. Diazonium Salts 3.1.1. Properties 3.1.2. Diazotization 3.1.3. Other Methods of Preparation 3.1.4. Uses 3.2. Diazotates 3.3. Diazosulfonates 3.4. Triazenes 3.5. Other Aromatic Diazo Compounds 3.6. Analysis 4. Diazo Reactions 4.1. Chemical Transformation with Retention of the Diazo Group 4.2. Reactions at the Diazo Group 4.3. Dediazotization (Replacement of the Diazo Group) 5. Environmental Protection 6. Safety 7. Toxicology
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This chapter contains sections titled: Introduction Isomerization of Diazo and Diazonium Compounds Rearrangements Involving Addition Reactions of Diazo Compounds Rearrangements Involving Carbenes and Carbenoids Rearrangements Involving Diazonium Ions References
Diazonium Compounds
Wolff rearrangement
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The reaction of hydrazine hydrate with 1-diazo-3-, 1-diazo-4-, and 1-diazo-5-phthalimidoalkan-2-ones containing a substituent at the ..cap alpha.. position to the phthalimide group in the hydrocarbon chain leads to the formation of 1-diazo-3- and 1-diazo-4-(2-hydrazidophenylcarbamoyl)alkan-2-ones. On heating in the presence of an excess of hydrazine hydrate the reaction products are 1-diazo-3-, 1-diazo-4-, and 1-diazo-5-aminoalkan-2-ones. Various 1-diazo-3-, 1-diazo-4-, and 1-diazo-5-arenesulfamoyl-alkan-2-ones were synthesized in the reaction of arenesulfonyl chlorides with 1-diazo-3-, 1-diazo-4-, and 1-diazo-5-aminoalkan-2-ones in the presence of triethylamine.
Hydrazine (antidepressant)
Wolff rearrangement
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Abstract Diazo compounds (R 1 R 2 CN 2 ) are known as versatile and useful substrates for an array of chemical transformations and, therefore, diazo chemistry is still far from losing anything of its long‐standing fascination. In addition to many studies on the subsequent chemistry of the diazo group, the inventory of methods for the preparation of diazo compounds is continuously supplemented by new methods and novel variations of established procedures. Several of these synthetic approaches take into account the lability and remarkable chemical reactivity of certain classes of diazo compounds, and environmentally more benign procedures also continue to be developed.
Lability
Reactivity
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Construction of highly stable covalently attached multilayer films containing porphyrins was achieved by UV irradiation of ionic self-assembled multilayer films of diazo-resins (DAR) and tetrasodium 5,10,15,20-tetraphenyl-21H,23H-porphine-P,P′,P″,P‴-tetrasulfonic acid (tpps4).
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The structure of negative-working diazo resins has been investigated by means of quantum mechanical modeling of models for the polymerization processes leading to their formation. Comparison of the predicted heats of formation, the ultraviolet-visible (UV−Vis) spectra, and the infrared spectra with experimental results leads to the conclusion that the diazonium structure of 4-diazodiphenylamines is most stable in acidic media. The regioselectivity for the condensation polymerization reaction of such species with O-protonated formaldehyde cation was examined using atomic charge (electrostatic potential (ESP)), frontier molecular orbital, and product development approaches. Although methylol substitution at both rings seems possible, a reaction that leads to ortho- and para-substitution of the non-diazo-containing ring (β-ring) seems to be favored, according to product development and frontier orbital considerations. During subsequent polymerization, similar conclusions are reached regarding the electrophillic attack on 4-diazodiphenylamine by diazo carbocations derived from dehydration of 4-diazodiphenylamine methylol derivatives. In contrast, atomic charge considerations suggest the feasibility of the reaction involving the α-ring.
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Abstract This chapter describes the procedure for detrifluoroacetylative diazo group transfer:( E )‐1‐Diazo‐4‐phenyl‐3‐buten‐2‐one. It presents some of the important points to be considered, the conditions that need to be maintained, characterization data, and the reagents required, as well as the techniques used and the equipment setup that are vital to carrying out the process. The chapter also describes the hazards associated with working with chemicals and the ways to deal with these hazards. It then highlights the application of the detrifluoroacetylative diazo transfer method to several important classes of compounds.
Addendum
Characterization
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A new class of affinity resins using reversible covalent bonds is introduced for the separation of amine-containing molecules. pH-sensitive reversible formation of amic acid bonds between amines and carboxylate dimethyl maleic anhydride-decorated wrinkled silica nanoparticle resins was used to selectively retain and release amine-containing molecules, by controlling the pH.
Maleic anhydride
Maleic acid
Carboxylate
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The article contains sections titled: 1. Introduction 2. Aliphatic Diazo Compounds 3. Aromatic Diazo Compounds 3.1. Diazonium Salts 3.1.1. Properties 3.1.2. Diazotization 3.1.3. Other Methods of Preparation 3.1.4. Uses 3.2. Diazotates 3.3. Diazosulfonates 3.4. Triazenes 3.5. Other Aromatic Diazo Compounds 3.6. Analysis 4. Diazo Reactions 4.1. Chemical Transformation with Retention of the Diazo Group 4.2. Reactions at the Diazo Group 4.3. Dediazotization (Replacement of the Diazo Group) 5. Environmental Protection 6. Safety 7. Toxicology
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