Capable of coupling

Are there substances in the sample capable of coupling reactions and where are they to be found in the chromatogram ... 

Phenols (capable of coupling) Fast blue salt B, fast blue salt BB, fast black salt K, diazotized sulfanilic acid (Pauly s reagent) diazotized sulfanilamide or 4-nitroaniline Intensely colored azo dyes are formed. Catecholamines [20, 3S], imidazoles [21] and amines capable of coupling also react. [3, 17]... 

Phenols and amines capable of coupling [4, 8] e.g. aniline derivatives, aminophenols [5]... 

Alkyl-OH 5-1 Can appear sharp and are capable of coupling to adjacent protons in dry aprotic solvents. Easily exchanged by shaking with D20. 

Figure 20.3 The reaction of SMCC with the amine groups on enzyme molecules yields a maleimide-activated derivative capable of coupling with sulfhydryl-containing antibody molecules.

Figure 22.12 The reaction of SPDP with PE creates a maleimide derivative capable of coupling thiols. Reaction with a sulfhydryl-containing molecule forms a conjugate through a thioether linkage.

The nucleotide bases of DNA and RNA can be activated with bromine to produce reactive intermediates capable of coupling to nucleophiles (Traincard et al., 1983 Sakamoto et al.,... 

Aminophenol is a useful dyestuff intermediate, capable of coupling in either the 2- or the... 

Even the doubly unsaturated hydrocarbons, such as butadiene, can be coupled with suitable diazo-compounds. Finally, not only phenols, but also phenol ethers, such as anisole, are capable of coupling (K. H. Meyer1). 

The method of reaction of the diazobenzene hydroxide is extraordinarily similar to that of nitrous acid practically all substances which are capable of coupling also react with this acid. Comparison of the formulae shows that in the diazo-hydroxide the bivalent radicle... 

Lovley DR, Giovannoni SJ, White DC, et al. 1993a. Geobacter metallireducens gen nov sp nov, a microorganism capable of coupling the complete oxidation of organic compounds to the reduction of iron and other metals. Arch Microbiol 159 336-14. 

The primary aromatic amines which will be preferentially nitrosated rather than diazotized are those which do not bear strongly electron-withdrawing substituents and are capable of coupling with diazonium salts to give azo dyes. 

Amino-l,2,4-thiadiazoles are usually prepared by treating amidine hydrochlorides with halogen and thiocyanates to yield the 3-alkyl derivatives or treating alkylisothiouronium salts similarly to yield the 3-alkylthio derivatives (56CB2742). Diazonium salts derived from 5-amino-l,2,4-thiadiazole derivatives, which are prepared in acetic acid, are extremely reactive and are capable of coupling with m -xylene (60CB397). 

The synthesis of a polymer requires the controlled coupling of a large number of monomer molecules to form the polymer chain. An obvious requirement for the monomer is that it shall be functionally capable of coupling to two other units and polymer chemists have long recognised three basic ways in which the required difunctionality can be achieved. 

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