Hydrogen functional groups

Derivatization Chemical reaction to improve separation or detection Treatment of active hydrogen functional group with electrophilic reagent Small volumes of reactive derivatization reagents... 

Spratt, M. P. and Dom, H. C., P-fluorohenzoyl chloride for characterization of active hydrogen functional groups hy fluorine-19 nuclear magnetic resonance spectrometry. Anal. Chem., 56, 2038-2043, 1984. 

Zawadzki, M. and D. Ergle Novel determination of phenolic and other labile hydrogen functional groups in the whole tar phase 61st Tobacco Science Research Conference, Program Booklet and Abstracts, Vol. 61, Paper No. 51, 2007, p. 46. 

Table 2.3 Near-IR absorption bands of hydrogenic functional groups contained in organic polymers.

Antioxidants markedly retard the rate of autoxidation throughout the useful life of the polymer. Chain-terminating antioxidants have a reactive —NH or —OH functional group and include compounds such as secondary aryl amines or hindered phenols. They function by transfer of hydrogen to free radicals, principally to peroxy radicals. Butylated hydroxytoluene is a widely used example. 

Fig. 3. (a) Chemical stmcture of a synthetic cycHc peptide composed of an alternating sequence of D- and L-amino acids. The side chains of the amino acids have been chosen such that the peripheral functional groups of the dat rings are hydrophobic and allow insertion into Hpid bilayers, (b) Proposed stmcture of a self-assembled transmembrane pore comprised of hydrogen bonded cycHc peptides. The channel is stabilized by hydrogen bonds between the peptide backbones of the individual molecules. These synthetic pores have been demonstrated to form ion channels in Hpid bilayers (71). 

In general, hydroboration—protonolysis is a stereoselective noncatalytic method of cis-hydrogenation providing access to alkanes, alkenes, dienes, and enynes from olefinic and acetylenic precursors (108,212). Procedures for the protonolysis of alkenylboranes containing acid-sensitive functional groups under neutral or basic conditions have been developed (213,214). 

Polymer Modification. The introduction of functional groups on polysdanes using the alkah metal coupling of dichlorosilanes is extremely difficult to achieve. Some polymers and copolymers with 2-(3-cyclohexenyl)ethyl substituents on siUcon have been made, and these undergo hydrogen hahde addition to the carbon—carbon double bond (94,98). 

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