<i>N</i>-Nitrosotolazoline: Decomposition Studies of a Typical <i>N</i>-Nitrosoimidazoline
作者:Richard N. Loeppky、Jianzheng Shi
DOI:10.1021/tx700318k
日期:2008.2.1
protonation of the imino nitrogen atom followed by slow general base-catalyzed addition of H2O to the 2-carbon of the imidazoline ring to give a tetrahedral intermediate, which is also a alpha-hydroxynitrosamine. Rapid decomposition of this species gives rise to the diazonium from which the products are derived by nucleophilic attack, elimination, and rearrangement. The proposed mechanism is supported by
A phosphorus-containing compound represented by formula (I) and a preparation method thereof are provided. An addition reaction is performed for an organic cyclic phosphorus compound with an aryl aldehyde compound, and then a condensation reaction is performed with an aryl compound having active hydrogen in the use of an organic acid as a catalyst to obtain the proposed phosphorus-containing compound. This phosphorus-containing compound can be used as a hardener for resin, and improves flame retardant properties and thermal resistance for a flame retardant epoxy resin composition, thereby suitably applied to resin compositions used for manufacturing printed circuit boards and laminated circuit boards in electronic or electric products.
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modified α-CT (α-CT-PEG) must be lower than 14.455 Å because the synthesis of peptides is not observed using 2-aminoethanol octanoate as nucleophile. α-CT-PEG is chemoselective towards the aromatic esters because unnatural aliphatic esters are not hydrolyzed in the presence of N-benzoyl-L-Tyrosine ethyl ester. Unnatural aliphatic acyl-donors with a distance smaller than 8.8 Å are recognized by the chemically