Nitrosyl chloride diazotization with

Nitrones = -V-alkylidene amine N-oxides, 153 Nitrosyl chloride diazotization with, 312-313 nitrite esters from, 286 nitrosation of enol ethers, 268 Nocardicinic acid, 3-amino- (ANA 1,1-dimethylethyl ester synthesis, 161... 

Instead of diazotation of >-aminostyrene units, the nitrosation of their acetamino derivatives with nitrosyl chloride has been described by Hahn (94), as well as the synthesis of diazoamino compounds. On decomposition these groups furnish active sites for monomer growth, e. g. acrylonitrile. s... 

Diazotization in organic solvents allows solid diazonium salts to be isolated. Diazotization can be carried out using an ester of nitrous acid, such as pentyl nitrite, in a solvent such as acetic acid or methanol. A procedure has also been described for isolating diazonium tetrafluoroborates, in excellent yield, by carrying out the diazotization with boron trifluoride etherate and f-butyl nitrite in ether or dichlorometh-ane at low temperature. Another method for the preparation of a variety of diazonium salts in a nonaqueous medium makes use of the chemistry of bis(trimethylsilyl)amines (8). These compounds react in dichloromethane with nitrosyl chloride and other nitrosating agents which are generated in situ. Thus, benzenediazonium chloride was isolated (96%) from bis(trimethylsilyl)aniline. 

Diazotization in a nonaqueous medium is useful in synthesis (review [2980]), as is demonstrated by the cyclization of the aminopyrazole (79.8) with nitrosyl chloride amines which lacked the methoxy group failed to cyclize on to the carbon atom [3201]. 2-Diazoazoles [such as (79.9)] undergo cycloadditions with... 

A second method of preparation consists of diazotization of the corresponding diamine l,10-BioH8(NH2)2 with nitrosyl chloride in glyme. This route is of no synthetic value, since the diamine is actually prepared from the bisdiazo compound. Knoth (1966) described briefly the synthesis of the diamine as its Tli salt by reaction of 3.11 with 100% ammonia at 200 °C in a platinum tube. The diazotization is mentioned by Knoth but not described. 

Nitrosyl chloride, NOCl, is an important chemical for nitrosification, oximisation, diazotation in the oil refining industry and in the production of dyes (diazotation with NOCI instead of nitrite), it serves as a catalyst in isopron polymerisation and as a non-aqueous solvent. It is formed from nitric oxide and chlorine... 

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