Preparation and Beckmann Rearrangement of<i>O</i>-(Chlorooxalyl)oximes
作者:Johannes C. Jochims、Sabine Hehl、Siegfried Herzberger
DOI:10.1055/s-1990-27112
日期:——
Oximes 1 react with phosgene or oxalyl chloride to give O-(chloroformyl)- 2, or O-(chlorooxalyl) oximes 8, which undergo Beckmann rearrangement with antimony pentachloride to afford nitrilium hexachloroantimonates 3 in high yields. With di- or triphosgene (4 or 6) oximes 1 form mixtures of O-(chloroformyl)- 2 and O-(trichloromethoxyformyl)oximes 5. The O-(chlorooxalyl)oximes 8 further characterized as esters 10 and amides 11. With N,N-dimethylformamide the nitrilium salts 3 react to give N-acyl formamidinium salts 12.