boxylic acid (2 mequiv) was dissolved in CHzClz (6-10 mL) with the addition of EhN or (~- BU)~ N (2" 01). With stirring N3P3C& (1 mmol) was added as a solid to the carboxlyate solution kept in a cold bath (-104" C). Immediately after dissolution (about 1 min), the reaction mixture was put into an IR cell (path length 0.1 mm), and the spectrum was recorded. The total operation time was-8 min. The IR spectra were identical with those ...
