reacted with sodium pentacyanonitrosylferrate(II) (NP) to give red-brown or red-violet colored complexes under an alkaline condition. The solvolysis of the complexes gave ω-(hydroxyimino)alkanoic acids under a hot alkaline condition and gave ω-cyanoalkanoic acids or their esters in an acidic condition in good yields. These Products correspond to nitrosolysis products of cycloalkanones. The reaction mechanism