in tetrahydrofuran other base (Et3N), solvent (CCl4); no cyclization products without base; a series of O-alkylhydroxamic acid investigated under similar conditions; possible mechanism discussed; Product distribution;

in tetrahydrofuran other base (Et3N), solvent (CCl4); no cyclization products without base; a series of O-alkylhydroxamic acid investigated under similar conditions; possible mechanism discussed; Product distribution;