Neighboring-group participation by sulfide sulfur in solvolytic interconversion between penam and cepham systems. A kinetic study on the solvolyses of 2'.alpha.- and 2'.beta.-halo-substituted-6-phthalimidopenam and 3.beta.-halo-substituted-7-phthalimidocepham methyl esters
Neighboring-group participation by sulfide sulfur in solvolytic interconversion between penam and cepham systems. A kinetic study on the solvolyses of 2'.alpha.- and 2'.beta.-halo-substituted-6-phthalimidopenam and 3.beta.-halo-substituted-7-phthalimidocepham methyl esters