title: Formation and reactivity of novel pyranosidic nicholas oxocarbenium ions: access to C-ketosides and branched-chain C-ketosides.
abstract: [Structure: see text] Dicobalt hexacarbonyl propargyl complexes, prepared from alkynyl ketoses, display an unexpected reactivity when treated with Lewis acids in the presence of nucleophiles and furnish C-ketosides, branched-chain C-ketosides, or branched-chain C-glycals depending on the nucleophile and the carbohydrate starting material.
authors.affiliation: Instituto de Química Organica General (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain. anago@iqog.csic.es
authors.forename: Ana M
authors.initials: AM
authors.lastname: Gómez
authors.forename: Clara
authors.initials: C
authors.lastname: Uriel
authors.forename: Serafín
authors.initials: S
authors.lastname: Valverde
authors.forename: J Cristóbal
authors.initials: JC
authors.lastname: López
mesh_terms: D002241:Carbohydrates / Q000737:chemistry; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D006027:Glycosides / Q000138:chemical synthesis* / Q000737:chemistry; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis*; D013237:Stereoisomerism
chemical_list: D002241:Carbohydrates; D006027:Glycosides; D009942:Organometallic Compounds; D003035:Cobalt