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Carbohydrates armed/disarmed

Cooperativity/competUion among acceptors (armed/disarmed carbohydrates) Cleavage of the C-X bond at the anomeric position proceeds via evolution of the anomeric n o C-X interaction that culminates in the oxocarbenium ion. This carbocation is so strongly stabilized by n j- p interaction that this interaction is commonly described as a dative it-bond. Because oxacarbenium ions are strongly stabilized, their formation is relatively facile. In cross-coupling glycosylalion reactions, however, it is beneficial to differentiate the reactivity of two saccharides for the selectivity reasons. The competition and cooperativity between stereoelectronic effects can be used to fine-tune the reactivity of anomeric systems. [Pg.288]

Armed-Disarmed Effects in Carbohydrate Chemistry History, Synthetic and Mechanistic Studies... [Pg.2]

Keywords Armed-disarmed strategy. Carbohydrates, Chemoselective activation. Expeditious S3mthesis, Glycoconjugates, Glycosylation, Oligosaccharides, Synthetic strategy... [Pg.189]

See other pages where Carbohydrates armed/disarmed is mentioned: [Pg.50]    [Pg.60]    [Pg.107]    [Pg.1707]    [Pg.163]    [Pg.214]    [Pg.64]    [Pg.68]    [Pg.4]    [Pg.8]    [Pg.10]    [Pg.12]    [Pg.30]    [Pg.189]    [Pg.217]    [Pg.227]    [Pg.399]    [Pg.236]    [Pg.411]    [Pg.543]    [Pg.95]    [Pg.543]    [Pg.70]   
See also in sourсe #XX -- [ Pg.288 , Pg.291 , Pg.295 ]



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Armed-disarmed

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