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searching for Oxocarbenium 13 found (29 total)

N,N'-diacetylchitobiose phosphorylase (460 words) [view diff] exact match in snippet view article find links to article

a proton to the glycosidic oxygen atom, and then proceeds through an oxocarbenium cation activated by ion-like transition state. Park JK, Keyhani NO, Roseman

Anomer (880 words) [view diff] exact match in snippet view article find links to article

ionization to form an oxocarbenium ion with release of an alcohol, and nucleophilic attack by an alcohol on the reverse face of the oxocarbenium ion, followed

Koenigs–Knorr reaction (518 words) [view diff] exact match in snippet view article find links to article

elimination of silver bromide and the silver carbonate anion to the oxocarbenium ion. From this structure a dioxolanium ring is formed, which is attacked

Intramolecular aglycon delivery (907 words) [view diff] exact match in snippet view article find links to article

Br group) in the next step, the tethered aglycon traps the developing oxocarbenium ion at C-1, and is transferred from the same face as OH-2, forming the

Α-Glucosidase (1,751 words) [view diff] exact match in snippet view article find links to article

Two proposed mechanisms include a nucleophilic displacement and an oxocarbenium ion intermediate. Rhodnius prolixus, a blood-sucking insect, forms hemozoin

Hydrogen-bond catalysis (4,562 words) [view diff] exact match in snippet view article find links to article

addition of enol silane nucleophiles to oxocarbenium ions can be effected by catalytically forming the oxocarbenium through anion binding. Starting from

Endoglycosidase (747 words) [view diff] exact match in snippet view article find links to article

found to proceed through a single displacement mechanism involving an oxocarbenium ion-like transition state. Due to the retention mechanism's proximity

Marquis reagent (676 words) [view diff] exact match in snippet view article find links to article

formaldehyde condensing to the dimeric product which is protonated to the oxocarbenium salt. Drug checking Drug test Dille–Koppanyi reagent Folin's reagent

Synthesis of nucleosides (1,781 words) [view diff] exact match in snippet view article find links to article

instead, under Lewis acidic conditions they form a resonance-stabilized oxocarbenium ion. The diastereoselectivity of nucleophilic attack on this intermediate

Portentol (400 words) [view diff] exact match in snippet view article find links to article

acid catalyzed hemi-ketal formation within the cell to arrive at the oxocarbenium ion intermediate 3. The final bond formation between C7 and C2 would

Kinetic isotope effect (14,005 words) [view diff] exact match in snippet view article find links to article

concerted pathway to become asynchronous and approaches intermediates with oxocarbenium character of the SN1 mechanism for glycosylation. Jacobsen and coworkers

DNA-deoxyinosine glycosylase (1,301 words) [view diff] exact match in snippet view article find links to article

mechanism involves activating the leaving group, stabilization of the oxocarbenium ion, and positioning of a water molecule. Structural studies on human

Lewis acid catalysis (5,017 words) [view diff] exact match in snippet view article find links to article

substitution, the two reactions shown here should proceed via the same oxocarbenium ion and give similar stereochemical outcomes. Results indicate that the