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  2. Oxocarbenium - Wikipedia

    en.wikipedia.org/wiki/Oxocarbenium

    The general structure of an oxocarbenium ion. In organic chemistry, an oxocarbenium ion (alternatively spelled oxacarbenium) is a chemical species characterized by a central sp 2-hybridized atom of carbon, a substituent atom of oxygen, and an overall positive charge that is delocalized between the central carbon and oxygen atoms (R 2 [CO] + R). [1]

  3. Optical chemical structure recognition - Wikipedia

    en.wikipedia.org/wiki/Optical_chemical_structure...

    Optical chemical structure recognition (OCSR) is the translation of images that depict chemical structure information into machine-readable formats. [1] It addresses the challenge of translating chemical structures from graphical representations into their corresponding chemical formulas.

  4. Oxonium ion - Wikipedia

    en.wikipedia.org/wiki/Oxonium_ion

    Another class of oxonium ions encountered in organic chemistry is the oxocarbenium ions, obtained by protonation or alkylation of a carbonyl group e.g. R−C= + −R′ which forms a resonance structure with the fully-fledged carbocation R− + −O−R′ and is therefore especially stable:

  5. Carbenium ion - Wikipedia

    en.wikipedia.org/wiki/Carbenium_ion

    A carbenium ion is a positive ion with the structure RR′R″C +, that is, a chemical species with carbon atom having three covalent bonds, and it bears a +1 formal charge. Carbenium ions are a major subset of carbocations , which is a general term for diamagnetic carbon-based cations.

  6. National Medical and Dental College Admission Test - Wikipedia

    en.wikipedia.org/wiki/National_Medical_and...

    The MDCAT merit formula, also known as the aggregate formula, plays a crucial role in determining the overall merit for admissions in medical and dental colleges in Pakistan. The formula comprises contributions from different academic stages, allowing a comprehensive evaluation of a candidate's qualifications.

  7. Intramolecular aglycon delivery - Wikipedia

    en.wikipedia.org/wiki/Intramolecular_aglycon...

    Upon activation of the glycosyl donor group (Y) (usually SR, OAc, or 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 glycosidic bond stereospecifically. The yield of this reaction drops as the bulkiness of the alcohol increases.

  8. Polycarbonate (functional group) - Wikipedia

    en.wikipedia.org/wiki/Polycarbonate_(functional...

    They have the structure – O[(C=O)–O] n – and the molecular formula [C n O 2n+1] 2–. Whereas the carbonate dianion itself is well known, as found in many salts , many organic compounds containing esters of it have been made, and the parent carbonic acid is also well-known, higher homologs are substantially less stable.

  9. Rubottom oxidation - Wikipedia

    en.wikipedia.org/wiki/Rubottom_oxidation

    They hypothesized that the increased lifetime of the intermediate species would allow for over oxidation to occur. After a significant amount of optimization, it was found that an HOAc/Py buffer trapped the oxocarbenium intermediate and prevented overoxidation to exclusively give 2S-hydroxymutilin after hydrolysis of the silyl protecting groups.