ketene sentence in Hindi
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- One such example is the preparation of ketenes which may employ a tube furnace in the'ketene lamp '.
- When heated above, acetic acid decomposes to produce carbon dioxide and methane, or to produce ketene and water:
- Mechanistically, the ?-diazoketone undergoes a Wolff rearrangement to form a ketene in a 1, 2-rearrangement.
- "' Alkyl ketene dimers "'( AKDs ) are a family of organic compounds that are used in papermaking.
- The ketene formation during the deprotonation process for substrates possessing Evans'oxazolidinone is also a main side reaction for the related alkylation reactions.
- At high temperatures, Meldrum's acid undergoes a pericyclic reaction that releases acetone and carbon dioxide and produces a highly reactive ketene compound.
- Alt = Reaction of the pyrolysis-product ketene with amines, hydroxyl compounds, or water gives amides, esters, or carboxylic acids respectively
- Although nitrile anions are functionally similar to enolates, the extra multiple bond in nitrile anions provides them with a unique ketene-like geometry.
- Unlike the Staudinger ?-lactam synthesis, the Umpolung ketene in the Lectka ?-lactam synthesis behaves as the nucleophile rather than the electrophile.
- Deuterium stabilization can be accomplished through hydrolysis of a ketene precursor in the presence of a slight stoichiometric excess of heavy water ( D 2 O ).
- Alternately, the pyrolysis can be performed in solution, allowing a one-pot reaction with chemicals already present rather than isolating the unstable ketene intermediate.
- Because it is a dimer, it shares an empirical formula with CO . It can be thought of as ketene of glyoxylic acid ( OHCCOOH ).
- Cyclobutenone was originally synthesized from the 3-bromocyclobutanone and 3-chlorocyclobutanone precursors which were prepared from an allene and a ketene via two independent routes.
- In the exposed regions, the DNQ forms a ketene, which, in turn, reacts with ambient water to form a base soluble indene carboxylic acid.
- A Wolff Rearrangement of the diazoacetoacetate enone ( pink ) forms a stable ketene, which reacts with the imine to form a stable ?-lactam compound.
- In these contexts, it appears that the carbonite ion reacts with excess carbon monoxide to form an anion with the ketene structure, O = C =.
- The tertiary amine contained within the quinuclidine can act as a nucleophile that attacks the most electrophilic carbon of the ketene to promote the formation of ?-lactams.
- The greatest use of thermal Wolff rearrangements is the formation of carboxylic acid analogs, by interception of the ketene with high boiling solvents, such as aniline and phenol.
- The use of 2-chloroacrylonitrile as dienophile is a viable synthetic equivalent for ketene, Hydrolysis of the epimeric mixture of chloronitrile adducts revealed the desired bicycloheptanone in high yield.
- In the proposed reaction mechanism the base first converts the acid chloride to the ketene, the organocatalyst then introduces chirality through its quininoid tertiary amine, forming a ketene adduct.
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