acetylenic sentence in Hindi
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- It is also effective for the stereoselective reduction of certain acetylenic ketones.
- This is found to be most prominent in a broad range of sulfur or acetylenic compounds.
- The corresponding acetylenic alcohols are also suitable substrates, although the resulting propargylic aldehydes can be quite reactive.
- In this way the acetylenic protons are located in the cone-shaped shielding zone hence the upfield shift.
- The Hofmann Rearrangement also can be used to yield Acetylenic amides in good yields ( H " 70 % ).
- So the hardness of things like carbon nanotubes, graphene, and linear acetylenic carbon can't be measured.
- "' Propiolic acid "'is the organic compound with the formula HC 2 CO 2 H . It is the simplest acetylenic carboxylic acid.
- Muller and collaborators reported a vicinal functionalization of ?, ?-acetylenic esters using a Carbocupration / Mukaiyama aldol reaction sequence ( as shown in fig above ) carbocupration favors the formation of the Z-aldol.
- Chiral cationic oxazaborolidinium catalysts were shown to be effective in the three-component coupling of ?, ?-acetylenic esters, aldehydes, and trimethylsilyl iodide ( 50-99 % yield, 62-94 % ee ).
- In 1988 Nam and Leroy reported the matrix isolation ( 13K, Ar ) of 3, 4-pyridyne by photolysis of 3, 4-pyridinedicarboxylic anhydride with the IR-spectrum revealing an acetylenic bond in the same way as ortho-benzyne.
- The limits of flexibility of the carbyne chain are illustrated by a synthetic polyyne with a backbone of 8 acetylenic units, whose chain was found to be bent by 25 degrees or more ( about 3 degrees at each carbon ) in the solid state, to accommodate the bulky end groups of adjacent molecules.
- First stereoselective synthesis was reported by K . C . Nicolaou, more specifically, Sporolide B, through a highly stereoselective and convergent strategy that involves two important cycloaddition reactions : a thermally induced intramolecular [ 4 + 2 ] cycloaddition reaction involving an o-quinone and a tetrasubstituted olefin to form the macrocyclic structure of the molecule, and a ruthenium-catalyzed, intermolecular [ 2 + 2 + 2 ] cycloaddition reaction between two acetylenic units.
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