benzylic造句
例句与造句
- The reaction begins with the extraction of a hydrogen from the nitrogen of the amide substituent and the extraction of a benzylic hydrogen from the substituent ortho to the amide substituent by a strong base.
- Under Corey & ndash; Kim conditions allylic and benzylic alcohols have a tendency to evolve to the corresponding allyl and benzyl chlorides unless the alcohol activation is very quickly followed by addition of triethylamine.
- Are there other effects at play ( besides I guess bond weakness ? ) In fact choosing iodide as a leaving group over chloride seems to give a much bigger energy advantage than benzylic / allylic!
- For example, a consistent system for benzylic aryl imines uses the P, N ligand SIPHOX in conjunction with iridium ( I ) in a cationic complex to achieve asymmetric hydrogenation with ee > 90 %.
- Manganese ( IV ) oxide ( manganese dioxide, MnO 2 ) is used as a reagent in organic chemistry for the oxidation of benzylic alcohols ( where the hydroxyl group is adjacent to an aromatic ring ).
- It's difficult to find benzylic in a sentence. 用benzylic造句挺难的
- Although virtually all types of organic materials can undergo air oxidation, certain types are particularly prone to autoxidation, including unsaturated compounds that have allylic or benzylic hydrogen atoms; these materials are converted to hydroperoxides by autoxidation.
- This is in agreement with the proposed mechanism ( a positive charge forms on the benzylic carbon and is stabilized by resonance; " R " dominates by a ratio of 0.8 / 0.2 ).
- "' Benzylic activation and stereocontrol in tricarbonyl ( arene ) chromium complexes "'refers to the enhanced rates and stereoselectivities of reactions at the benzylic position of aromatic rings complexed to chromium ( 0 ) relative to uncomplexed arenes.
- "' Benzylic activation and stereocontrol in tricarbonyl ( arene ) chromium complexes "'refers to the enhanced rates and stereoselectivities of reactions at the benzylic position of aromatic rings complexed to chromium ( 0 ) relative to uncomplexed arenes.
- In 2001, K . C . Nicolaou and co-workers published a series of papers in the Journal of the American Chemical Society demonstrating, among other transformations, the use of IBX to oxidize benzylic carbons to conjugated aromatic carbonyl compounds.
- In particular, the use of the photocatalyst Ir ( dtbbpy ) ( ppy ) 2 + allows the enantioselective ?-trifluoromethylation of aldehydes while the use of Ir ( ppy ) 3 allowed the enantioselective coupling of aldehydes with electron-poor benzylic bromides.
- This cumene radical then bonds with an oxygen molecule to give cumene peroxide radical, which in turn forms cumene hydroperoxide ( C 6 H 5 C ( CH 3 ) 2-O-O-H ) by abstracting benzylic hydrogen from another cumene molecule.
- The presence of the hydroxy-group on the benzylic C of the synephrine molecule creates a chiral center, so the compound exists in the form of two enantiomers, d-and l-synephrine, or as the racemic mixture, d, l-synephrine.
- The presence of the hydroxy-group on the benzylic carbon of the phenylethanolamine molecule creates a chiral center, so the compound exists in the form of two enantiomers, d-and l-phenylethanolamine, or as the racemic mixture, d, l-phenylethanolamine.
- On paper ( resonance structures ), the benzylic / allylic site looks quite reactive, but from the bond energies table I see that a benzylic and allylic C-H bond is only about 15 kcal / mol weaker than a " normal " C-H bond.
