Sinonimi & Informazioni su | Parola Inglese REGIOSELECTIVITY

Esempi di utilizzo di REGIOSELECTIVITY in una frase

• Steric bulk on the alkyne coupling partners and catalyst have been invoked as the controlling elements of regioselectivity.
• As isocyanides exhibit high functional group tolerance, chemoselectivity, regioselectivity, and stereoselectivity, the Passerini reaction has a wide range of synthetic applications.
• This reaction was discovered in 1988 by Tamejiro Hiyama and Yasuo Hatanaka as a method to form carbon-carbon bonds synthetically with chemo- and regioselectivity.
• This significant rate difference in producing di- and tri-alkyl boranes is useful in the synthesis of bulky boranes that can enhance regioselectivity.
• With diazo(phenyl)methane as the reactant the regioselectivity is reversed and the reaction is extended even further by simple air organic oxidation of the 2-pyrazoline to the pyrazole.
• It is possible to use benzoyl chloride but the yields and regioselectivity of the addition of the cyano group are lower.
• For terminal alkynes, the reaction generally proceeds with good regioselectivity (>90:10 rr) and complete syn selectivity, even in the presence of propargylic or homopropargylic heteroatom substituents.
• In the production of fine chemicals, flavors and fragrances, agrochemicals and pharmaceuticals an important benefit of enzymes is the high degree of chemoselectivity, regioselectivity and enantioselectivity which they exhibit.
• The in situ formation of the symmetric aliphatic anhydride is proposed to explain the regioselectivity observed in the reactions of aliphatic acids, based on the fact that aliphatic carboxylates are more nucleophilic, and aliphatic anhydrides are more electrophilic towards DMAP and alcohol than their counterparts.
• Although the reaction produces a regioisomeric mixture of triazoles, the lack of regioselectivity in the reaction is not a major concern for its applications in bioorthogonal chemistry.
• The difference in regioselectivity is more pronounced in the hydroboration of vinylarenes with HBcat.
• For terminal olefins (or acetylenes), the regioselectivity of the process can be described as Markovnikov (addition of X at the substituted end) or anti-Markovnikov (addition of X at the unsubstituted end).
• The regioselectivity and stereoselectivity of hydrosilylation of 1-methylcyclohexene with chloro(methyl)silanes depends on the number of chlorine atoms in the hydrosilylating agent.

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