Results 141 to 150 of about 6,933 (191)
eCyclopropanation - a safe and scalable electrochemical route to cyclopropanes. [PDF]
Chem SciWalsh JM +4 more
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Di-Silyl Rhodium(III) and Iridium(III) Complexes as Catalysts in Carbene Insertion Reactions into Hydrosilanes. [PDF]
OrganometallicsAzpiazu-Galarza A +4 more
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Enantioselective Synthesis of Spirolactones and Spirolactams Under Low Catalyst Loadings. [PDF]
J Am Chem SocSaito T, Navarro A, Davies HML.
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New Syntheses of Diazo Compounds
Angewandte Chemie - International Edition, 2009AbstractDiazo compounds (R1R2CN2) are known as versatile and useful substrates for an array of chemical transformations and, therefore, diazo chemistry is still far from losing anything of its long‐standing fascination. In addition to many studies on the subsequent chemistry of the diazo group, the inventory of methods for the preparation of diazo ...
Gerhard Maas
exaly +3 more sources
How Nucleophilic Are Diazo Compounds?
Chemistry - A European Journal, 2003AbstractThe kinetics of the reactions of benzhydryl cations with eight diazo compounds 1 a–g were investigated photometrically in dichloromethane. The nucleophilicity parameters N and slope parameters s of these diazo compounds were derived from the equation log k (20 °C)=s (E+N) and compared with the nucleophilicities of other π systems (alkenes ...
exaly +3 more sources
Homologation Reaction of Ketones with Diazo Compounds
Chemical Reviews, 2016This review covers the addition of diazo compounds to ketones to afford homologated ketones, either in the presence or in the absence of promoters or catalysts. Reactions with diazoalkanes, aryldiazomethanes, trimethylsilyldiazomethane, α-diazo esters, and disubstituted diazo compounds are covered, commenting on the complex regiochemistry of the ...
Roberta Paterna +2 more
exaly +3 more sources
Tetrahedron, 1988
Abstract Reaction of α-diazo ketones,RCOCN2R', with boiling carbon disulfide can give two major types of product: 2-alkylidene-1,3-dithiolan-4-one derivatives (Type A) and 4-acyl-2-alkylidene-1,-3-dithetane derivatives (type B). When R' = phenyl and R = phenyl or methyl, type A but not type B products are formed.
Peter Yates, J.A. Eenkhorn
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Abstract Reaction of α-diazo ketones,RCOCN2R', with boiling carbon disulfide can give two major types of product: 2-alkylidene-1,3-dithiolan-4-one derivatives (Type A) and 4-acyl-2-alkylidene-1,-3-dithetane derivatives (type B). When R' = phenyl and R = phenyl or methyl, type A but not type B products are formed.
Peter Yates, J.A. Eenkhorn
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Chemistry of Heterocyclic Compounds, 1974
Benzothiazole-2-diazonium tetrafluoroborate and its 6-bromo, 6-methyl, and 6-methoxy derivatives are relatively stable and have high electrophilicities. They are rapidly converted in weakly alkaline media to the corresponding anti-diazotates, from which primary nitrosoamines can be obtained by acidification.
V. V. Shaburov +2 more
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Benzothiazole-2-diazonium tetrafluoroborate and its 6-bromo, 6-methyl, and 6-methoxy derivatives are relatively stable and have high electrophilicities. They are rapidly converted in weakly alkaline media to the corresponding anti-diazotates, from which primary nitrosoamines can be obtained by acidification.
V. V. Shaburov +2 more
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Reaction of Diazo Compounds with Organoboron Compounds
Synthesis, 2013The transition-metal-free reactions of diazo compounds with organoboron compounds are reviewed. This type of reaction provides an alternative approach for the formation of C–C, C–B, and C–Si bonds. Moreover, by using tosylhydrazones as diazo compound precursors and boronic acids/esters as the boron substrates, this type of reaction becomes of practical
Jianbo Wang, Huan Li, Yan Zhang
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