1,720,977 research outputs found
Recent advances in the chemical fixation of carbon dioxide: A green route to carbonylated heterocycle synthesis
Full text linkCarbon dioxide produced by human activities is one of the main contributions responsible for the greenhouse effect, which is modifying the Earth's climate. Therefore, post-combustion CO2 capture and its conversion into high value-added chemicals are integral parts of today's green industry. On the other hand, carbon dioxide is a ubiquitous, cheap, abundant, non-toxic, non-flammable and renewable C-1 source. Among CO2 usages, this review aims to summarize and discuss the advances in the reaction of CO2, in the synthesis of cyclic carbonates, carbamates, and ureas appeared in the literature since 2017
Reactivity of Nitro- and Nitroarenes with Vinyl Grignard Reagents: Synthesis of 2-(Trimethylsilyl)indoles
No full textThe reaction of nitrosoarenes and 1-(trimethylsilyl)vinilmagnesium bromide in dibutyl ether represents a useful tool for the synthesis of 2-(trimethylsilòyl)indoles by cyclisation of benzene derivatives. The use of more common ethers as solvent leads to large amounts of azo and azoxy derivatives. Conversely, the reaction of nitroarenes and 1-(trimethylsilyl)vinylmagnesium bromide gives conjugate addition products
Reactivity of acylsilane phenylhydrazones with phosphorus trichloride
No full textNitriles are obtained from reaction of acyltrimethylsilane phenylhydrazones with phosphorus trichloriide, whereas under the same experimental conditions triphenylsilyl derivatives decompose and t-butyldimethylsilyl derivatives do not react
Unexpected reactivity of allyl magnesium chloride with nitroarenes. A general method of synthesis of N-allyl-N-arylhydroxylamines and N-allylanilines
No full textIn contrast to alkyl Grignard reagents, the allyl reagent reacts with nitroarenes via 1,2-addition to the nitro grouop. The 'in situ' treatment of the unstable intermediate adduct with LiAlH4 in the presence of catalytic Pd/C provides a general synthesis of N-allyl_N-arylhydroxylamines or N-allylanilines
Opposite stereochemical effects exerted by CeCl3 and TiCl4 on the Lewis acid mediated reduction alfa-alkyl-beta-ketophosphine oxides
No full textN-Allylhydroxylamines from 1,2-Addition of Allyl Grignard Reagents to Nitro Compounds: Generality and Drawbacks of the Reaction
No full textAlkylation orientation rules in conjugate addition of Grignard reagents to nitropyrrole and nitrothiphene systems
No full textConjugate addition of various Grignard reagents to 1-alkyl-2-nitropyrroles and 2-nitrothiophene has been investigated. 1-Alkyl-2-nitropyrroles undergo alkylation at 3 and 5 positions with prebalence of the latter isomer. On the contrary, in 2-nitrothiophene system, formation of the 3-isomer prevails. In both systems, a bulkier Grignard reagents favours the 5-isomer formation. This reaction allows 2-alkyl-3-nitrothiophenes and pyrroles to be synthesized with a one-pot procedure instead of the classical multi-stage reaction
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