LES ALCYNES PDF

Interactions des alcynes avec les complexes carbéniques du tungstène portant une double liaison carbone— carbone: Accès aux dérivés bicyclo[4,1,0]. Download Citation on ResearchGate | Réaction des halogenures de titane(IV) avec les alcynes: Formation d’halogénoalcènes | The behaviour of some mono-. Download Citation on ResearchGate | Action du chlorure de fer(III) sur les alcynes: Reduction du fer(III) en fer(II) et formation d’un chloro-alcene | The behaviour.

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In Chapter 5, a new way to control the enantioselectivity in 1,3-dipolar cycloaddition reactions ls described. Access to the full text of this article requires a subscription. Applications of new phosphorus-based 1,3-dipolar cycloaddition reagents in nitrogen heterocycle synthesis. All items in eScholarship McGill are protected by copyright with all rights reserved unless otherwise indicated.

Polycyclic less are generated in rapid cycloaddition reactions, in a modular fashion from easily accessible starting materials: Cycloaddition reactions of the above mentioned dipoles are examined with a range of unsymmetrical electron poor and electron rich alkynes, and by comparing the behavior of these related dipoles, trends are observed in regioselectivity that relates to the alkyne ionization potential.

Enantioselective alcyns of carbonyl compounds by whole-cell biotransformation, combining a formate dehydrogenase and a R -specific alcohol dehydrogenase. Outline Masquer le plan.

If you want to subscribe to this journal, see our rates You can purchase this item in Pay Per View: These 1,3-dipoles have been previously demonstrated lds be accessible in a one-pot reaction of imines, acid chlorides and organophosphorus reagents, and participate in 1,3-dipolar cycloaddition reactions.

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A unique role in the addition of diazoalkane carbene to alkynes. You can move this window by clicking on the headline. Substrate specificity and enantioselectivity of 4-hydroxyacetophenone monooxygenase. Library homepage About open access About eScholarship Report a copyright concern. Double catalytic addition of diazo compounds to alkynes: The objective of the research described in this thesis is to both understand the reactivity of these dipoles, and exploit their cycloaddition with alkynes and alkenes to synthesize pyrroles and 2-pyrrolines with high regio- diastereo- and enantioselectivity.

Enzymatic processes for the production of 4-substituted 3-hydroxybutyric acid derivatives and vicinal cyano, hydroxy substituted carboxylic acid esters.

Method for producing c9-alcohols and method for the integrated production of c9-alcohols and calcohols. Kind code of ref document: Propargylic carboxylates lead to conjugated dienes by coupling of the diazoalkane carbene with the alkyne terminal carbon and 1,2-shift of the carboxylate. Methods of refining and producing dibasic esters and acids from natural oil feedstocks.

Importantly, these 1,3-dipoles display divergent regioselectivity, which can be exploited to synthesize a variety of pyrroles with high selectivity through the use of the appropriate reactant. As per the Law relating to information storage and personal integrity, you have the right to oppose art 26 of that lawaccess art 34 of that law and rectify art 36 of that law your personal data. The University’s open access institutional repository: Title Creator Subject Faculty Date.

While each of the dipoles are established to participate in 1,3-dipolar cycloaddition reactions, until now, no general rules regarding the factors that control regioselectivity have been described.

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les alcynes cours pdf

US USA1 en Similarly, the rational lacynes regioselectivity also allows the prediction of regioselectivity for a wide scope of alkynes. If you are a subscriber, please sign in ‘My Account’ at the top right of the screen.

Catalysis, Ruthenium, Diazo compounds, Carbene, Alkynes. Different phosphites and phosphonites are tested for their ability to mediate intramolecular cycloaddition with alkenes, and optimum results are obtained with 2-catechyl PPh. In addition, the reaction proceeds with high diastereo- and regioselectivity.

CHIM 263 – Chimie organique II

Catalytic addition of diazoalkane carbene to propargylic compounds: Epoxide hydrolases from yeasts and other sources: Access to the PDF text. Houk et le Dr. Previous Article Gecom-Concoord Contact Help Who are we?

The owners of this website hereby guarantee to respect the legal confidentiality conditions, applicable in France, and not to disclose this data to third parties. Conjointement avec le Pr. Simple alkynes generate dienes via double diazoalkane carbene addition to the triple bond.

As such, this provides a straightforward approach to control chirality in 1,3-dipolar cycloaddition reactions. Catalytic addition of diazoalkane carbene to enynes: Cloning and nucleotide sequence of fosfomycin biosynthetic genes of Streptomyces wedmorensis.

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