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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Enynes with terminal triple bond lead to alkenyl bicyclo[x. Access to the text HTML. Outline Masquer le plan. Catalytic addition of diazoalkane carbene to enynes: Enzymatic processes for the production of 4-substituted 3-hydroxybutyric acid derivatives and vicinal cyano, hydroxy substituted carboxylic acid esters.
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All items in eScholarship McGill are protected by copyright with all rights reserved unless otherwise indicated. In addition, the reaction proceeds with high diastereo- and regioselectivity. Title Creator Subject Faculty Date. EP Kind code of ref document: Comparison of three enoate reductases and their potential use for biotransformations.
Simple alkynes generate dienes via double diazoalkane carbene addition to the triple bond. Journal page Archives Contents list. Previous Article Gecom-Concoord 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.
Catalytic addition of diazoalkane carbene to propargylic compounds: Record 1 of 1. Deposit your publication Prepare your thesis Ask a librarian Feedback. US USA1 en As such, this provides a straightforward approach to control chirality in 1,3-dipolar cycloaddition reactions.
Top of the page – Article Outline. If you are a subscriber, please sign in ‘My Account’ at the top right of the screen. In addition, the results of the theoretical investigation of Chapter 2 are exploited to show how changes in the phosphorus substituents can be used to fine tune regioselectivity of alkyne cycloadditions without modifying the substituents on the final product.
Molecular characterization of genes of Pseudomonas sp. The University’s open access institutional repository: Short chain volatile isoprene hydrocarbon production using the mevalonic acid pathway in genetically engineered yeast and fungi. Polycyclic 2-pyrrolines are generated in rapid cycloaddition reactions, in a modular fashion from easily accessible starting materials: Similarly, the rational on regioselectivity also allows the prediction of regioselectivity for a wide scope of alkynes.
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Conjointement avec le Pr. Applications of new phosphorus-based 1,3-dipolar cycloaddition reagents in nitrogen heterocycle synthesis.
Library homepage About open access About eScholarship Report a copyright concern. 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. X-ray crystallographic studies demonstrate the significant role of the PR3 unit on the ground state structure of these dipoles and their reactivity.
Different phosphites and phosphonites are tested for their ability to mediate intramolecular cycloaddition with alkenes, and optimum results are obtained with 2-catechyl PPh.
Double catalytic addition of diazo compounds to alkynes: Propargylic carboxylates lead to conjugated dienes by coupling of the diazoalkane carbene with the alkyne terminal carbon and 1,2-shift of the carboxylate. You can move this window by clicking on the headline.
Malonyl-coenzyme A led in the modified 3-hydroxypropionate cycle for autotrophic carbon fixation in archaeal Metallosphaera and Sulfolobus spp. Substrate specificity and enantioselectivity of 4-hydroxyacetophenone monooxygenase.
Access to the PDF text. Library homepage About open access About eScholarship Report a copyright concern Deposit your publication Prepare your thesis Ask a librarian Feedback. In conjunction with Prof.
A unique role in the addition of diazoalkane carbene to alkynes. Method for producing distillate from a hydrocarbon feed, comprising alcohol condensation. Epoxide hydrolases from yeasts and other sources: Contact Help Who are we? Catalysis, Ruthenium, Diazo compounds, Carbene, Alkynes. Catalysts for partial oxidation of hydrocarbons and method of partial oxidation of hydrocarbons.
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. 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.
Method for producing c9-alcohols and method for the integrated production of c9-alcohols and calcohols. In Chapter 5, a new way to control the enantioselectivity in 1,3-dipolar cycloaddition reactions is described. Personal information regarding our website’s visitors, including their identity, is confidential. 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.