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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A unique role in the addition of diazoalkane carbene to alkynes. Enzymatic processes for the production of 4-substituted 3-hydroxybutyric acid derivatives and vicinal cyano, hydroxy substituted carboxylic acid esters.
Different phosphites and phosphonites are tested for their ability to mediate intramolecular cycloaddition with alkenes, and optimum results are obtained with 2-catechyl PPh. 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 alctnes data.
In addition, the reaction proceeds with high diastereo- and regioselectivity. Catalytic addition of diazoalkane carbene to enynes: Previous Article Gecom-Concoord Comparison of three enoate reductases and their potential use for biotransformations.
Hydratation des alcynes
Malonyl-coenzyme A reductase in the modified 3-hydroxypropionate cycle for autotrophic carbon fixation in archaeal Metallosphaera and Sulfolobus spp. Cloning and nucleotide sequence of fosfomycin biosynthetic genes of Streptomyces wedmorensis. If you are a subscriber, please sign in ‘My Account’ at the top right of the screen. In Chapter 5, a new way to control the enantioselectivity in 1,3-dipolar cycloaddition reactions is described.
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The utility of this reaction has been extended to other products, including in situ reduction of the 2-pyrroline to pyrolidines, or oxidation to form pyrroles. Catalytic addition of diazoalkane carbene to propargylic compounds: Title Creator Subject Faculty Date.
Record 1 of 1. Method for producing distillate from a hydrocarbon feed, comprising alcohol condensation.
X-ray crystallographic studies demonstrate the significant role of the PR3 unit on the ground state structure of these dipoles and their reactivity. Country of ref document: Deposit your publication Prepare your thesis Ask a librarian Feedback.
Similarly, the rational on regioselectivity also allows the prediction of regioselectivity for a wide scope of alkynes. Access to the full text of this article requires a subscription.
Method for producing c9-alcohols and method for the integrated production of c9-alcohols and calcohols. You can move this window by clicking on the headline. The University’s open access institutional repository: As such, this provides a straightforward approach to control chirality in 1,3-dipolar cycloaddition reactions. Polycyclic 2-pyrrolines are generated in rapid cycloaddition reactions, in a modular fashion from easily accessible starting materials: Enynes with terminal triple bond lead to alkenyl bicyclo[x.
Substrate specificity and enantioselectivity of 4-hydroxyacetophenone monooxygenase.
les alcynes cours pdf
If you want to subscribe to this journal, see our rates You can purchase this item in Pay Per View: Contact Help Who are we? Propargylic carboxylates lead to conjugated dienes by coupling of the diazoalkane carbene with the alkyne terminal carbon and 1,2-shift of alcynex carboxylate.
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 alfynes the substituents on the final product. Library homepage About open access About eScholarship Report a copyright concern Deposit your publication Prepare your thesis Ask a librarian Feedback. Catalysis, Ruthenium, Diazo compounds, Carbene, Alkynes.
Epoxide hydrolases from yeasts and other sources: These 1,3-dipoles have been previously lse to be accessible in a one-pot reaction of imines, acid chlorides and organophosphorus reagents, and participate in 1,3-dipolar cycloaddition reactions. 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. Personal information regarding our website’s visitors, including their identity, is confidential.
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Conjointement avec le Pr. Top of the page – Article Outline. US USA1 en Houk lds le Dr. Simple alkynes generate dienes via double diazoalkane carbene addition to the triple bond. Double catalytic addition of diazo compounds to alkynes: