2000
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Abstract: Substituted propargylic esters, resistant to complete ethylene cross-metathesis at ambient pressure, underwent cross-metathesis with ethylene at elevated pressure (4 atm) to give 2-substituted butadienes in good to excellent yields. Enantioenriched propargylic acetates, obtained through enzymatic kinetic resolution of secondary propargyl alcohols, similarly underwent ethylene metathesis with retention of stereochemistry at the chiral center.

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“…[106] Diver and Smulik later reported similar findings with terminal alkyne substrates, although a high pressure of ethylene gas (60 psi) was required to ensure smooth reactions. [107] We have used enyne metathesis to prepare pseudooligosaccharides. [108] Alkene-and alkyne-functionalized carbohydrates were coupled in the presence of 6, and then further elaborated by Diels-Alder protocols (Scheme 30).…”
Section: Intermolecular Enyne Metathesismentioning
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“…[106] Diver and Smulik later reported similar findings with terminal alkyne substrates, although a high pressure of ethylene gas (60 psi) was required to ensure smooth reactions. [107] We have used enyne metathesis to prepare pseudooligosaccharides. [108] Alkene-and alkyne-functionalized carbohydrates were coupled in the presence of 6, and then further elaborated by Diels-Alder protocols (Scheme 30).…”
Section: Intermolecular Enyne Metathesismentioning
“…[106] Diver und Smulik berichteten über ähnliche Befunde mit endständigen Alkinen, wobei die Reaktionen allerdings nur bei hohen Ethylendrücken (60 psi) glatt verliefen. [107] Wir setzten En-In-Metathesen für die Synthese von Pseudo-Oligosacchariden ein. [108] Alken-und Alkin-funktionalisierte Kohlenhydrate konnten mit Katalysator 6 gekuppelt und durch Diels-Alder-Reaktionen weiter umgesetzt werden (Schema 30).…”
Section: Intermolekulare En-in-metathesenunclassified
“…[196] Die ersten Enin-Kreuzmetathesen mit substituierten Alkenen unter Bildung acyclischer 1,3-disubstituierter Butadiensysteme wurden 1997 von der Gruppe um Blechert beschrieben. [197] Diese Prozesse sind seither vielfach angewendet und verbessert worden; [198] unter anderem wurden elegante Kaskadenreaktionen entwickelt.…”
Section: Aufsätzeunclassified