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18/12/2017 · Request (PDF) | Ring‐Closing Metathe..

AB - The tandem dienyne ring-closing metathesis of alkynyl silaketals containing two tethered olefins was achieved with second generation Grubbs NHC-ruthenium carbene complex to provide bicyclic siloxanes in good to excellent yield. Silaketals synthesized from homoallylic or bishomoallylic alcohols via base-catalyzed alcoholysis of trialkynylsilanes were well tolerated in the metathesis process and generated ring systems of various sizes. Removal of the silicon tether was achieved through protodesilylation with fluoride to afford stereochemically defined (1E,3Z)-dienes.

T1 - Catalytic Ring-Closing Metathesis of Functionalized Dienes by a Ruthenium Carbene Complex

AB - Relay the catalyst! A concise synthesis of the naturally occurring inhibitor of ubiquitin-activating enzyme (+)-pane- pophenanthrin has been achieved. The synthesis features a relay metathesis-induced enyne-ring-closing metathesis followed by cross-metathesis to form a pivotal intermediate. Several step manipulations of this intermediate afforded a putative biomimetic Diels-Alder reaction substrate that induced a spontaneous dimerization, thereby providing (+)-panepophenanthrin.

it is called ring-closing enyne metathesis or ..

A Triazole-Templated Ring-Closing Metathesis for Constructing Novel Fused and Bridged Triazoles.

The tandem dienyne ring-closing metathesis of alkynyl silaketals containing two tethered olefins was achieved with second generation Grubbs NHC-ruthenium carbene complex to provide bicyclic siloxanes in good to excellent yield. Silaketals synthesized from homoallylic or bishomoallylic alcohols via base-catalyzed alcoholysis of trialkynylsilanes were well tolerated in the metathesis process and generated ring systems of various sizes. Removal of the silicon tether was achieved through protodesilylation with fluoride to afford stereochemically defined (1E,3Z)-dienes.

N2 - The tandem dienyne ring-closing metathesis of alkynyl silaketals containing two tethered olefins was achieved with second generation Grubbs NHC-ruthenium carbene complex to provide bicyclic siloxanes in good to excellent yield. Silaketals synthesized from homoallylic or bishomoallylic alcohols via base-catalyzed alcoholysis of trialkynylsilanes were well tolerated in the metathesis process and generated ring systems of various sizes. Removal of the silicon tether was achieved through protodesilylation with fluoride to afford stereochemically defined (1E,3Z)-dienes.

ChemSpider SyntheticPages | Ring closing metathesis of a diene

The synthesis features a relay metathesis-induced enyne-ring-closing metathesis followed by cross-metathesis to form a pivotal intermediate.

Relay the catalyst! A concise synthesis of the naturally occurring inhibitor of ubiquitin-activating enzyme (+)-pane- pophenanthrin has been achieved. The synthesis features a relay metathesis-induced enyne-ring-closing metathesis followed by cross-metathesis to form a pivotal intermediate. Several step manipulations of this intermediate afforded a putative biomimetic Diels-Alder reaction substrate that induced a spontaneous dimerization, thereby providing (+)-panepophenanthrin.

N2 - Relay the catalyst! A concise synthesis of the naturally occurring inhibitor of ubiquitin-activating enzyme (+)-pane- pophenanthrin has been achieved. The synthesis features a relay metathesis-induced enyne-ring-closing metathesis followed by cross-metathesis to form a pivotal intermediate. Several step manipulations of this intermediate afforded a putative biomimetic Diels-Alder reaction substrate that induced a spontaneous dimerization, thereby providing (+)-panepophenanthrin.

The synthesis features a relay metathesis-induced enyne-ring-closing metathesis followed ..
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Solvents for ring-closing metathesis reactions - …

Ru(II)-Catalyzed Ring Closing Metathesis in Stereoselective Spiroannulations and Cascade Reactions of Cyclic Dipeptide Substrates,"
Undheim, K.; Efskind, J. 2000, , 4847-57.

Phillips, A. J.; Abell, A. D. 1999, , 75-89.

Grubbs, R. H.; Miller, S. J.; Fu, G. C. 1995, , 446-52.

Martin, S. F. 2005, , 1207-12.

Deiters, A.; Martin, S. F. 2004, , 2199-238.

05/10/2005 · Ring-closing metathesis, ..

Secondary metathesis reactions (controlled by catalyst choice and reaction conditions) also affect the product distribution. Recoordination of an alkene on the growing polymer chain with the catalyst can lead to cyclic oligomers through a ring-closing metathesis reaction (“backbiting”). Chain transfer (cross metathesis) between a growing polymer unit and an adjacent polymer alkene also leads to broadened molecular weights. Chain transfer can also be used to improve processability of the resulting polymer – addition of an acyclic olefin (chain-transfer agent) can limit chain molecular weights and introduce terminal functional groups.

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