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2 article(s) from Lemcoff, N. Gabriel

Thermal properties of ruthenium alkylidene-polymerized dicyclopentadiene

Yuval Vidavsky,
Yotam Navon,
Yakov Ginzburg,
Moshe Gottlieb and
N. Gabriel Lemcoff

Beilstein J. Org. Chem. 2015, 11, 1469–1474, doi:10.3762/bjoc.11.159

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Graphical Abstract

Figure 1: DCPD (1) and ruthenium benzylidene catalyst 2.

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Scheme 1: ROMP of dicyclopentadiene by a ruthenium alkylidene initiator.

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Figure 2: Top: DSC plot of PDCPD 24 hours after polymerization. Blue line: 1st heating–cooling cycle. Black l...

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Figure 3: Change in T_g for a representative PDCPD sample as a function of time.

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Figure 4: Intensity of exothermic peak as a function of rest time at room temperature for different samples.

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Figure 5: Peak intensity as function of age. Samples were analyzed every two weeks. The abnormal low intensit...

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Figure 6: Resting temperature effect. Blue columns: resting at room temperature. Orange columns: resting at −...

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Figure 7: Top: Sample after 1 week with ethyl vinyl ether. Bottom: Sample after 1 week with diethyl ether.

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Full Research Paper

Published 21 Aug 2015

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Light-induced olefin metathesis

Yuval Vidavsky and
N. Gabriel Lemcoff

Beilstein J. Org. Chem. 2010, 6, 1106–1119, doi:10.3762/bjoc.6.127

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Scheme 1: Light activated metathesis of trans-2-pentene.

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Scheme 2: Light induced generation of metathesis active species 2.

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Figure 1: Well-defined tungsten photoactive catalysts.

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Figure 2: The first ruthenium based complexes for PROMP.

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Figure 3: Cyclic strained alkenes for PROMP.

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Scheme 3: Proposed mechanism for photoactivation of sandwich complexes.

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Figure 4: Ruthenium and osmium complexes with p-cymene and phosphane ligands for PROMP.

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Figure 5: Commercially available photoactive ruthenium precatalyst.

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Figure 6: Some of the rings produced by photo-RCM.

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Scheme 4: Photopromoted ene-yne RCM by cationic allenylidene ruthenium complex 14.

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Figure 7: Dihydrofurans synthesised by photopromoted ene-yne RCM.

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Figure 8: Ruthenium complexes with p-cymene and NHC ligands.

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Scheme 5: Ruthenium NHC complexes for PROMP containing p-cymene and trifluroacetate (17, 19) or phenylisonitr...

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Figure 9: Photoactivated cationic ROMP precatalysts.

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Figure 10: Different monomers for PROMP.

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Scheme 6: Proposed mechanism for photoinitiated polymerisation by 22 and 23.

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Figure 11: Light-induced cationic catalysts for ROMP.

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Figure 12: Sulfur chelated ruthenium benzylidene pre-catalysts for olefin metathesis.

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Scheme 7: Proposed mechanism for the photoactivation of sulfur-chelated ruthenium benzylidene.

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Figure 13: Photoacid generators for photoinduced metathesis.

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Scheme 8: Synthesis of precatalysts 36 and 37.

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Scheme 9: Trapping of proposed intermediate 41.

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Figure 14: Encapsulated 39, isolated from the monomer.

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Review

Published 23 Nov 2010

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