Topic
Norbornene
About: Norbornene is a research topic. Over the lifetime, 5628 publications have been published within this topic receiving 104495 citations. The topic is also known as: norbornylene & norcamphene.
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TL;DR: In situ generated cationic (η3-substituted allyl) palladium N-heterocyclic carbene (NHC) complexes are air-stable active catalysts for the olefin polymerization of (bicyclo[2.2.1]hept-5-en-2-yl)methyl acetate (5-norbornene-2]-acetate (endo:exo = 7:3) as mentioned in this paper.
35 citations
TL;DR: Viscometric measurements, in varied conditions, were performed with commercial and synthesized samples of cyclic olefin copolymers (COC) based on ethylene and norbornene as discussed by the authors.
35 citations
Patent•
17 Jun 1981
TL;DR: Mannich bases of hindered aromatic alcohols are incorporated in polymeric norbornene materials to improve their resistance to oxidation as mentioned in this paper, and the Mannich bases are used to improve the robustness of the polymeric materials to oxidation.
Abstract: Mannich bases of hindered aromatic alcohols are incorporated in polymeric norbornene materials to improve their resistance to oxidation.
35 citations
TL;DR: An improved synthetic procedure for the complex (SPY-5-34)-dichloro-(κ 2 (C,P)-diphenyl-(2-benzylidene)-phosphine)-(1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydro-imidazol-2-ylidsene)-ruthenium ( 2 ) was elaborated and the title compound was tested as latent initiator in Ring Opening Metathesis Polymerization (ROMP) and as
35 citations
TL;DR: The thermally labile 5 was shown to undergo a retro-Diels-Alder reaction that produces S(2)O and 3 in a reversible way, and DFT calculations at the B3LYP/6-311+G(3df,2p) level were carried out in order to explain why S( 2)O disproportionates to SO(2).
Abstract: 5,6-Di-tert-butyl-2,3,7-trithiabicyclo[2.2.1]hept-5-ene 7-endo-oxide (4) was prepared by addition of S2Cl2 to 3,4-di-tert-butylthiophene 1-oxide (3) in high yield. The oxidation of 4 with dimethyldioxirane gave a 7:1 isomeric mixture of 5,6-di-tert-butyl-2,3,7-trithiabicyclo[2.2.1]hept-5-ene 2-endo-7-endo-dioxide (5a) and 2-exo-7-endo-dioxide (5b) quantitatively. The thermally labile 5 was shown to undergo a retro-Diels−Alder reaction that produces S2O and 3 in a reversible way. The resulting S2O was trapped by Diels−Alder reactions with dienes to give 3,6-dihydro-1,2-dithiin 1-oxides in good yields. In the absence of the dienes, S2O disproportionates to SO2 and S3, and the resulting S3 underwent a 1,3-dipolar cycloaddition with 3 on its syn-π-face with respect to the SO bond to give a trithiolane derivative, whereas in the presence of excess norbornene, it produced the 1,3-dipolar cycloadduct with norbornene in good yield. Thus, the retro-Diels−Alder reaction of 5 functions as an S2O and S3 source. DFT c...
35 citations