Matches in SemOpenAlex for { <https://semopenalex.org/work/W1978478020> ?p ?o ?g. }
Showing items 1 to 58 of
58
with 100 items per page.
- W1978478020 endingPage "220" @default.
- W1978478020 startingPage "211" @default.
- W1978478020 abstract "The steric course of ring-opening polymerization catalysed by W(CO) 3 Cl 2 (AsPh 3 ) 2 is strongly influenced by the presence of other cyclic or linear olefins, such as cyclooctene, cyclohexene, 1-hexene and 1,7-octadiene. The blockiness of the polymer increases linearly with the overall olefin concentration in the reaction mixture. This effect of the individual olefins is independent of whether or not they participate in the cross-metathesis reaction to a detectable extent. The results are in agreement with the existence of two major kinetically-distinct propagating metallacarbene species, one cis - and one trans -directing. Terminal olefins act as chain transfer agents. Based on polymer fractionation, 13 C NMR and GC-MS studies, two more kinds of selectivity of the catalyst was found besides the increase of σ c and r c r t , of the polymer: 1. The formation, exclusively, of oligomers of a nonsymmetric structure; 2. The lack of detectable products of the homometathesis of linear chain olefins. The results are explained by the reluctance to form CH 2 carbenes and the relatively high reaction rate of propagation, chain transfer and degenerate metathesis, compared to the productive metathesis of the terminal olefins." @default.
- W1978478020 created "2016-06-24" @default.
- W1978478020 creator A5054591835 @default.
- W1978478020 creator A5067021119 @default.
- W1978478020 date "1984-08-01" @default.
- W1978478020 modified "2023-10-17" @default.
- W1978478020 title "Ring-opening polymerization of norbornene catalysed by W(CO)3Cl2(AsPh3)2 in the presence of other olefins" @default.
- W1978478020 cites W1574365099 @default.
- W1978478020 cites W1798846100 @default.
- W1978478020 cites W2005787339 @default.
- W1978478020 cites W2010692271 @default.
- W1978478020 cites W2086697258 @default.
- W1978478020 cites W2093856711 @default.
- W1978478020 cites W2317765391 @default.
- W1978478020 doi "https://doi.org/10.1016/0022-328x(84)80361-7" @default.
- W1978478020 hasPublicationYear "1984" @default.
- W1978478020 type Work @default.
- W1978478020 sameAs 1978478020 @default.
- W1978478020 citedByCount "25" @default.
- W1978478020 countsByYear W19784780202014 @default.
- W1978478020 crossrefType "journal-article" @default.
- W1978478020 hasAuthorship W1978478020A5054591835 @default.
- W1978478020 hasAuthorship W1978478020A5067021119 @default.
- W1978478020 hasConcept C178790620 @default.
- W1978478020 hasConcept C185592680 @default.
- W1978478020 hasConcept C188027245 @default.
- W1978478020 hasConcept C2780378348 @default.
- W1978478020 hasConcept C2780547246 @default.
- W1978478020 hasConcept C44228677 @default.
- W1978478020 hasConcept C521977710 @default.
- W1978478020 hasConceptScore W1978478020C178790620 @default.
- W1978478020 hasConceptScore W1978478020C185592680 @default.
- W1978478020 hasConceptScore W1978478020C188027245 @default.
- W1978478020 hasConceptScore W1978478020C2780378348 @default.
- W1978478020 hasConceptScore W1978478020C2780547246 @default.
- W1978478020 hasConceptScore W1978478020C44228677 @default.
- W1978478020 hasConceptScore W1978478020C521977710 @default.
- W1978478020 hasIssue "2" @default.
- W1978478020 hasLocation W19784780201 @default.
- W1978478020 hasOpenAccess W1978478020 @default.
- W1978478020 hasPrimaryLocation W19784780201 @default.
- W1978478020 hasRelatedWork W2025182659 @default.
- W1978478020 hasRelatedWork W2026277924 @default.
- W1978478020 hasRelatedWork W2040165481 @default.
- W1978478020 hasRelatedWork W2057703035 @default.
- W1978478020 hasRelatedWork W2059476290 @default.
- W1978478020 hasRelatedWork W2063546637 @default.
- W1978478020 hasRelatedWork W2111513589 @default.
- W1978478020 hasRelatedWork W2160309261 @default.
- W1978478020 hasRelatedWork W2351179270 @default.
- W1978478020 hasRelatedWork W2473318596 @default.
- W1978478020 hasVolume "270" @default.
- W1978478020 isParatext "false" @default.
- W1978478020 isRetracted "false" @default.
- W1978478020 magId "1978478020" @default.
- W1978478020 workType "article" @default.