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 this paper, a 157 nm resist polymers with hexafluoroisopropanol as an acid group and an α-trifluoromethylacrylic moiety as a repeat unit of the polymers is presented.
Abstract: For adequate transparency we have selected hexafluoroisopropanol as an acid group and an α-trifluoromethylacrylic moiety as a repeat unit of our 157 nm resist polymers. The hexafluoroalcohol group is bound to norbornene or styrene. Four platforms are currently available to us: (1) all-acrylic, (2) all-alicyclic, (3) acrylic-alicyclic, and (4) acrylic-aromatic systems. While the all-alicyclic (all-norbornene) polymers are synthesized by transition-metal-initiated addition polymerization, all other polymers involving α-trifluoromethylacrylic monomers are prepared by conventional radical copolymerization. Characterization of the polymers and preliminary lithographic evaluation are reported.
38 citations
TL;DR: The novel pyridazine derivatives (8, 9) efficiently inhibited the cytosolic human carbonic anhydrase isoenzymes I and II and were evaluated for their in vitro acetylcholinesterase inhibitory activity.
38 citations
TL;DR: The long-term stability and solution characterization of these polymers are dramatically influenced by ligand-exchange reactions within the boronate moiety, as demonstrated in the ROMP polymerization of norbornene monomers with borons both in exo and endo positions.
Abstract: Molybdenum and ruthenium catalysis has been used to synthesize main-chain boronate ADMET polymers under bulk conditions; however, the long-term stability and solution characterization of these polymers are dramatically influenced by ligand-exchange reactions within the boronate moiety. Placing the boronate pendent to the main chain obviates this phenomenon as demonstrated in the ROMP polymerization of norbornene monomers with boronates both in exo and endo positions. The stereochemistry of the monomer influences both the rate of polymerization and the microstructure of the resulting polymer; these effects are more pronounced in the case of ruthenium catalysis. The thermal stability of these polymers also is dependent upon monomer stereochemistry.
38 citations
TL;DR: The reaction of substituted (difluoroiodo)arenes with 1-phenyl-1-(m-chlorophenyl)ethylene results in 1,1-diffluoro-1-mchlorphenyl)2-phenylethane as mentioned in this paper.
Abstract: The reaction of substituted (difluoroiodo)arenes with 1-phenyl-1-(m-chlorophenyl)ethylene results in 1,1-difluoro-1-(m-chlorophenyl)2-phenylethane, with 1-phenyl-1-(p-methoxyphenyl)ethylene in 1,1-difluoro-1-phenyl-2-(p-methoxyphenyl) ethane, and with 1-phenylcyclopentene and 1-phenylcyclohexene in rearranged gem-difluoro compounds. The reaction with norbornene results in three products: fluoronortricyclane (9–12%), 2-exo-7-syn-difluoronorbornane (75–86%), and 2-exo-7-anti-difluoronorbornane (5–15%) depending upon the substituent on the phenyl ring in (difluoroiodo)arenes.
38 citations
TL;DR: The reaction of [Cp[sup *]RuCl][sub 4] with 1,1-diphenylcyclopropene (1) gives the bridging vinyl carbene complex [C p[sup*]RuCL][sub 2][double bond]CHCH[double bond]-CPh[sub 2] (4) in moderate yield as mentioned in this paper.
38 citations