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Norbornadiene
About: Norbornadiene is a research topic. Over the lifetime, 2389 publications have been published within this topic receiving 38603 citations.
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TL;DR: In this article, trifluoromethyl (CF3)-substituted donor-acceptor norbornadiene (NBD) derivatives were synthesized and photoisomerization of CF3-NBD derivatives proceeded smoothly.
Abstract: Trifluoromethyl (CF3)-substituted donor–acceptor norbornadiene (NBD) derivatives were synthesized. The photoisomerization of CF3-NBD derivatives proceeded smoothly. The thermal stability of quadricyclane (QC) derivatives obtained from CF3-NBD derivatives was examined, and it was found that the CF3 group increased the thermal stability of the QC derivatives. Furthermore, CF3-NBD derivatives exhibited efficient fatigue resistance.
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TL;DR: In this paper, the effect of the structure, preparation procedure and pretreatment of the catalysts on their activity and selectivity in norbornadiene cycloaddition and the change in the rhodium electronic state in the course of the reaction have been studied.
Abstract: It has been shown that norbornadiene is dimerized in the presence of rhodium-containing zeolite catalysts forming hexacyclodimers, exo-endo-and endo-endo-hexacyclo[9.2.1.0 4,6 .O 3,8 . O 5,9 ]tetradec-12-enes preferentially. The effect of the structure, preparation procedure and pretreatment of the catalysts on their activity and selectivity in norbornadiene cycloaddition and the change in the rhodium electronic state in the course of the reaction have been studied.
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TL;DR: In this article, the first [4+2] cycloaddition of cyclopentadienes and 2,6-diaryl-4-phenylethynyl pyrylium salts with and without methyl groups in the 3 and 5 positions was studied.
Abstract: Norbornadiene derivatives of pyrylium salts were obtained for the first time by [4+2] cycloaddition of cyclopentadienes and 2,6-diaryl-4-phenylethynylpyrylium salts with and without methyl groups in the 3 and 5 positions. Their photochemical transformations were studied.
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TL;DR: In this paper , three N-arylmaleimide-based Pd(0) complexes were prepared and used as an initiator in conjunction with NaBPh4 for polymerization of diazoacetates.
Abstract: Three new N-arylmaleimide-based Pd(0) complexes [Pd(N-phenylmaleimide)2(2,5-norbornadiene) (1), Pd(N-2,6-difluorophenylmaleimide)2(2,5-norbornadiene) (2), and Pd(N-2,6-difluorophenylmaleimide)2(dibenzylideneacetone) (3)] were prepared and used as an initiator in conjunction with NaBPh4 [Pd(N-arylmaleimide)/NaBPh4 system] for polymerization of diazoacetates. The Pd(N-arylmaleimide)/NaBPh4 system polymerized a series of diazoacetates (ethyl, benzyl, and cyclohexyl diazoacetates) to yield polymers in moderate to good yield, particularly showing a high activity for cyclohexyl diazoacetate. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) analysis and other experimental observations revealed the incorporation of one N-arylmaleimide molecule coordinated on the Pd center into the α-chain end of the polymers obtained with the initiating system, indicating that the initiating species of the polymerization was generated by insertion of N-arylmaleimide into a Pd–Ph linkage, which was first formed by the reaction of the Pd(0) complex with NaBPh4, and that the initiating system would enable syntheses of α-chain-end-functionalized poly(alkoxycarbonylmethylene)s.
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TL;DR: In this article , triple oxidative addition reactions of [M0(styrene)(PMe3)2] with C3-symmetric star-shaped molecules containing 1-, 3-, and 5-thiophene-substituted benzene, in 1:0.3 ratio, afforded new Pd(II) and Pt(II)-trinuclear complexes in suitable yields.
Abstract: Abstract Triple oxidative addition reactions of [M0(styrene)(PMe3)2] (M = Pd/Pt) with C3-symmetric star-shaped molecules containing 1-, 3-, and 5-thiophene-substituted benzene, in 1:0.3 ratio, afforded new Pd(II) and Pt(II) trinuclear complexes in suitable yields. Analogous trinuclear complexes were formed by similar reactions of thiophenyl halide derivatives containing triazine or triphenylamine cores. Alternatively, a trinuclear Pd(II) complex was obtained by oxidative addition of a Pd(0) complex (synthesized from allyl(cyclopentadienyl) palladium(II), [(η5-C5H5)Pd(η3-C3H5)] with PEt3. Sonogashira-type coupling between trinuclear Pt(II) halides (containing C3-symmetric conjugated thiophenes) and alkynes, in the presence of cuprous halide and diethylamine, afforded alkynyl-containing trinuclear Pt(II) complexes with extended π-conjugation. Insertion reactions of organic isocyanides (CN-R) with trinuclear Pd(II) complexes yielded trinuclear Pd(II) imidoyl complexes by insertion of CN-R into Pd-carbon (thiophene) bonds. Reactions of trinuclear Pt(II) halides with Ag(OCOCF3) and NaN3 formed pseudohalogen-containing Pt(II) complexes. Graphical Abstract
1 citations