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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 paper, a kinetic investigation of the selective hydrogenation of 2,5-norbornadiene to norbornene catalyzed by [Rh(NBD)(PPh 3 ) 2 ]BF 4 (1 ) has been carried out in dichloromethane at room temperature.
19 citations
TL;DR: The lithiocarbyne (Tp*=hydrotris(3,5-dimethylpyrazol-1-yl)borate) reacts with [PtCl2 (L2 )] to furnish ditungsten ethanediylidyne complexes, which are displaced by monodentate CO or isocyanide ligands to provide derivatives where both W≡C bonds coordinate to a single Pt0 center.
Abstract: The lithiocarbyne [W(≡CLi)(CO)2 (Tp*)] (Tp*=hydrotris(3,5-dimethylpyrazol-1-yl)borate) reacts with [PtCl2 (L2 )] (L2 =1,5-cyclo-octadiene, norbornadiene) to furnish ditungsten ethanediylidyne complexes, [W2 {μ-C2 Pt(L2 )}(CO)4 (Tp*)2 ], wherein a trigonal platinum(0) center unsymmetrically ligates one W≡C bond in the solid state but rapidly shimmies between the two W≡C bonds in solution. The η4 -dienes are displaced by monodentate CO or isocyanide ligands to provide derivatives where both W≡C bonds coordinate to a single Pt0 center, attended by significant distortion of the WCCW spine.
19 citations
TL;DR: The tetrasulfido complexes [MoS4]2-, [WS4] 2-, [VS4]3-, and [ReS4]- photolyze in solution in the presence of air according to the stoichiometry [MS4]n- + 02 -> [M02S2]n + S2] as discussed by the authors.
Abstract: The tetrasulfido complexes [MoS4]2-, [WS4]2-, [VS4]3-, and [ReS4]- photolyze in solution in the presence of air according to the stoichiometry [MS4]n- + 02 -> [M02S2]n- + S2. The diatomic sulfur can be scavenged by norbornadiene or tetramerizes to yield stable S8. Quantum yields are strongly wavelength-dependent. For all complexes the reactive excited states are of the ligand to metal charge transfer type.
19 citations
TL;DR: In this paper, the transition state in the interconversion between norbornadiene (N) and quadricyclane (Q) radical cations was analyzed at the UHF and UMP2 levels of theory and the IRC calculation showed that TS + · 1 is the true transition state connecting N+· and Q+·.
Abstract: Geometry optimizations at the UHF/6-31G* and UMP2/6-31G* levels of theory were performed to find the transition state in the interconversion between norbornadiene (N) and quadricyclane (Q) radical cations. Two transition structures, TS + · 1 and TS + · 2 , were obtained which have C1 and C2 symmetry, respectively. Vibrational analysis at the UHF and UMP2 levels of theory and IRC calculation showed that TS + · 1 is the true transition state connecting N+· and Q+·, while TS + · 2 is a second order saddle point.
19 citations
TL;DR: The polymers bearing pendant epoxide groups with 3-phenyl-2,5-norbornadiene-2-carboxylic acid (PNBC), 3-[phenyl) carbamoyl]-2, 5-norborneadiene (NBD), and 3-[(4-methoxyphenyl)carbamoyyl]-2-5-nordicene (2-CARB) acid using tetrabutylammonium bromide as a catalyst in DMF were synthesized in this paper.
Abstract: Polymers bearing photoresponsive norbornadiene (NBD) moieties were synthesized by the addition reaction of poly(glycidyl methacrylate-co-methyl methacrylate)s containing pendant epoxide groups with 3-phenyl-2,5-norbornadiene-2-carboxylic acid (PNBC), 3-[(phenyl)carbamoyl]-2,5-norbornadiene-2-carboxylic acid 3-[(4-acetylphenyl) carbamoyl]-2,5-norbornadiene-2-carboxylic acid (APCND), and 3-[(4-methoxyphenyl)carbamoyl]-2,5-norbornadiene-2-carboxylic acid using tetrabutylammonium bromide as a catalyst in DMF. The polymers bearing pendant PNBC or APCND moieties have higher photochemical reactivity in the film state than the polymers bearing pendant PCND or MPCND moieties. Although the pendant quadricyclane (QC) group produced by the photoirradiation of the PNBC moiety in these polymers has excellent storage stability in the film state, without catalyst at room temperature, the QC group in the polymer film with the catalyst reverts gradually to the NBD moiety at room temperature. © 1993 John Wiley & Sons, Inc.
19 citations