Search results for "TRIPLE"
showing 10 items of 506 documents
"Table 7" of "Measurement of the differential cross-section for the production of an isolated photon with associated jet in p anti-p collisions at s*…
2008
Ratio of the differential cross section in the region ABS(YRAP(JET)) < 0.8 and YRAP(GAMMA)*YRAP(JET) < 0 to the region ABS(YRAP(JET)) 1.5 TO 2.5 and YRAP(GAMMA)*YRAP(JET) > 0.
"Table 9" of "Measurement of the differential cross-section for the production of an isolated photon with associated jet in p anti-p collisions at s*…
2008
Ratio of the differential cross section in the region ABS(YRAP(JET)) < 0.8 and YRAP(GAMMA)*YRAP(JET) > 0 to the region ABS(YRAP(JET)) 1.5 TO 2.5 and YRAP(GAMMA)*YRAP(JET) < 0.
"Table 6" of "Measurement of the differential cross-section for the production of an isolated photon with associated jet in p anti-p collisions at s*…
2008
Ratio of the differential cross section in the region ABS(YRAP(JET)) < 0.8 and YRAP(GAMMA)*YRAP(JET) > 0 to the region ABS(YRAP(JET)) 1.5 TO 2.5 and YRAP(GAMMA)*YRAP(JET) > 0.
"Table 8" of "Measurement of the differential cross-section for the production of an isolated photon with associated jet in p anti-p collisions at s*…
2008
Ratio of the differential cross section in the region ABS(YRAP(JET)) 1.5 TO 2.5 and YRAP(GAMMA)*YRAP(JET) < 0 to the region ABS(YRAP(JET)) 1.5 TO 2.5 and YRAP(GAMMA)*YRAP(JET) > 0.
Mechanism of triplet photosensitized Diels-Alder Reaction between indoles and cyclohexadienes: theoretical support for an adiabatic pathway.
2006
Diels-Alder reactions between indoles (InHs) and 1,3-cyclohexadienes (CHDs) were achieved by using aromatic ketones as photosensitizers. For instance, irradiation of deaerated dichloromethane solutions containing benzoylthiophene (BT, 1 mM), indole (20 mM), and phellandrene (40 mM), in the presence of an acylating agent, led to the N-acetylated Diels-Alder cycloadduct in 46% yield (endo:exo ratio of 1.8:1). Energy transfer from the BT triplet to the CHD gave rise to diene dimers as byproducts. Several combinations of CHDs, InHs, and aromatic ketones were tested; the Diels-Alder reaction was found to be a general process, except when the indole nucleus was substituted at position 2 or 7 and …
Dithiametacyclophane mit Dreifachbindungen
1994
Dithiametacyclophanes with Triple Bonds Schemes 1 and 2 show the syntheses of dithia[8]metacyclo-phanes 4a-d and tetrathia[m.n]metacyclophanes 9, 10 by cyclization reactions applying the cesium effect. All these cyclophanes contain C—C triple bonds which influence the molecular dynamics; especially the halogen substituents in 4b-d obstruct the topomerization.
Synthese von 9‐Oxabicyclo[6.1.0]non‐3‐in
1987
Ausgehend von 1,5-Cyclooctadien (1) wird in einer siebenstufigen Synthese die Titelverbindung 9 gewonnen. Sie liegt in zwei Konformationen 9a und 9b vor, wobei in 9a eine starke sterische Wechselwirkung zwischen dem Sauerstoffatom und der gespannten Dreifachbindung auftritt. Zur Einfuhrung der Dreifachbindung dient die thermische Fragmentierung des 1,2,3-Selenadiazols 7. Der Strukturnachweis fur die regiospezifische Bildung von 7 wird mit 2D-NMR-Spektroskopie gefuhrt. Starting with 1,5-cyclooctadiene (1), the title compound 9 is gained in a synthesis of seven steps. 9 exists in two conformations 9a and 9b, of which 9a shows a strong interaction between the oxygen atom and the strained tripl…
1‐Oxa‐3‐cyclooctin
1990
1-Oxa-3-cyclooctyne According to an MNDO calculation, 1-oxa-cyclooctyne (13) and 1-oxa-3-cyclooctyne (14) are 8-membered heterocyclic ring systems with high steric energy (ring strain). On the basis of THF (1) and acetoacetic ester (4), a multi-step synthesis is described for 14. The triple bond is introduced in the last step by a thermal fragmentation of the 1,2,3-selenadiazole 12.
X‐ray Absorption Spectra of Cu II and Cu III Complexes of N , N ′ ‐1,2‐Phenylenebis(2‐mercapto‐2‐methylpropionamide)
2005
The X-ray absorption spectra of Cu I I and Cult complexes of N,N'-1,2-phenylenebis(2-mercapto-2-methylpropionamide) were recorded and analysed in solid phase. The EXAFS spectra of the two samples were refined with full multiple scattering path. Geometry optimisations on the Cu I I and Cu I I I complexes were performed by the B3LYP density functional method, with the 6-31G(d,p) basis set, considering different spin multiplicities. The singlet state of the Cu I I I complex was shown to be more stable than the triplet state, and a good agreement between the calculated and the corresponding experimental structure was found. Further single-point calculations on the optimised geometry were carrie…
The Iron Hydrido Complex [FeH(dppe)2]+: Solution and Solid-State Reactivity with Dinitrogen
2006
The blue compound [FeH(dppe)2]BPh4 (1) (dppe = 1,2-bis(diphenylphosphino)ethane) is investigated by optical absorption, vibrational, NMR and Mossbauer spectroscopy as well as magnetic susceptibility measurements. In the solid state, 1 is found to be paramagnetic (S=1) whereas in tetrahydrofuran (thf) solution it is diamagnetic. Importantly, 1 reacts with dinitrogen in thf solution and in the solid state to give the yellow and green dinitrogen complexes 2a and 2b, respectively, both of which have the formula [FeH(N2)(dppe)2]BPh4. Apart from their colour and optical spectroscopic properties, the dinitrogen compounds 2a and 2b also differ in their magnetic, Mossbauer and vibrational properties…