Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Sara Ariel"'
Publikováno v:
Acta Crystallographica Section C Crystal Structure Communications. 48:400-402
C 18 H 16 O cristallise dans P2 1 /c avec a = 7,139, b = 15,823 et c = 12,472 A, β = 103,12 °, Z = 4; affinement jusqu'a R = 0,052. La structure est desordonnee avec deux conformations moleculaires (equivalentes) occupant le meme site (50:50). Le c
Publikováno v:
Molecular Crystals and Liquid Crystals. 134:169-196
The solid state photochemistry of six α-cycloalkyl-p-chloroacetophenone derivatives (cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, exo-2-norbornyl and 1-adamantyl) is reported. All six undergo smooth type II photochemistry in the crystalline pha
Autor:
Leuekn Walsh, Yiu-Fai Wong, Syed Askari, Sara Ariel, James Trotter, Chistine Hwang, Jack Jay, John R. Scheffer, Stephen V. Evans
Publikováno v:
Tetrahedron. 43:1253-1272
Steric compression, arising from intermolecular or intermolecular H...H non-bonded repulsive interactions generated along the reaction pathway, is used to explain abnomal solid state photoreactivity. Computer simulations of the motions involved in ea
Publikováno v:
Acta Crystallographica Section B Structural Science. 43:532-537
Etude des structures cristallines du tetramethyl-2,3,4a,9a tetrahydro-4a,9,9a,10 anthracenedione-1,4 et de son photoproduit tetramethyl-1,3,4,6 benzo [8,9] tricyclo [4.4.0.0 3,10 ] decene-8 dione-2,5
Publikováno v:
Tetrahedron Letters. 27:783-786
Solution phase photolysis of the Diels-Alder adduct 3 formed between o-quinodimethane and 2,3-dimethyl-1,4-naphthoquinone affords, via β-hydrogen atom abstraction and closure of the resulting 1,3-biradical, the cyclopropanol 4. The cyclopropanol its
Autor:
Yiu-Fai Wong, James Trotter, Stephen V. Evans, Christine Hwang, John R. Scheffer, Sara Ariel, Jack Jay
Publikováno v:
Tetrahedron Letters. 26:965-968
The unsymmetrical ene-dione 1b exists in solution as a mixture of two conformational isomers, A and B, in rapid equilibrium. Irradiation of 1b in this medium leads to four products, two from each conformer. In the solid state, however, compound 1b ad
Autor:
James Trotter, Sara Ariel
Publikováno v:
Acta Crystallographica Section C Crystal Structure Communications. 42:1804-1807
C20H1802, Mr=290"36, triclinic, P1, a= 9.907(3), b=12.094(4), c=13.049(4) A, ~= 80.54 (2), fl= 85.03 (2), ?= 89.73 (2) °, v= 1536.3 (8)A 3, z= 4 (two molecules per asymmetric unit), D x = 1.255 g cm -3, 2(Mo Kay) = 0.70926 A, /~ =0.71cm -~, F(000)=6
Publikováno v:
Tetrahedron Letters. 24:4555-4558
The high resolution, proton-decoupled 13C NMR spectra of several oxygenated hexalin, octalin and decalin derivatives have been obtained in solution and in the solid state (cross polarization, magic angle spinning). The results are used to deduce both
Autor:
Sara Ariel, James Trotter
Publikováno v:
Acta Crystallographica Section B Structural Science. 43:563-566
The crystal structures of two asymmetrically substituted tetrahydro-l,4-naphthoquinones have been determined and correlated with their photochemical behaviour. T=295 K, Mo Kal, h =0.70930~. (I): 6,7-Benzo-2,4a-dimethyl-cis-4a,5,8,8a-tetrahydro- 1,4-n
Autor:
James Trotter, Sara Ariel
Publikováno v:
Acta Crystallographica Section B Structural Science. 44:538-544
C 13 H 16 O 2 cristallise dans P2 1/n avec affinement jusqu'a 0,095. Calculs d'energie moleculaire pour determiner l'energie de chaque molecule conformere observee et tracer le diagrame d'energie correspondant