Results 251 to 260 of about 1,056,457 (311)

Kinetics of thermal interconversion between cis,cis-1,3,5-octatriene, cis,cis,cis-2,4,6-octatriene, and cis,cis,trans-2,4,6-octatriene

The Journal of Organic Chemistry, 1988
L'isomerisation entre le cis,cis,cis- et le cis,cis,trans-octatriene-2,4,6 se fait de maniere indirecte en passant par l'intermediaire cis,cis-octatriene-1,3,5 mais aussi de maniere ...
John E. Baldwin, V. Prakash Reddy
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cis,cis,cis,cis-1,2,3,4,5-Pentakis(hydroxymethyl)cyclopentane

The Journal of Organic Chemistry, 1985
Synthese du compose du titre par addition de Diels Alder de l'anhydride maleique avec le benzyloxymethyl ...
Laren M. Tolbert, J. Carlin Gregory, Carolyn P. Brock   +2 more
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The inversion of cis-transoid-cis- and cis-cisoid-cis-perhydroanthracene

Tetrahedron Letters, 1982
Abstract The factor responsible for the difference between the inversion barriers of cis-transoid-cis- and cis-cisoid-cis -perhydroanthracene were explored by molecular mechanics.
P. Vanhee, B. van de Graaf, J.M.A. Baas, D. Tavernier   +3 more
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All-cis-retinal and 7-cis,9-cis,11-cis-retinal1

Tetrahedron Letters, 1988
Abstract A modified 15 + 5 route led to 7- cis ,9- cis ,11- cis -retinonitrile in high selectivity and also a lesser amount of all- cis -retinonitrile. DIBAL reduction gave the corresponding retinal isomers. The absorption maximum 287nm of all- cis -retinal reveals the distorted nature of the chromophore.
Achla Trehan, R.S.H. Liu
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Enantioselective syntheses of cis, syn, cis- and cis, anti, cis-linear triquinanes

Tetrahedron: Asymmetry, 2008
Enantioselective syntheses of both cis, syn, cis- and cis, anti, cis-linear triquinanes, starting from the readily available (S)-campholenaldehyde, employing an RCM reaction-based cyclopentannulation strategy, are described.
Srikrishna, Adusumilli, Beeraiah, Baire
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ChemInform Abstract: CIS,CIS,CIS,CIS‐1,2,3,4,5‐PENTAKIS(HYDROXYMETHYL)CYCLOPENTANE

Chemischer Informationsdienst, 1985
AbstractDie Synthese des im Titel genannten Cyclopentans (V) gelingt durch Diels‐Alder‐Addition.
L. M. TOLBERT, J. C. GREGORY, C. P. BROCK   +2 more
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A cis,trans,cis,cis-[4.5.5.5]Fenestrane Derivative

Acta Crystallographica Section C Crystal Structure Communications, 1996
The title compound, rel-(1R,4R,7S,10R)-7-(tert-butyldimethylsilyloxy)tetracyclo [5.4.1.04,12.010,12]dodecan-2-one, C18H30O2Si, has been prepared and its structure determined. The geometry of the central C(C)4 substructure of the fenestrane skeleton shows a considerable distortion from an ideal tetra­hedral arrangement towards planarity. Values of 127.0 
M. Thommen, R. Keese, M. Förtsch
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A Substituted cis,trans,cis,cis-[4.5.5.5]Fenestrene

Acta Crystallographica Section C Crystal Structure Communications, 1996
The title compound, rel-(1S,4R,7R,9S-tetracyclo- [5.4.1.0 4,12 .0 9,12 ]dodec-10-enyl-l-acetic acid, C 14 H 18 O 2 , has been prepared and its structure elucidated. The geometry of the central C(C)4 substructure shows a considerable distortion from an ideal tetrahedral arrangement towards planarity, with two opposite bond angles of of 119.2(2) and 134 ...
J. Wang, M. Thommen, R. Keese
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Mass Spectrometry Used to Discriminate Between Cis‐Syn‐Cis and Cis‐Anti‐Cis Photoadducts

Bulletin des Sociétés Chimiques Belges, 1980
AbstractCis‐syn‐cis and cis‐anti‐cis regioisomers of tricyclo [6.2.0.02, 7] decan‐3‐ones or tricyclo [5.2.0.02, 6nonan‐3‐ones, formed by (π2 +π2) photocycloaddition reactions between 1, 2‐bis (trimethylsiloxy) cyclobutene and 2‐cyclohexenones or 2‐cyclopentenones, respectively, are unequivocally identified by analysis of the isobutane chemical ...
Martine Van Audenhove, Denis De Keukeleire, Maurits Vandewalle   +2 more
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cis,cis,cis-Tetramethyl 1,2,4,5-cyclohexanetetracarboxylate

Acta Crystallographica Section C Crystal Structure Communications, 2000
The title compound, C(14)H(20)O(8), was synthesized from the hydrogenation of tetramethyl 1,4-cyclohexadiene-1,2,4, 5-tetracarboxylate with a catalytic amount of palladium/carbon. All four carbonyl moieties of the methyl ester groups are on the same face of the chair-conformed ring.
, Robinson, , Hua, , Fan, , Liu, , McGill, , Arshid, , Meyers   +6 more
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