Results 251 to 260 of about 1,695,888 (310)
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cis,cis,cis-Tetramethyl 1,2,4,5-cyclohexanetetracarboxylate
Acta Crystallographica Section C Crystal Structure Communications, 2000The 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 +6 more
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All-cis-retinal and 7-cis,9-cis,11-cis-retinal1
Tetrahedron Letters, 1988Abstract 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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The inversion of cis-transoid-cis- and cis-cisoid-cis-perhydroanthracene
Tetrahedron Letters, 1982Abstract 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 +3 more
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A cis,trans,cis,cis-[4.5.5.5]Fenestrane Derivative
Acta Crystallographica Section C Crystal Structure Communications, 1996The 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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Enantioselective syntheses of cis, syn, cis- and cis, anti, cis-linear triquinanes
Tetrahedron: Asymmetry, 2008Enantioselective 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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A Substituted cis,trans,cis,cis-[4.5.5.5]Fenestrene
Acta Crystallographica Section C Crystal Structure Communications, 1996The 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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iCI: Iterative CI toward full CI
Journal of Chemical Theory and Computation, 2016It is shown both theoretically and numerically that the minimal multireference configuration interaction (CI) approach [Liu, W.; Hoffmann, M. R. Theor. Chem. Acc. 2014, 133, 1481] converges quickly and monotonically from above to full CI by updating the primary, external, and secondary states that describe the respective static, dynamic, and again ...
Wenjian, Liu, Mark R, Hoffmann
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ChemInform Abstract: DARST. UND ISOLIERUNG DES CIS,CIS,CIS,CIS‐CYCLONONATETRAENS‐(1,3,5,7)
Chemischer Informationsdienst. Organische Chemie, 1970AbstractDie Darstellung der Titelverbindung (II) erfolgt aus dem Ion (I) mit Eiswasser bei 0°C. Mit Methyljodid entsteht aus (I) das Methylderivat (III).
PHILLIP RADLICK, GARY ALFORD
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2021
Negli spazi del padiglione Venezia Michele De Lucchi con il suo AMDL Circle ha allestito la mostra Education Stations: Sapere come usare il sapere, proponendo una specifica declinazione del programma Earth Station, già avviato dal 2018; la proposta è illustrata da un repertorio di modelli concettuali e di progetto, da un’ampia quadreria che raccoglie
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Negli spazi del padiglione Venezia Michele De Lucchi con il suo AMDL Circle ha allestito la mostra Education Stations: Sapere come usare il sapere, proponendo una specifica declinazione del programma Earth Station, già avviato dal 2018; la proposta è illustrata da un repertorio di modelli concettuali e di progetto, da un’ampia quadreria che raccoglie
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Mass Spectrometry Used to Discriminate Between Cis‐Syn‐Cis and Cis‐Anti‐Cis Photoadducts
Bulletin des Sociétés Chimiques Belges, 1980AbstractCis‐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 +2 more
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