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Search for "ring strain" in Full Text gives 81 result(s) in Beilstein Journal of Organic Chemistry.

Reciprocal polyhedra and the Euler relationship: cage hydrocarbons, CnHn and closo-boranes [BxHx]2−

  • Michael J. McGlinchey and
  • Henning Hopf

Beilstein J. Org. Chem. 2011, 7, 222–233, doi:10.3762/bjoc.7.30

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  • associated with cyclobutadienes, steric interactions between the bulky alkyl groups destabilize the planar system. However, the formation of a molecule containing four cyclopropyl moieties clearly introduces considerable additional ring strain. [3]Prismane, C6H6, 9 Prismane derivatives bearing bulky
  • (2,6-diethylphenyl)cyclotristannne, 74, and fully characterized spectroscopically and by X-ray crystallography [46][47][48]. The major mitigating factor here is that such elements commonly form structures in which 90° angles are the norm [49], and so ring strain is no longer such a major impediment to
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Published 18 Feb 2011

β-Hydroxy carbocation intermediates in solvolyses of di- and tetra-hydronaphthalene substrates

  • Jaya S. Kudavalli and
  • Rory A. More O'Ferrall

Beilstein J. Org. Chem. 2010, 6, 1035–1042, doi:10.3762/bjoc.6.118

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  • the carbocyclic substrate in this case shows a rate retardation of 80,000 [16]. This value has been considered exceptionally large and an additional rate-retarding effect has been attributed to ring strain induced by the presence of oxygen in the six-membered ring of the bicyclic carbocation
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Published 03 Nov 2010

Molecular recognition of organic ammonium ions in solution using synthetic receptors

  • Andreas Späth and
  • Burkhard König

Beilstein J. Org. Chem. 2010, 6, No. 32, doi:10.3762/bjoc.6.32

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Published 06 Apr 2010

Ring strain and total syntheses of modified macrocycles of the isoplagiochin type

  • Andreas Speicher,
  • Timo Backes,
  • Kerstin Hesidens and
  • Jürgen Kolz

Beilstein J. Org. Chem. 2009, 5, No. 71, doi:10.3762/bjoc.5.71

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  • macrocycles. Keywords: axially chiral biaryl; isoplagiochin; macrocycle; ring strain; total synthesis; Introduction The cyclic bisbibenzyls isoplagiochin C (1) and D (2) were isolated from the liverworts Plagiochila fruticosa [1], Plagiochila deflexa [2], Herbertus sakuraii [3] and Lepidozia fauriana [4
  • conformational analysis and MD investigations clearly confirmed the biaryl axis A to be configurationally stable at room temperature due to the second (more flexible) biaryl axis B, an (even more flexible) helical stilbene unit C and their combination with the ring-strain of the entire molecule. By experimental
  • ) or even tolane bridges between the two biaryl units a–b and c–d. These structures should be more rigid with respect to the ring strain enhanced by geometrically fixed two-carbon bridges. But for ring strain considerations, the real cyclization product possessing at least additional phenolic
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Published 01 Dec 2009

Mitomycins syntheses: a recent update

  • Jean-Christophe Andrez

Beilstein J. Org. Chem. 2009, 5, No. 33, doi:10.3762/bjoc.5.33

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  • the “normal” 5-substituted isoxazoline is formed. Hence, the nitrodecene 123 gives rise to only the nine-membered carbocycle 125 upon reaction with phenyl isocyanate. The matching HOMO-LUMO interactions for such cycloadditions favour the formation of 126 but ring strain and transannular steric effects
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Published 08 Jul 2009

Dimerization of propargyl and homopropargyl 6-azido- 6-deoxy- glycosides upon 1,3-dipolar cycloaddition

  • Nikolas Pietrzik,
  • Daniel Schmollinger and
  • Thomas Ziegler

Beilstein J. Org. Chem. 2008, 4, No. 30, doi:10.3762/bjoc.4.30

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  • dimers, trimers and tetramers. α-Galactoside 4e did not give any isolable dimer 7e at all (cf. Table 1, entry 5). Similarly, α-glucoside 4c resulted in a lower yield of the corresponding dimer compared to β-glucoside 4a (cf. Table 1, entries 1 and 3). This may be attributed to a significant ring-strain
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Published 13 Aug 2008
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