Contemporary Ideas About the Conformations of Eight-membered Cyclic Systems with Planar Fragments

Arshinova, R. P.

doi:10.1070/rc1988v057n12abeh003417

Cited by 25 publications

(13 citation statements)

References 4 publications

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“…Concerning the packing of this molecule, the minimum intermolecular distances are C(3)-C(12) = 3.500 A and C( 24)- 1,2;5,6;9,10;13,5,9,-In C32H32 the space group is non-centrosymmetric values for 1/B and A/C pairs are very close but for the sign. Since two conformations with the same angles and opposite signs correspond to a pair of enantiomers,' ' , 1 2 , 1 9 we can conclude that only one conformation (150.2,-172.9,88.3; -105.1,171.8, 6) H( 6) O( 9) * * -H(1)0( 9) O( 9) -* * H(2)0( 9) H( 6) ---O( 9)" H( 1)0( 9) -Br H(2)0 (9) .…”

Section: Resultsmentioning

confidence: 89%

“…Br' C( 6)-H( 6) -O( 9) " 0( 9)-H( 1)0( 9) Br 0(9)-H(2)0 (9) . Br' 3.340( 6) 3.35 l(4) 3.353(4) 1.08(4) 1.07 ( 10) 0.94(7) 2.278(6) 2.329( 1 1) 2.56 1 (8) 167.1 (4) 159.5(6.9) 169. 4(6.9) a Symmetry operator, -x + 1, -y , -z + 1.…”

Section: Resultsmentioning

confidence: 99%

“…x -13, Jgauche z 7, J,,.,, z 13 ABCD, 6 , = 2.72,6, = 2.74,6, = 3.17,6, = 3.29, J,,, x -13, JgauEhe x 3, Jtrans z 14 CD,CI, + CS2 (2: 1)" 170 C6H4: [ABCD], + AA'BB', 7.17 The aromatic AA'BB' systems have been analysed and assigned using the small coupling between ortho protons [H(l), H(4), H( 7), H (10)] and the CH, protons. This coupling is also present in o-xylene; for this compound the protons of Table 6 and the carbons of Table 7 (assigned according to K a l i n o ~s k i ) , ~~ have been connected through a 2D ('H-13C) correlated spectrum.…”

Section: Resultsmentioning

confidence: 99%

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The molecular structure of 6, 8, 6 and related systems

Domiano¹,

Cozzini²,

Claramunt³

et al. 1992

J. Chem. Soc., Perkin Trans. 2

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90.00", /? = 90.38", y = 90.00", Z = 8) have been determined. The first two, which belong to the 6,8,6 ring system, exist in the solid state in the chair conformation, whereas both the chair and the boat forms are present in solution. The central twelve-membered ring of compound 12 exists in the crystal as an almost perfect C, propeller, which is also the only observed conformation in solution.Finally, there are four different molecules of compound 16 in the crystal; however, they roughly correspond to the same conformation (and its enantiomer) [(+-+,-+-,++-,---) and (-+-,+-+, --+,+ + +)I. Partial and complementary to literature NMR ('H and 13C) results agree with previous conformational analyses in solution.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The molecular structure of 6, 8, 6 and related systems

Domiano¹,

Cozzini²,

Claramunt³

et al. 1992

J. Chem. Soc., Perkin Trans. 2

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show abstract

“…The stericaUy more demanding isopropyl group and the cage phosphite moiety occupy pseudo-equatorial positions (Figs. 1 and 2) and the heterocyclic eight-membered ring exists in a boat-chair conformation (Arshinova, Danilova & Ovodova, 1986;Quin, 1988;Arshinova, 1988).…”

Section: Commentmentioning

confidence: 99%

[4,4',6,6'-Tetramethyl-(2,2'-isobutylidenedi-o-phenylene)] (2,6,7-Trioxa-1-phosphabicyclo[2.2.2]oct-4-ylmethyl) Phosphite, C25H32P2O6

Elnagar¹,

Layman²,

Fronczek³

1995

Acta Crystallogr C

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“…[8,9] Phosphorylation of 1 with triamidophosphites and other acyclic derivatives have resulted in formation of cyclic products -1,3,2-dioxaphophacines. [10][11][12] At the same time, compound 1 has never been applied as a building block in synthesis of macrocyclic systems.…”

Section: Introductionmentioning

confidence: 99%