Carotenoids and related compounds. Part 41. Structure of mytiloxanthin and synthesis of a cis-isomer

Journal of the Chemical Society Perkin Transactions 1 ◽

10.1039/p19880001383 ◽

1988 ◽

pp. 1383 ◽

Cited By ~ 11

Author(s):

Akash K. Chopra ◽

Anakshi Khare ◽

Gerard P. Moss ◽

Basil C. L. Weedon

Keyword(s):

Related Compounds ◽

Cis Isomer

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ChemInform Abstract: PROTON NMR, CARBON-13 NMR, UV AND CD SPECTRAL DATA ON SYNTHETIC (3S,3′S)-ASTAXANTHIN, ITS 15-CIS ISOMER, AND SOME RELATED COMPOUNDS

Chemischer Informationsdienst ◽

10.1002/chin.197734050 ◽

1977 ◽

Vol 8 (34) ◽

pp. no-no

Author(s):

G. ENGLERT ◽

F. KIENZLE ◽

K. NOACK

Keyword(s):

Spectral Data ◽

Proton Nmr ◽

Related Compounds ◽

Cis Isomer

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ChemInform Abstract: Carotenoids and Related Compounds. Part 41. Structure of Mytiloxanthin and Synthesis of a cis-Isomer.

ChemInform ◽

10.1002/chin.198839264 ◽

1988 ◽

Vol 19 (39) ◽

Author(s):

A. K. CHOPRA ◽

A. KHARE ◽

G. P. MOSS ◽

B. C. L. WEEDON

Keyword(s):

Related Compounds ◽

Cis Isomer

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The Structures of S4N⊖, S3N2O2 and S4N3⊖

Zeitschrift für Naturforschung B ◽

10.1515/znb-1981-0418 ◽

1981 ◽

Vol 36 (4) ◽

pp. 492-497 ◽

Cited By ~ 11

Author(s):

Rolf Gleiter ◽

Richard Bartetzko

Keyword(s):

Trans Isomer ◽

Potential Surface ◽

Mndo Method ◽

Ionization Potentials ◽

Transannular Interaction ◽

Mndo Calculations ◽

The Stability ◽

Related Compounds ◽

Cis Isomer ◽

Coulomb Attraction

Abstract Part of the potential surface of S4N⊖ has been investigated using the MNDO method. It is found that the cis-trans isomer 1b is more stable by 20-30 kJ/mol than the trans-trans isomer (1 c) and the cis-cis isomer (1 a). The stability of 1 b is traced back to stabilization of the HOMO and to a Coulomb attraction. For S3N2O2 (2) the MNDO calculations favour those isomers (2a and 2b) with two sickle-like arrangements for the same reasons. For S4N3 e (3) only one isomer (3a) is favoured due to the stabilization of the HOMO. The similarity in the transannular interaction present in 1-3 and that in trithiapentalenes and related compounds is pointed out. The PE spectrum of 2 has been reinvestigated. The first five bands can be interpreted by comparison between the measured ionization potentials and the calculated (MNDO) orbital energies.

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