Journal ArticleDOI
Analyse conformationnelle et dichroïque d'α-cyclopropylcétones aliphatiques perturbées dans des octants de front
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In this paper, a nouvelle regle "anti-octants" is defined, construite sur les deux plans de symetrie classiques du chromophore carbonyle (le plan des liaisons σ and le plan des orbitales π qui lui est perpendiculaire).About:
This article is published in Tetrahedron.The article was published on 1972-01-01. It has received 17 citations till now.read more
Citations
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The synthesis of 13,14-dihydro-13,14-methylene-PGF2α and PGE2
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Effect of the substituents on the diastereoselectivity in the reduction of cyclopropyl ketones
TL;DR: In this paper, the reduction of cyclopropyl ketones with hydride reagents was studied and high diastereoselectivities (15 to 20 : 1) were obtained with cis-cyclopropyl-ketones, while virtually no facial selectivity was observed for the trans-analogues.
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The unusual 1,4-chelation-controlled nucleophilic addition to aldehydes with high stereoselectivity. A systematic study of stereoselectivity in the addition reaction of carbon nucleophiles to cis -substituted cyclopropanecarbaldehydes
TL;DR: In this article, the addition reaction of carbon nucleophiles to cis-substituted cyclopropanecarbaldehydes was systematically investigated, and it occurred via an unusual 7-membered 1,4-chelation-controlled pathway.
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Synthesis of an advanced forskolin intermediate
TL;DR: The 8,13-epoxylabdane derivative rac-19 was prepared in eight steps commencing from (E,E)-farnesol (8), and key reactions were the formation of 7 from drimenal (9b) and 6, Sharpless I epoxidation (7→11), epoxy alcohol oxidation (11→16), reductive epoxide cleavage (16→15), peracid epoxification (15→18), and the trimethylsilyl triflate mediated conversion of 18 into 19.
References
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Approximate Self‐Consistent Molecular‐Orbital Theory. V. Intermediate Neglect of Differential Overlap
TL;DR: The Intermediate Neglect of Differential Overlap (INDO) method proposed in this article is an improvement over the CNDO method, in that atomic term-level splittings and unpaired spin distributions are better accommodated.
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Structure and the Optical Rotatory Dispersion of Saturated Ketones
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Circulardichroismus—VIII : Modifizierung der octantenregel für α,β-ungesättigte ketone: theorie☆
TL;DR: In this paper, the authors present a Beziehung zwischen dem Schraubungssinn des Chromophors and dem Vorzeichen des Circulardichroismus abgeleitet.
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Electron Correlation Models for Optical Activity
E. G. Höhn,O. E. Weigang +1 more
TL;DR: In this paper, a two-system no-overlap model for rotatory strength is developed for electric-dipole forbidden as well as allowed transitions, and electron correlation terms are developed in full detail for an (1A2←1A1(C2υ) transition of a chromophore interacting with a nonpolar anisotropic perturber.
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Symmetry rules for optical rotation
TL;DR: In this paper, it was shown that to produce optical rotation in a chromophore, a potential function must have the symmetry properties of a pseudoscalar in the symmetry group of the unperturbed chromophores.