  The 1H NMR spectra of the Strychnos alkaloids Retuline and Isoretuline, and their N-deacetyl compounds; ; Tits, Monique  et alin Bulletin de la Société Chimique de Belgique (1978), 87(8), 595-607 The 300 MHz 1H NMR spectra of the title compounds are discussed. The vicinal coupling constants 3J H2,H16 and 3J H16,H15 are about 10Hz and 4 Hz in the iso series, and about 7 Hz and 1 Hz for retuline ... [more ▼] The 300 MHz 1H NMR spectra of the title compounds are discussed. The vicinal coupling constants 3J H2,H16 and 3J H16,H15 are about 10Hz and 4 Hz in the iso series, and about 7 Hz and 1 Hz for retuline series. In isoretuline, the piperidine ring ( ring D) has a chair conformation, but in retuline a boat conformation, with C21 in the tip position, prevails. This conclusion is based on the pattern of allylic and homoallylic couplings around the double bond, and rests also on comparison with the spectrum of strychnine. Evidence is presented for a hydrogen bond between the C17 hydroxymethyl and the N1-COCH3 group in isoretuline. [less ▲] Detailed reference viewed: 27 (1 ULg) Observations sur l'action détersive des solutions de savonSpring, Walthère in Bulletin de la Société Chimique de Belgique (1910), XXIV Spring, W. Bull. soc. belg. chim. (1910), 24, 17-54; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). cf. C. A., 3, 1,599, 1613. The theories of ... [more ▼] Spring, W. Bull. soc. belg. chim. (1910), 24, 17-54; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). cf. C. A., 3, 1,599, 1613. The theories of soap solns. up to the present time, including one of his own previously outlined. Further work shows that Fe2O3, acts similarly to Cu in forming colloidal combinations, and in combining to produce an acid and a basic soap. Soap forms with Fe2O3 a more stable combination than Fe2O3 forms with various solids, particularly with cellulose. It is found that 3.10 mol. Fe2O3 are pptd. by 1 mol. soap when the hydrosol of FeO3H3 and soap 3 are used. Soap agglutinates the hydrosol of alumina as it does Fe. The rapidity in both cases depends upon the proportions of material mixed as well as on other factors not yet so well defined. Solns. of soap with H3SiO3, clay and cellulose behave as lampblack. The experiments show that the detergent action of soap solns. is due to the formation of a combination of adsorption with the material to be removed, the combination having lost to a great extent the adhesive power possessed by the materials before their combination. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲] Detailed reference viewed: 26 (3 ULg)Quelques remarques au sujet du travail de M. A. Reychler sur l'électrophorèse du noir de fuméeSpring, Walthère in Bulletin de la Société Chimique de Belgique (1910), XXIV(11), 416-420 Detailed reference viewed: 10 (3 ULg)Sur la couleur du glycol éthylénique et de la glycérineSpring, Walthère in Bulletin de la Société Chimique de Belgique (1908), XXII(1), 10-17 Detailed reference viewed: 13 (1 ULg)Sur les modifications subies par quelques phosphates acides à la suite d'une compression ou d'une déformation mécaniqueSpring, Walthère in Bulletin de la Société Chimique de Belgique (1907), XXI(3), 91-103 Detailed reference viewed: 3 (1 ULg)Sur la densité et l'état allotropique de certaines variétés de soufre : Remarque sur la détermination de la densité des corps en poudre fineSpring, Walthère in Bulletin de la société chimique de Belgique (1907), XXI(7), 243-257 Detailed reference viewed: 5 (1 ULg) |
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