Zobrazeno 1 - 10 of 432 pro vyhledávání: '"Ernst D. Bergmann"'
1
Reaction products of primary β-hydroxy-amines with carbonyl compounds. II. Molecular refraction and infrared spectrum
Autor: Emanuel Zimkin, Ernst D. Bergmann, S. Pinchas
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 71:168-191
(1) The condensation of a number of carbonyl compounds with ethanolamine and with amino-alcohols having a tertiary hydroxy- and a primary amino-group, has been studied. The molecular refraction and the infrared spectrum have been used to distinguish
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a6c00be1cba7d30f572493f094ce7316
https://doi.org/10.1002/recl.19520710209
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2
Reaction products of primary β-hydroxy-amines with carbonyl compounds. V. The dipole moments of 1,3-dihetero-substituted 5-membered ring systems and some related problems
Autor: Ernst Fischer, Ernst D. Bergmann, Emanuel Zimkin, S. Pinchas
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 71:213-228
The dipole moments have been determined for eleven 1,3-dioxolanes, four oxazolidines and two isomeric Schiff's bases, and four imidazolidines. The influence of the molecular structure of the substances on these moments has been discussed. Certain ano
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a5601437ccfd6286817e8424caae754e
https://doi.org/10.1002/recl.19520710302
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3
Reaction products of primary β-hydroxy-amines with carbonyl compounds. VII. Oxazolidines derived from N-methylethanolamine
Autor: Ernst D. Bergmann, Emanuel Zimkin, S. Pinchas
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 71:237-242
N-Phenylethanolamine condensed easily with aldehydes to give substituted oxazolidine. No reaction could be achieved with ketones. The molecular refraction and the infrared and ultraviolet spectra of the substances were measured. Critical evaluation o
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d8b24cbb2a5cb0b8eb70cc2fe8d6a695
https://doi.org/10.1002/recl.19520710304
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4
Reaction products of primary β-hydroxy-amines with carbonyl compounds. III. Ultraviolet spectra
Autor: S. Pinchas, Yehuda Hirshberg, Emanuel Zimkin, Ernst D. Bergmann
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 71:192-199
For a number of products of the condensation between ethanolamine or 2-amino-3-methyl-butanol-3 and aromatic aldehydes and ketones. the ultraviolet spectrum has been measured. The observations have been used to distinguish between oxazolidine and Sch
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b409559e6b43faae2e932169d1e20bcf
https://doi.org/10.1002/recl.19520710210
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5
Reaction products of primary β-hydroxy-amines with carbonyl compounds. IV. Infrared and ultraviolet absorption spectra of ethylenediamine derivatives
Autor: E. Meeron, Ernst D. Bergmann, Yehuda Hirshberg, S. Pinchas
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 71:200-212
(1)Eight ketones and p-chlorobenzaldehyde have been condensed with ethylenediamine. Only cyclohexanone and its methyl-derivatives give imidazolidines; in all other cases, double Schiff's bases are formed. The assignment of structures is based on the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::904767815dd68ba7f080aa66736321d6
https://doi.org/10.1002/recl.19520710211
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6
Reaction products of primary β-hydroxyamines with carbonyl compounds. XIII. Condensation of Primary β-Mercaptoamines with Carbonyl Compounds
Autor: Ernst D. Bergmann, A. Kaluszyner
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 78:289-314
2-Mercaptoethylamine and 2-amino-3-mercaptobutane have been condensed with various carbonyl compounds. The structure of 14 of these condensation products has been studied by physical methods (molecular refraction, infrared spectrum, ultraviolet spect
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8a5e273417e38c8cba203f1e5e696080
https://doi.org/10.1002/recl.19590780410
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8
Reaction products of primary β-hydroxy-amines with carbonyl compounds. I. The infrared absorption of acetals and ketals
Autor: Ernst D. Bergmann, S. Pinchas
Publikováno v: Recueil des Travaux Chimiques des Pays-Bas. 71:161-167
The infrared absorption curves of 18 acetals and ketals have been measured in the region 1070–1190 cm−1. The C—O—C band at 1130 cm−1 (ethers) is split in the case of acetals and ketals (C-O-C-O-C) into three branches: at 1158—1190 cm−1
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f357e5afaa25c1b4b16fd97f1daa6ba6
https://doi.org/10.1002/recl.19520710208
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10
Tautomeric forms of purines resulting from proton shifts between nitrogens N7 and N9
Autor: Bernard Pullman, Ernst D. Bergmann, Hannah Weiler-Feilchenfeld, Zohar Neiman
Publikováno v: International Journal of Quantum Chemistry. 3:103-111
Measurements of the dipole moments and the electronic spectra of suitably substituted derivatives of xanthine and purine confirm the predictions, obtained by various methods of calculation, that the tautomeric forms of these two bases [N(7)H and N(9)
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c7ae0ae981ebb7080e2297b00f8a4ffc
https://doi.org/10.1002/qua.560030715
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