Zobrazeno 1 - 10
of 222
pro vyhledávání: '"Albrecht Mannschreck"'
Publikováno v:
CHIMIA, Vol 44, Iss 10 (1990)
As a first case in the field of spirochromenes, the energy barrier for thermally reversible ring opening of 2,2'-spirobichromenes (Scheme) is measured by racemization of preparatively enriched enantiomers. In addition, this barrier is estimated via r
Externí odkaz:
https://doaj.org/article/2dc0ac659cea448e9001e293beda7b9d
Publikováno v:
Journal of Chemical Education. 88:1501-1506
A few odorous compounds found in roses are chosen to arouse the reader's interest in their molecular structures. This article differs from some similar reports on odorants mainly by combining the structural description with the presentation of the fo
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 115:125-132
The title compounds (Scheme 1, Y = NMe2) were investigated by variable-temperature NMR and/or by racemization of enantiomers enriched by liquid chromatography on microcrystalline triacetylcellulose. For several reasons, a dialkylamino and a dimethylc
Autor:
Albrecht Mannschreck, Philip Kraft
Publikováno v:
Journal of Chemical Education. 87:598-603
This article discusses seven chiral odorants that demonstrate the enantioselectivity of odor sensation: carvone, Celery Ketone, camphor, Florhydral, 3-methyl-3-sulfanylhexan-1-ol, muscone, and methyl jasmonate. After a general introduction of the odo
Autor:
Albrecht Mannschreck, Miroslav Holík
Publikováno v:
Chemometrics and Intelligent Laboratory Systems. 72:153-160
Enantiomeric excess can be determined from overlapping liquid chromatography peaks when a dual detector, e.g., UV/vis and circular dichroism (CD), is used. Two literature methods for the determination of the sensitivity factor, g, were analyzed and t
Publikováno v:
Chirality. 15:S40-S49
The peaks of enantiomers in liquid chromatography (LC) frequently overlap for different reasons. The experimental curve can be deconvolved, i.e., transformed into the two curves of the enantiomers, without any assumption concerning their peak shapes.
Publikováno v:
Tetrahedron: Asymmetry. 12:3333-3342
The reaction of the title compounds and the transformations of the product, 3 were investigated with an emphasis on the stereochemistry. The primary interaction of the title compounds is feebly stereoselective. The diastereoisomers of product 3 exhib
Publikováno v:
Journal of Chromatography A. 909:147-154
The rotation angle/absorbance ratios C + = α + / A + and C − = α − / A − , determined via detection by a polarimeter and a photometer, were checked for the first time with reference to their use for on-line analysis during preparative separat
Autor:
Albrecht Mannschreck
Publikováno v:
Nachrichten aus Chemie und Technik. 23:295-297
Publikováno v:
Monatshefte für Chemie/Chemical Monthly. 131:1083-1090
The enantiomers of substituted spiro[cyclohexadiene-dihydroacridines] were separated by enantioselective liquid chromatography with the sorbent/solvent systems triacetylcellulose/methanol, tris-(3,5-dimethylphenylcarbamoyl)-cellulose/silica gel (Chir