نتایج جستجو برای: thioamides
تعداد نتایج: 235 فیلتر نتایج به سال:
The reaction of [(CO)5Cr(THF)] with propynethioic acid amides, R–C≡C–C(=S)NMe2 (R = H, SiMe3), yields the thioamide complexes [(CO)5Cr–S=C(NMe2)C≡C–H] (1a) and [(CO)5Cr– S=C(NMe2)C≡C–SiMe3] (1b). Treatment of solutions of 1a or 1b with methyllithium generates, via deprotonation or desilylation, the lithium salt Li[(CO)5Cr–S=C(NMe2)C≡C] (2). On filtration over silica, 2 is readily reprotonated. ...
It has been found that 2,7-di-tert-butylpyrene reacts with aliphatic iso(thio)cyanates in the presence of trifluoromethanesulfonic acid to exclusively afford the corresponding 1-substituted (thio)amides in high yields. For aromatic iso(thio)cyanates the reaction is less regioselective, although substitution at the 1-position prevails. For ethoxycarbonyl isothiocyanate, apart from the 1-substitu...
Backbone modification is a common chemical tool to control the conformation of linear peptides and to explore potentially useful effects on their biochemical and biophysical properties. The thioamide, ψ[CS-NH], group is a nearly isosteric structural mimic of the amide (peptide) functionality. In this paper, we describe the solution synthesis, chemical characterization, preferred conformation, a...
Meadowfoam ( Limnanthes alba ) is an oilseed crop grown in western Oregon. After extraction of the oil from the seeds, the remaining seed meal contains 2-4% of the glucosinolate glucolimnanthin. This study investigated the effect of fermentation of seed meal on its chemical composition and the effect of the altered composition on downy brome ( Bromus tectorum ) coleoptile emergence. Incubation ...
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