N-1-Trimethylsilyl Derivatives of Ergot Alkaloids

1996 ◽  
Vol 61 (8) ◽  
pp. 1248-1253 ◽  
Author(s):  
Vladimír Křen ◽  
Petr Sedmera
Keyword(s):  
Ergot Alkaloids ◽  
Nitrogen Atmosphere ◽  
Clavine Alkaloids ◽  
Trimethylsilyl Derivatives ◽  
Derivatives Of

N-1-Trimethylsilyl derivatives of five different suitably protected parent ergot (clavine) alkaloids (agroclavine 1a, elymoclavine 2a, lysergol 3a, lysergene 4a, and 9,10-dihydrolysergol 5a) were prepared in 47-94% yields by refluxing the (protected) parent compounds with N-methyl-N-(trimethylsilyl)trifluoroacetamide in acetonitrile under nitrogen atmosphere.

ChemInform Abstract: TRIMETHYLSILYL DERIVATIVES OF TITANIUM

1978 ◽  
Vol 9 (19) ◽  
Author(s):  
G. A. RAZUVAEV ◽  
V. N. LATYAEVA ◽  
L. I. VYSHINSKAYA ◽  
A. V. MALYSHEVA ◽  
G. A. VASI'EVA
Keyword(s):  
Trimethylsilyl Derivatives ◽  
Derivatives Of

ChemInform Abstract: N-Trimethylsilyl Derivatives of Thiolactams in N-Amido- and N- Sulfonamidoalkylation.

ChemInform ◽  
2010 ◽  
Vol 25 (43) ◽  
pp. no-no
Author(s):  
V. N. SERGEEV ◽  
S. A. ARTAMKIN ◽  
YU. I. BAUKOV
Keyword(s):  
Trimethylsilyl Derivatives ◽  
Derivatives Of

scholarly journals Gas-Chromatographic Determination of the Trimethylsilyl Derivatives of Polyhydric Alcohol Humectants in Tobacco and in Tobacco Smoke

1971 ◽  
Vol 6 (2) ◽  
Author(s):  
N. Carugno ◽  
S. Rossi ◽  
G. Lionetti
Keyword(s):  
Gas Chromatography ◽  
Mass Spectra ◽  
Triethylene Glycol ◽  
Chromatographic Determination ◽  
Flame Ionization ◽  
Trimethylsilyl Derivatives ◽  
Gas Chromatographic Method ◽  
Derivatives Of ◽  
Quantitative Procedure

AbstractA qualitative and quantitative procedure has been developed for the determination of humectants in manufactured tobacco by gas-chromatographic method with a flame ionization detector. It consists of extraction with methanol, concentration of the extract and treatment with Tri-Sil reagents. The operating gas-chromatographic conditions are set forth. Samples of tobacco containing glycerine, propylene glycol, diethylene glycol, triethylene glycol, 1-3 butylene glycol and sorbitol have been analysed with recoveries, for the first five ones, in the range of 95-104 %. In order to verify that each chromatographic peak corresponded to the relative glycol, with no interference by other silylated compounds, the mass spectra were obtained through the combination of gas-chromatography with mass spectrometry. The results achieved confirm, as far as tobacco is concerned, that the procedure is accurate and precise. The same method for the determination of humectants was extended to cigarette smoke. Even though this involves morecomplicated problems, as compared to tobacco, because of the presence of silylated compounds, it was found that, for certain glycols, the gas-chromatography of the trimethyl derivatives can be also used as a method of analysis. The mass spectra of some polyhydric alcohols are shown

Strukturvergleich bei 9,10-Dihydro-9,10-anthrylen-Verbindungen des Magnesiums und des Alkylaluminiums / Comparison between the Structures of 9,10-Dihydro-9,10-anthrylene Compounds of Magnesium and Alkylaluminium

1985 ◽  
Vol 40 (11) ◽  
pp. 1504-1510 ◽  
Author(s):  
Herbert Lehmkuhl ◽  
Abdul Shakoor ◽  
Klaus Mehler ◽  
Carl Krüger ◽  
Yi-Hung Tsay
Keyword(s):  
Ring Size ◽  
Coordination Geometry ◽  
Chemical Behaviour ◽  
Trimethylsilyl Derivatives ◽  
Derivatives Of

In magnesium as well as in aluminium derivatives of anthracene (1−4, 8) and its trimethylsilyl derivatives (5, 6 and 11), the metals occupy the axial positions at C9 and CIO, to form five-, seven- or ten-membered metallacycles, respectively, in 1−3, 5, 6 and 11. It appears that the metalla-ring size, and thus the coordination geometry of the bridging metal is of influence upon the chemical behaviour.

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