6689-43-6Relevant academic research and scientific papers
Synthesis of functionalized 1-trimethylsiloxy-substituted O-trimethylsilyl alkylphosphonites and their derivatives
Prishchenko, Andrey A.,Livantsov, Mikhail V.,Novikova, Olga P.,Livantsova, Ludmila I.,Petrosyan, Valery S.
, p. 352 - 359 (2008/09/20)
Nucleophilic addition of trimethylsilyl esters of tricoordinate organophosphorus acids to various functionalized aldehydes with vinyl, aryl, and heterocyclic fragments is proposed as a convenient method for the synthesis of new 1-trimethylsiloxysubstituted alkylphosphonites and their derivatives at mild conditions. Also the new functionalized derivatives of these phosphonites, including amino groups as well as certain properties of these compounds as important precursors of new functionalized 1-hydroxyalkylorganophosphorus acids, are presented.
29Si and 13C NMR Spectra of 4-Substituted 2-Methoxytrimethylsiloxybenzenes. Factors Determining the Chemical Shifts in Models of Lignin Constituents
Schraml, Jan,Kvicalova, Magdalena,Chvalovsky, Vaclav,Elder, Thomas,Brezny, Robert
, p. 973 - 978 (2007/10/02)
29Si and 13C NMR chemical shifts are reported for a series of twenty 4-substituted 2-methoxytrimethylsiloxybenzenes; the set of substituents incorporates a basic set of ten substituents differing in their relative polar and resonance effects and ten other
Fragmentation of Trimethylsilyl Derivatives of 2-Alkoxyphenols: a Further Violation of the 'Even-electron Rule'
Krauss, Dietlinde,Mainx, Hans Georg,Tauscher, Bernhard,Bischof, Peter
, p. 614 - 618 (2007/10/02)
The mass spectra of trimethylsilyl (TMS) ethers of 2-methoxyphenols show abundant +* ions originating from consecutive loss of two methyl radicals.This is illustrated by comparison of the accurate mass-measured and linked-scan spectra of the TMS derivatives of 2-methoxyphenol (guaiacol), 4-hydroxy-3-methoxybenzaldehyde (vanillin) and 3-(4-hydroxy-3-methoxyphenyl)-2-propenoic acid methyl ester (ferulic acid methyl ester) with those of the TMS derivatives of phenol, 4-hydroxybenzaldehyde, 3-(4-hydroxyphenyl)-2-propenoic acid methyl ester (p-coumaric acid methyl ester), 3-methoxyphenol and 4-methoxyphenol.This distinctive ortho effect is valuable in the identification of isomeric phenolic compounds.In the spectra of the TMS derivatives of 2-ethoxyphenol and 2-propoxyphenol the sequential loss of two radicals is less pronounced, because elimination of the side-chain and methyl group with rearrengement and hydrogen migration is competitive.
UNERWARTETE REAKTIONSPRODUKTE VON N-METHYL-N-TRIMETHYLSILYLTRIFLUORACETAMID (MSTFA) MIT ALDEHYDEN
Ende, M.,Luftmann, H.
, p. 5167 - 5170 (2007/10/02)
Aldehydes react with MSTFA (N-methyl-N-trimethylsilyl-trifluoroacetamide) to give E/Z-silylenolethers and surprisingly addition products of the reagent to the carbonyl group.The mass spectra of the MSTFA/aliphatic aldehyde adducts are dominated by a key fragment of m/z 228 formed by elimination of the alkyl part.With MSTFA/aromatic aldehyde adducts this fragmentation is replaced by M-H and M-CH3N.8COCF3 (M-126 amu) ions.
