A new mixed amino-amido N-heterocyclic carbene based on anthranilic acid
The synthesis of a new mixed amino-amido N-heterocyclic carbene (type A) starting from anthranilic acid is presented. A new straightforward synthetic approach to related diaminocarbenes of type B is also described. Both NHCs react with group 6 elements to form heteroureas and coordinate to L2ClM fragments (M = Rh, Ir; L2 = COD, (CO)2). IR spectroscopic analysis of the carbonyl complexes reveals that the diamino-NHC is a better donor ligand (TEP: 2054 cm-1) compared to the amino-amido NHC (TEP: 2060 cm-1). In line with this behavior, a carbene dimerization to give the corresponding olefin is observed only for derivatives of type A. X-ray structure determinations are reported for two Rh complexes of ligand A and its cationic precursor.
Makhloufi, Abdelaziz,Wahl, Michaela,Frank, Walter,Ganter, Christian
p. 854 - 861
(2013/03/28)
ALKYLATION OF THE SALTS OF 1-METHYL-2-THIOXOQUINAZOLIN-4-ONES
During the alkylation of 1-methyl-2-thioxoquinozolin-4-one the methyl group adds mainly at the N3 atom.In the case of the "hard" alkylating agent methyl p-toluenesulfonate the reaction hardly depends at all on the nature of the counterion and the solvent.
Yun, L. M.,Yangibaev, S.,Shakhidoyatov, Kh. M.,Alekseeva, V. Ya.,V'yunov, K. A.
p. 2196 - 2200
(2007/10/02)
A Mass Spectral Rearrangement of 2-(Alkylamino)benzoic Acid Derivatives and Related Heterocyclic Systems
The behavior of a series of 2-(alkylamino)benzoic acid derivatives and related heterocyclic systems has been investigated using electron impact mass spectrometry and fragmentation pathways have been formulated.Deuterium-labeled and 13C-labeled compounds w
Barbuch, Robert J.,Peet, Norton P.
p. 816 - 820
(2007/10/02)
SYNTHESIS AND SPECTRAL EXAMINATION OF THE POSITION OF TAUTOMERIC EQUILIBRIUM IN 2-THIOXO-4-QUINAZOLONE
2-Thioxo-4-quinazolone and its derivatives mono- and dimethylated at ring atoms N(1) and N(3) and the exocyclic sulfur have been synthesized.Using model compounds, UV spectroscopy has been used to show that 2-thioxo-4-quinazolone exists in the thioketo-form, no appreciable amounts of the thiol or enol isomers being present.
Yun, L. M.,Yangibaev, S.,Shakhidoyatov, Kh. M.,Alekseeva, V. Ya.,V'yunov, K. A.
p. 1001 - 1003
(2007/10/02)
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