A --33,700 (oxygen ring left) (The value of A for /3-d-glucosidodihydroxyacetone pentaacetate may be derived from its rotation of [«]18d -25.2°r eported by Kreider and Evans.4) The above numerical values of A agree among themselves very closely when it is remembered that the Van't Hoff rule of optical superposition on which these calculations are based is known to be only approximate in its quantitative predictions. These values tend to substantiate the structure ascribed to the new compounds reported in the experimental part of this paper.
Oxidation of 1,2‐Thiazoles; A Convenient Approach to 1,2‐Thiazol‐3(2H)‐one 1,1‐Dioxides
The 1,2‐thiazoles obtained from 3‐chloroalk‐2‐enals and ammonium thiocyanate (7 → 9, Scheme 1) are easily transformed to 1,2‐thiazol‐3(2H)‐one 1,1‐dioxidcs 10 on treatment with H2O2 in AcOH at 80°. Hydrogenation of 10 in AcOH yields the corresponding saturated 1,2‐thiazolidin‐3‐one 1,1‐dioxides 16 (Scheme 3). Cycloalka[c]‐1,2‐thiazoles 18 are prepared from 2‐[(thiocyanato)methyliden]cycloalkan‐1‐ones and ammonia (Scheme 4). Surprisingly, oxidation of 18a with H2O2 in AcOH yields the tricyclic oxaziridine 19.
Die Struktur der bekannten, aus MoO2Mes2 1 und LiMe dargestellten Verbindung LiMoO2Me2Mes(OEt2)2 2 [2] sowie ihre NMR‐spektroskopischen Daten werden mitgeteilt. 2 bildet ein in der Raumgruppe P1 kristallisierendes Dimer durch Verknüpfung zweier [MoO2Me2Mes]−‐Anionen über Oxo‐Liganden durch zwei Kationen [Li(OEt2)2]+. Der gebildete [‥OMoOLi‥]2− Achtring ist eben.
Oxidation of 1,2-Thiazoles: A Convenient Approach to 1,2-Thiazol-3(2H)-one 1,1-Dioxides.-With a view to the valuable therapeutical properties of several thiazole 1,1-dioxides the title compounds (IV) are synthesized by oxidation of the corresponding thiazoles (III). The oxidation of the compound (VI) which is isomeric to (IIIe) leads to the sulfonyloxaziridine (VII). -(SCHULZE, B.; KIRSTEN, G.; KIRRBACH, S.; RAHM, A.; HEIMGARTNER, H.; Helv.
Die Umsetzung von WOCl4 mit MesMgBr (1 : 1) führt in Tetrahydrofuran (THF) unter Reduktion zu Wolfram(V), das in Form von [MgX(THF)4][WOCl4(THF)] (2) und nach Abspaltung von MgX2 als [Mg(THF)4{OWCl4(THF)}2] (3) isoliert werden kann. Die Reaktion von WOCl4 mit MesMgBr im molaren Verhältnis 1 : 4 führt über die Reduktion zu [WOMes3(THF)] · THF (4). Die genannten Verbindungen werden durch Kristallstrukturanalysen charakterisiert. In 2 und 3 sind [WOCl4(THF)]–‐Anionen über ihre Oxo‐Liganden an Magnesium koordiniert. 4 hat eine verzerrt trigonal‐bipyramidale Ligandenanordnung.
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