Reaction of 1,1-dichloroethane with tellurium in the system hydrazine hydrate-potassium hydroxide
摘要:
The reaction of 1,1-dichloroethane with tellurium in the system hydrazine hydrate-potassium hydroxide gave ethyltellanyl derivatives as a result of replacement of one chlorine atom in the substrate by tellurium, and of the other, by hydrogen. Probable mechanisms of reduction of the C-Cl bond and mass spectra of the products were considered. The mass spectra of ditelluroacetals revealed unusual rearrangement of the molecular ion, leading to the formation of Te-Te and new C-C bond.
isopropyl-2-phenylethynyl telluride was obtained in 86% yield, indicating that an alkanetellurolate is an intermediate in this reaction. Contrary to this result, reduction of divinyl ditellurides with lithium aluminum hydride in tetrahydrofuran or with lithium in liquid ammonia furnished ethenetellurolate anions, which on reaction with alkyl halides afforded vinyl alkyltellurides [C4H9TeCH=CH2, C4H9Te(CH3)C=CH2
Synthesis of novel tellurides bearing benzensulfonamide moiety as carbonic anhydrase inhibitors with antitumor activity
作者:Damiano Tanini、Lorenzo Ricci、Antonella Capperucci、Lorenzo Di Cesare Mannelli、Carla Ghelardini、Thomas S. Peat、Fabrizio Carta、Andrea Angeli、Claudiu T. Supuran
DOI:10.1016/j.ejmech.2019.111586
日期:2019.11
We have synthetized a novel series of β-hydroxy tellurides bearing the benzenesulfonamide group as potent inhibitors of carbonic anhydrase enzymes. In a one pot procedure, we discovered both the ring opening reaction of the three-membered ring and the cleavage of the sulfonamide protecting moiety at the same time. Moreover, the first X-ray co-crystallographic structure of a β-hydroxy telluride derivative
Preparation of Alkanechalcogenolate- and Benzenechalcogenolate-Bridged Diruthenium Complexes and Their Catalytic Activity toward Propargylation of Acetone with Propargylic Alcohol
e (SPh, SePh, TePh)-bridged dirutheniumcomplexes have been newly prepared, and their catalytic activity toward the propargylation of acetone with propargylicalcohol has been investigated for comparison. Ab initio molecular orbital calculations of syn and anti methanechalcogenolate-bridged, propane-2-selenolate-bridged, and benzenethiolate-bridged dirutheniumcomplexes have been carried out to explain
Oxidative addition reactions of dialkylchalcogenanes R2E2 and [Me2Si(Nt-Bu)2]Ge 1 yielded bis(alkylchalcogeno)germanes Me2Si(Nt-Bu)2Ge(ER)2 (R = Et, E = S 2, Se 3; R = Me, E = Se 4) and digermanes [Me2Si(Nt-Bu)2Ge(EEt)]2 (E = S 5, Se 6). The reaction of 1 with Et2Te2 proceeds with formation of Me2Si(Nt-Bu)2Ge(TeEt)27, which slowly converts into the Te-bridged complex [Me2Si(Nt-Bu)2GeTe]28. 1-6 and
二烷基硫属元素烷R2E2和[Me2Si(Nt-Bu)2] Ge 1的氧化加成反应生成双(烷基硫属元素基)锗烷Me2Si(Nt-Bu)2Ge(ER)2(R = Et,E = S 2,Se 3; R = Me,E = Se 4)和二茂铁[Me 2 Si(Nt-Bu)2 Ge(EEt)] 2(E = S 5,Se 6)。1与Et2Te2的反应会继续形成Me2Si(Nt-Bu)2Ge(TeEt)27,该反应缓慢转化为Te-桥联络合物[Me2Si(Nt-Bu)2GeTe] 28。通过单晶X射线衍射表征1-6和8。
Reaction of .BETA.-Ethoxyvinyl Lithiums Generated from Phenyltellanyl- and Ethyltellanylacetaldehyde Diethyl Acetals with Aldehydes and Ketones and Successive Hydrations
作者:Mitsuhiro Yoshimatsu、Fumihiro Hatanaka
DOI:10.1248/cpb.52.248
日期:——
Reactions of alpha-tellanyl-beta-ethoxyvinyl lithiums of aldehydes and ketones proceeded in good to high yields and the successive treatment with acids gave the alpha-tellanyl alpha,beta-unsaturated aldehydes. alpha-Tellanyl alpha,beta-unsaturated aldehydes easily transformed to more useful compounds.