Tetramethyl Thiourea/Co2(CO)8-Catalyzed Pauson−Khand Reaction under Balloon Pressure of CO

2005 ◽  
Vol 7 (4) ◽  
pp. 593-595 ◽  
Author(s):  
Yefeng Tang ◽  
Lujiang Deng ◽  
Yandong Zhang ◽  
Guangbin Dong ◽  
Jiahua Chen ◽  
...  
Keyword(s):  
Tetramethyl Thiourea

scholarly journals Tetramethyl Thiourea/Co2(CO)8-Catalyzed Pauson—Khand Reaction under Balloon Pressure of CO.

ChemInform ◽  
2005 ◽  
Vol 36 (27) ◽  
Author(s):  
Yefeng Tang ◽  
Lujiang Deng ◽  
Yandong Zhang ◽  
Guangbin Dong ◽  
Jiahua Chen ◽  
...  
Keyword(s):  
Tetramethyl Thiourea

A Concise Synthesis of Presilphiperfolane Core through a Tandem TMTU-Co-Catalyzed Pauson-Khand Reaction and a 6π Electrocyclization Reaction (TMTU=Tetramethyl Thiourea)

2017 ◽  
Vol 23 (6) ◽  
pp. 1258-1262 ◽  
Author(s):  
Zichun Zhang ◽  
Yuanhe Li ◽  
Dandan Zhao ◽  
Yingdong He ◽  
Jianxian Gong ◽  
...  
Keyword(s):  
Tetramethyl Thiourea

scholarly journals Complex Formation Equilibria between Ag(I) and Thioureas in Propan-2-ol

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Domenico De Marco
Keyword(s):  
Complex Formation ◽  
Background Electrolyte ◽  
Complex Formation Equilibria ◽  
Entropy Changes ◽  
Enthalpy And Entropy Changes ◽  
Formation Equilibria ◽  
Enthalpy And Entropy ◽  
The Stability ◽  
Tetramethyl Thiourea ◽  
Stepwise Formation

The complex formation equilibria between Ag(I) and thiourea (Tu), N methyl-Thiourea (MeTu), N,N′-dimethyl-Thiourea (Me2Tu), N,N,N′,N′ Tetramethyl-Thiourea (Me4Tu), N-ethyl-Thiourea (EtTu), N,N′ diethyl-Thiourea (Et2Tu), and N,N′-Ethylen-Thiourea (EnTu) in propan-2-ol as solvent medium have been investigated by potentiometry within the temperature range 10°C–40°C and self-determined ionic medium by (AgNO3) concentration range 6.36·10-6–3.83·10-5 m·dm−3 (no background electrolyte added). The experimental results can be interpreted with the stepwise formation of tris-coordinated complexes AgLn  (n=1–3; hereafter charge is omitted). The stability constants log βn and the standard thermodynamic changes in enthalpy (ΔHn°) and entropy (ΔSn°) for overall complex formation reactions AgI+nL=AgLn (n=1–3) have been evaluated. The reactions are exothermic in nature and entropy disfavored for all the investigated ligands. The standard enthalpy and entropy changes for the stepwise reactions AgLn-1+L=AgLn have been evaluated by difference ΔΔHn°=ΔHn°-ΔHn-1° and ΔΔSn°=ΔSn°-ΔSn-1°. The stepwise enthalpy are mutually linearly related to the corresponding entropy changes with isoequilibrium temperatures Tiso=285, 305, and 363 K for n=1, 2, or 3 respectively.

ZnO-nanorods as economical catalyst for synthesis of 4-amino-2-iminodithiole derivatives using tetramethyl thiourea in water

2016 ◽  
Vol 70 (7) ◽  
Author(s):  
Faramarz Rostami-Charati ◽  
Rahimeh Hajinasiri ◽  
Seyyed Zahra Sayyed Alangi ◽  
Saeid Afshari Sharif Abad
Keyword(s):  
Ambient Temperature ◽  
Zno Nanorods ◽  
Alkyl Bromides ◽  
Tetramethyl Thiourea

Abstract4-amino-2-iminodithiole derivatives were synthesised via multi-component reactions of tetramethyl thiourea, isothiocyanates and alkyl bromides in the presence of ZnO nanorods (ZnO-NR) as the catalyst in water at ambient temperature. These reactions provide low yields without catalysts. The catalyst exhibited significant reusable activity.

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