A new synthesis of Entacapone and report on related studies
作者:ATTIMOGAE SHIVAMURTHY HARISHA、SURESH PARAMESHWAR NAYAK、PAVAN M S、SHRIDHARA K、SUNDARRAJA RAO K、RAJENDRA K、KOTEPPA PARI、SIVARAMKRISHNAN H、GURU ROW T N、KUPPUSWAMY NAGARAJAN
DOI:10.1007/s12039-015-0961-4
日期:2015.11
established. NMR methods for deriving E and Z geometry and other similar molecules have been successfully established, mainly by studying the proton coupled 13C spectra. Preliminary studies reveal in vitro activity for some compounds against tuberculosis (TB) and dengue. A new synthesis of entacapone 1 of a designed precursor under very mild conditions is reported. Crystal structure of its Z isomer, NMR methods
Describes a method for obtaining substantially pure chloromethyl chloroformate from a chloroformate mixture comprising chloromethyl chloroformate and methyl chloroformate by heating the chloroformate mixture in a reaction zone at temperatures ranging from at least 50° C. to the reflux temperature of the chloroformate mixture in the reaction zone while simultaneously removing volatile gaseous decomposition products from the reaction zone. Dichloromethyl chloroformate may also be present in the chloroformate mixture.
Anion radical salts of bis[1,2,5]thiadiazolotetracyanoquinodimethan (BTDA) containing forty kinds of alkylammonium ions were prepared whose molar ratios are unique for each cation and changed from 1:1 (2A–2L) to 2:3 (2M–2Z), 1:2 (2a–2m), and 2:5 (2n) with elongation of the side chains. The electrical conductivities of the salts are largely affected by the molar ratio and the spatial requirement of
The potential of methylsiloxanes as solvents for synthetic chemistry applications
作者:Mohd Azri Ab Rani、Nadine Borduas、Victoria Colquhoun、Robert Hanley、Henry Johnson、Solène Larger、Paul D. Lickiss、Veronica Llopis-Mestre、Selina Luu、Martin Mogstad、Philipp Oczipka、James R. Sherwood、Tom Welton、Jun-Yi Xing
DOI:10.1039/c3gc42036a
日期:——
The potential use of volatile methylsiloxanes (VMSs) as solvents for chemicals synthesis has been explored. Assessment of the environmental impact of these VMS solvents is made and found to be significantly lower than those of the non-polar organic solvents that they have the potential to replace. The polarities of the VMSs, as expressed by empirical polarity measurements, and miscibilities with other liquids are found to be similar to those of alkane solvents. Finally, some uses of VMSs as solvents for both organic and inorganic transformations are described. The VMSs provide environmentally more sustainable (greener) alternatives to the nonpolar solvents that they have the potential to replace.
[EN] HYDROGENATION PALLADIUM-SILVER CATALYSTS AND METHODS FOR THEIR PREPARATION<br/>[FR] CATALYSEURS D'HYDROGENATION PALLADIUM-ARGENT ET PROCEDE DE PREPARATION DE CEUX-CI
申请人:CHEVRON PHILLIPS CHEMICAL CO
公开号:WO2003106020A1
公开(公告)日:2003-12-24
A catalyst composition comprising palladium, silver and a support material (preferably alumina) is contacted with a liquid composition comprising an iodide component such as ammonium iodide, and the catalyst is then calcined. An improved process for hydrogenation, especially selectively hydrogenating acetylene (to ethylene), using this improved catalyst composition with improved conversion and deactivation.