ChemInform Abstract: Trifluoromethanesulfonic Acid-Catalyzed Solvent-Free Bisindolylation of Trifluoromethyl Ketones.

ChemInform ◽  
2014 ◽  
Vol 45 (28) ◽  
pp. no-no
Author(s):  
Yi Wang ◽  
Yu Yuan ◽  
Chun-Hui Xing ◽  
Long Lu
Keyword(s):  
Trifluoromethanesulfonic Acid ◽  
Solvent Free ◽  
Trifluoromethyl Ketones ◽  
Acid Catalyzed

ChemInform Abstract: Solvent-Free Broensted Acid Catalyzed Alkylation of Arenes and Heteroarenes with Benzylic Alcohols.

ChemInform ◽  
2014 ◽  
Vol 45 (31) ◽  
pp. no-no
Author(s):  
Margherita Barbero ◽  
Silvano Cadamuro ◽  
Stefano Dughera ◽  
Marta Rucci ◽  
Giulia Spano ◽  
...  
Keyword(s):  
Solvent Free ◽  
Benzylic Alcohols ◽  
Acid Catalyzed

Simple Access to α, β Unsaturated Ketones by Acid-Catalyzed Solvent-Free Reactions

1999 ◽  
Vol 29 (20) ◽  
pp. 3651-3657 ◽  
Author(s):  
Erwan Le Gall ◽  
Françoise Texier-Boullet ◽  
Jack Hamelin
Keyword(s):  
Solvent Free ◽  
Unsaturated Ketones ◽  
Acid Catalyzed

Storage Stability of Solvent-Free Condensates of Functionalized Trialkoxysilanes

1999 ◽  
Vol 576 ◽  
Author(s):  
S. Stein ◽  
St. Cramer V. Clausbruch ◽  
N. Moszner ◽  
V. Rheinberger Ivoclar Ag
Keyword(s):  
Methyl Ether ◽  
Storage Stability ◽  
Solvent Free ◽  
Residual Silanol Groups ◽  
Acid Catalyzed ◽  
Chemical Conditions ◽  
Degree Of Condensation ◽  
Hydrolysis Of ◽  
Initial Viscosity ◽  
Butyl Methyl Ether

ABSTRACTThe lack of storage stability of organic-inorganic solvent-free sols is a well-known problem. We investigated the influence of different solvents in the acid catalyzed hydrolysis of various sols on their storage stability. Our experiments were based on two different silanes, 3-methacryloxypropyltrimethoxysilane (MPTS) and 1,1,1-tris(allyloxymethyl)-l-[[[3-(triethoxysilyl)propyl]aminocarbonyl]oxymethyl]methane (silane 31), synthesized by reaction of pentaerythritol triallyl ether and 3-isocyanatopropyltriethoxysilane. The employed solvents were alcohol, tetrahydofuran and tert-butyl methyl ether in a range of 95 wt% to 30 wt% in solution. In order to get comparable chemical conditions the degree of condensation of the various sols were adjusted between 75% and 85%. Furthermore, the sols were modified by silylation with trimethylchlorosilane. A comparison of silylated and not silylated silane 31 clearly showed that a decrease in residual silanol groups increase the storage stability. The results of the investigations demonstrated that both the kind and the amount of solvent used in hydrolysis affects the initial viscosity of solvent-free condensates of silane 31 and MPTS.

Sign in / Sign up

Export Citation Format

Share Document