The process relies on the hydrolytic polycondensation reactions of alkoxysilanes, usually (EtO)4Si, in which the reactive silanols (EtO)4–n Si(OH)n (n = 1–4) are formed. These then undergo acid- or base-catalyzed condensation with both water and alcohol formation, as shown in Scheme ...
and the molten solution, after solidification and after being cooled down to a temperature at which hydrogen generating reactions do not take place, is leached with water and rinsed out of the core catcher without the need for humans to be present in the reactor containment and to be exposed ...
The above examples suggest that the hydrolysis reactions of SO3 and HCHO can be promoted by double proton transfer processes with water, organic acids and ammonia as homogeneous catalysts. Similar hydrolysis reactions have also been observed for various atmospheric species, such as Criegee intermediates...
However, structurally complicated and bioactive natural products can be accessible through protecting-group-free (PGF) total syntheses, which are usually much more efficient, provided that the individual reactions proceed with high chemoselectivity. In this Review, we present innovations in methodology and...
Reactions of bis(thio)-W(VI) complexes, LWS2X (L = hydrotris (3,5-dimethylpyrazol-1-yl)borate, X = monoanion), with alkynes produce dithiolene complexes, L... AA Eagle,GN George,ERT Tiekink,... - 《Journal of Inorganic Biochemistry》 被引量: 54发表: 1999年 THE CRYSTAL AND MOLECUL...
By switching the reagents involved, the present strategy may be extended to other classes of dicarbofunctionalization reactions. Mechanistic and computational investigations offer insights into the origin of the observed regiochemical outcome and the utility of the method is highlighted through the concise...
Reactions of the chlorides of n... RB King,RN Kapoor,MS Saran,... - 《Inorganic Chemistry》 被引量: 240发表: 1971年 Stoichiometric and Catalytic Activation of SiH Bonds by a Triruthenium Carbonyl Cluster, (μ 3 ,η 2 :η 3 :η 5 -acenaphthylene)Ru 3 (CO) 7 : Isolation of... ...
Functional groups are considered the atoms or bonds within molecules, which determine the characteristic chemical reactions of these molecules. The two main functional groups that affect the soil-water system are: (a) groups having a C–O bond, for example, carboxyl, carbonyl, hydroxyl, methoxyl,...
(111) provided the information about the dominant reactions, and a measure of the relative rates. The trend of reaction barriers and accessibility to the separate pathways are similar to the results on Cu(100). However, the chemisorbed perfluoroethyl on Cu(111) was also found to be able to...
Nitrosation Reactions in Water/AOT/Xylene Microemulsions A kinetic study of the nitroso group transfer from N-methyl-N-nitroso-p-toluenesulfonamide (MNTS) to the secondary amines piperazine (PIP) and N-methylbenz... L García-Río,P Hervés,JC Mejuto,... - 《Industrial & Engineering Chemistry...