No abstract

the mixture was cooled at 0 °C. Filtration of the precipitated product followed by washing with ether afforded 5 (285 mg, 84%) as a crystalline monohydrochloride salt. Recrystallizaton from methanol gave the analytical sample, mp >280 °C. UV (pH 1) 271 nm (t 14620), 234 (e 17850);(pH 1) 250 (t 8000); (pH 7) 269 (e 8920), 230 (e 22460); Xmin (pH 7) 249 (t 6000); Xmai (pH 13) 285 (t 6920), 257 (e 6620), 223 (e 23540); X^(pH 13) 271 (e 6120), 249 (e 6450).

No abstract

No abstract

The hydrolysis of functional trialkoxysilanes was studied under various conditions by 'H NMR spectroscopy. The silane concentration was 1 -2% by weight in a water/acetonesystem. Under these conditions, the reaction was found to be first order. In detail, influence of pH, grade of stirring, and size and structure of functional groups of the alkyltrialkoxysilanes were investigated in order to compare the relative reaction rates of the different compounds. Einleitung