Diglyme as Solvent in the Gasometric Determination of Silanols by the Lithium Aluminum Hydride Method.

Abstract

+ 0.46 o-Nitrocinnamic acid 23.88 23.55 -0.33 23.84 -0.40 o-Nitrobenz aldehyde 30.46 30.21 -0.25 29.96 -0.50 4-Chloro-l,3-dinitrobenzene 45.45 45.97 + 0.52 45.76 + 0.31 Nitrobenzene 37.40 37.26 -0.14 36.99 -0.41 3,5-Dinitrobenzoic acid 43.39 43.72 + 0.33 43.81 + 0.42 p-Nitrobenzoic acid 27.54 27.27 -0.27 27.51 -0.03 ro-Nitrobenzoic acid 27.54 27.28 -0.26 27.03 -0.51 Cyclohexanone-2,4-dinitrophenylhydrazone 33.09 32.70 -0.39 32.68 -0.41 4-Bromo-3-nitrobenzoic acid 18.70 18.32 -0.38 3-Nitrophthalic anhydride 25.44 25.69 LITERATURE CITED

Volumetric and Gravimetric Analytical Methods for Organic Compounds

“…Diglyme is reported to be a better solvent than dibutyl ether as a solvent for the gasometric determination of silinols by the lithium aluminum hydride method (18). The available methods of determining organometallic compounds were evaluated for estimation of organosilylmetallic compounds.…”

“…Several new books and translations of older works in other languages into English have appeared during the past two years (16,18,39,108). Much new and interesting material is to be found in the annual reports of the Conference on Applications of X-Ray Analysis held annually at the Denver Research Institute (68) and the report of the Conference on the Direct Observation of Imperfections in Crystals held in 1961 in St. Louis, Mo.…”

Organic Microchemistry

“…The filtrate was shaken with an ion exchange resin and finally titrated with 0.01V Ba(C104)2 using thoron and methylene blue as the indicator system. Aragones-Apodaca (18) employed the same titrant and indicator system in aqueous isopropyl alcohol. Kramer (169) determined the SO4 2 gravimetrically after closed-flask combustion.…”

New Selective Method for Quantification of Organosilanol Groups in Silicone Pre-elastomers

“…5 Another method suitable for manometrical measurement is treatment with the strong reducing agent lithium aluminum hydride, which leads to the formation of hydrogen gas. 6 Several titration methods have also been described. In potentiometric titrations, silanols can be titrated as weak acids with a strong base, e.g., lithium aluminum dibutylamide.…”