Determination of Unsaturation in Organic Compounds by Electrometric Titration

Abstract

The mercury-catalyzed addition of bromine to isolated double bonds proceeds so rapidly that they can be determined by direct titration in the homogeneous phase. The end point is indicated electrometrically. As no excess of bromine is used, the

Unsaturation Determination by Acid-Catalyzed Bromination

“…Values of the titer of standard sodium thiosulfate required for blank determinations over a period of 384 hours are shown in Table I. The use of catalysts for bromine addition has been reported by Braae (1) and others. In general, halogen acids, mercury', silver, nickel, and antimony salts, as well as mixtures of these and other components, have been successful in accelerating addition.…”

The Reaction of Grignard Reagents with 3,4-Epoxy-1-Butene. II. Ethylmagnesium Bromide and Diethylmagnesium

“…), 1.4368-1.4380. The over-all yield of isomeric alcohols (CeH^O) as determined by electrometric bromination (31) was 54.3 g. (0.543 mole, 70.3%). Based upon the distillation curve, this was divided into (I) 41.2 g. (53.4%) and (II) 13.1 g. (16.9%).…”

Potentiometric Titrations

“…A 0.001 N potassium brómate solution was used. The dead-stop method has also been employed by Braae (7) to determine the end point of the mercury-catalyzed addition of bromine to double bonds.…”