Titration endpoint challenge

Solution to half-titration challenge.

Titration of alkyllithiums with a simple reagent to a blue endpoint

Reaction of readily available N-benzylbenzamide (I) with a slight excess of BuLi produces a deep blue dianion. Under suitable conditions (THF, -40*(2), 1 may be used as a stoichiometric reagent to titrate n-BuLl, s-BuLi, and t-BuLi with good precision. Less reactive alkyllithiums (MeLi and MeLi, LiBr), aryllithiums, and LDA may be titrated at higher temperatures ( 20 to 0°C). Titres are compara...

Colloidal titration of aqueous zirconium solutions with poly(vinyl sulfate) by potentiometric endpoint detection using a toluidine blue selective electrode.

Zirconium oxy-salts were hydrolyzed to form positively charged polymer or cluster species in acidic solutions. The zirconium hydrolyzed polymer was found to react with a negatively charged polyelectrolyte, such as poly(vinyl sulfate), and to form a stoichiometric polyion complex. Thus, colloidal titration with poly(vinyl sulfate) was applied to measure the zirconium concentration in an acidic s...

Timing and nature of wheezing at the endpoint of a bronchial challenge in preschool children.

Bronchial reactivity to inhaled agents in preschool children can be undertaken by auscultating the lungs to detect wheezing, but there is a lack of information on when wheeze first appears at the endpoint of the challenge and on the acoustic characteristics of the wheeze. We recorded breath sounds continuously during tidal breathing inhalation challenges with adenosine 5'-monophosphate, using s...

Bootstrapping Endpoint

It is known that bootstrapping maximum for estimating the endpoint of a distribution function is inconsistent and subsample bootstrap method is needed. Under an extreme value condition, some other estimators for the endpoint have been studied in the literature, which are preferrable to the maximum in regular cases. In this paper, we show that the full sample bootstrap method is consistent for t...