By Alan R. Katritzky
(from preface)Volume forty seven of Advances in Heterocyciic Chemistry is, in contrast to such a lot volumes, a monograph and bargains with the quantitative points of electro-philic substitution of heterocycles. it really is written via Roger Taylor of the college of Sussex, Brighton, England, and your editor with one bankruptcy contributed by way of Ross Grimmett of the collage of Otago in New Zealand. it truly is was hoping that this survey of the total sector of electrophilic substitution of heterocycles, masking because it does semiqualitative in addition to thoroughly quantitative points, might be of substantial support to staff within the field.As is common for volumes of our sequence, no topic index is integrated. as a substitute, there's a very specified contents from which we think it is going to be attainable to trace down so much issues. in fact, this quantity could be listed in quantity fifty one. on the way to be the subsequent ''index volume'' of the sequence and should conceal Volumes 46-50, simply as quantity forty six lined Volumes 41-45 and quantity forty coated Volumes 1-40.
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Extra resources for Advances in Heterocyclic Chemistry
This is particularly appropriate for the less soluble benzenoid compounds (6OJCS3301; 61JCS247; 61JCS4927). The labeled substrates are usually prepared from the bromo compounds by formation of the Grignard (or lithium) reagent, and hydrolysis of this with tritiated water (6OJCS3301;75TL435). Protiodetritiation has also been the reaction of choice for determination, with high accuracy, of rates of exchange in trifluoroacetic acid at 70°C; -350 partial rate factors are available under this condition.
Sec. G] 29 ACID-CATALYZED EXCHANGE c . Procedure for Determining Standard Rates for Deuteriation The procedure for determining $ (lWC) at pH requires the following steps [73JCS(P2)10651. = 0 is complex and (1) The value of the acidity function at T ("C), the effect of dissolved substrate on this value, and the effect of using D,SO, instead of H,SO, must be determined. (2) The rate versus acidity profile must be constructed and extrapolated to pH = 0. (3) The variation of rate with temperature must be measured.
The mixture is then shaken vigorously for 10 min in a tightly stoppered long-necked conical flask (300 ml) to allow complete dissolution. In some cases, mixtures of acetic acid and sulfuric acid have been used in this method (61JCS247) and trifluoroacetic acid has also been employed to dissolve the aromatic before adding the sulfuric acid. ] Equal volumes of the solution (50 ml) are pipetted into ampoules of volume 3 5 3 ml, which are sealed with teflon-sleeved quickfit joints and placed in a thermostatted bath.