Analog mixing

As mentioned earlier, chlorates are also a major ingredient in various pyrotechnic formulations. Typically potassium chlorate is utilized in this capacity due to the more hygroscopic nature of the sodium analog. Mixed with powdered aluminum and/or sulfur, potassium chlorate produces a mixture commonly referred... 

Of special interest is the comparison of the inactivity of bipyridine-Cu(II) as a catalyst in salicyl phosphate hydrolysis, with its strong catalytic effect on the hydrolysis of dicarboxyphenyl-2-phosphate. A comparison of formulas XXVII with XXXIV and XXXVI shows that mixed complex formation of Cu+2 with salicyl phosphate and bipyridine would prevent attack of the phosphate group via the proposed mechanism. The formation of the analogous mixed chelate with DCPP (XXXIV and XXXVI) would produce a reaction intermediate for the reaction, since the metal ion would tie up one of the carboxylate ions but leave... 

The parent pyrrolopyrroles (la-lc X = Y = NR) have also not been investigated. Thienopyrroles (la-lc X = S, Y = NR) as well as their benzannelated derivatives have been investigated much more than other analogous mixed azaheteropentalenes. This is probably due to the fact that thieno-[2,3-6]- and -[3,2-6]-pyrrole derivatives are readily available... 

Although several mixed chalcogenides containing S, Se, and Te based on the trimeric ring have been observed in solution by NMR methods (19,175) (Table V), none have so far been isolated. Moreover, no analogous mixed derivatives based on the dimeric structure have been reported. One example of a l-oxa-3-thia-2,4-distannetane (55) is known (779), synthesized by the sequence shown in Eq. (43). The l-thia-2,3-distannirane... 

The final conditions which we found consistently to give a quantitative analysis for carboxylic acids are shown in the Figure 10. Neat thallium ethoxide is a clear, not very viscous or volatile liquid at room temperature and pressure. Simple immersion of the polymer in this tetramer causes rapid penetration and reaction. Excess reagent can be washed out easily with ethanol to leave the thallium label behind. To remove excess ethanol, the sample was left in the vacuum prechamber for 30 minutes before measurement. Some excess oxygen is still seen. The samples are stable and have been found to keep the same thallium level even after being in the spectrometer under X-rays for more than an hour. Much less time is needed for analysis since the cross section is about 12 times that of C(ls). Carboxylic acid salts of thallium are known to be very stable to air, moisture and light (14). Preliminary experiments on an analogous mixed acid/ester system show that the ester functionality is not labeled, while the acid is. 

The analogous mixed arsonium-iodonium ylides (see structure 442 below in Figure 2.16) were synthesized using a similar procedure [574]. Preparation of hetaryl-substituted phosphonium-iodonium ylides was also reported [575]. 

Fig. 8. Comparison of formula volumes for the lanthanide and actinide dihydrides showing volumes characteristic of divalent and trivalent metals. The mixed valence for Yb -I- H (see section 6.6) and possible analogous mixed valency for Cf -I- H are shown as a. After Gibson and Haire (1990).

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