Transition metals miscellaneous compound

Other miscellaneous compounds that have been used as inhibitors are sulfur and certain sulfur compounds (qv), picryUiydrazyl derivatives, carbon black, and a number of soluble transition-metal salts (151). Both inhibition and acceleration have been reported for styrene polymerized in the presence of oxygen. The complexity of this system has been clearly demonstrated (152). The key reaction is the alternating copolymerization of styrene with oxygen to produce a polyperoxide, which at above 100°C decomposes to initiating alkoxy radicals. Therefore, depending on the temperature, oxygen can inhibit or accelerate the rate of polymerization. 

Miscellaneous. Racemic ketones have been resolved by condensation with (R,R)- or (S,5)-2,3-butanedithiol, then reduced as above to give resolved deoxy compounds (eq 6). Oxidation of prochiral 1,3-dithiolanes under modified Katsuki-Sharpless conditions yields monosulfoxides of high ee. In peptide synthesis, (1) is frequently used as a cation scavenger during deprotection.Transition metal cations are strongly chelated by (1), as exemplified by demetalation of Cu and Ni metalloporphyiins. ... 

Miscellaneous capping agents X are used for LRP. Examples are listed in Scheme 7.2. They include sulfur compounds (Schemes 7.2a and 7.2g), stable nitroxides (7.2b),stable nitrogen and carbon compounds (7.2c),transition metal complexes (7.2d), iodine (7.2e), halogens with transition metal catalysts (7.2f), and tellurium, stibine, and bismuth compounds (7.2h)." ... 

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