Aryl C-alkylation

Fig. 7.15. Correlation of Si-X distances (empty symbols) and Si-N distances (filled symbols) vs. in silatranes 34, 35 (triangles X = C(aryl), C(alkyl) circles X = OR squares X = F, Cl). Solid curves, see text...

CO(terminal) C(aryl) C(alkyl) C5H5 (centroid of) PMes Cl... 

A. Hydrogenation of Alkenes (and Aryls) B. Formation of Aryls C. Alkylations and Arylations of Alkenes D. Conjugate Reduction of Conjugated Carbonyl Compounds and Niuiles E. Conjugate Alkylations F. Cyclopropanations, including balocyclopropaiiations... 

Diacyl or diaroy] peroxides (36, R- alkyl or aryl respectively) are given specific coverage in reviews by Fujimori,141 Bouillion et c//.,14 and Hiatt.14j They are sources of acyloxy radicals which in turn are sources of aryl or alkyl radicals. Commercially available peroxides of this type include dibenzoyl peroxide (BPO), didodecanoyl or dilauroyl peroxide (LPO), didecanoyl peroxide (42) and succinic acid peroxide (43). 

This chapter covers recent information on the preparation, physical properties, and reactions of quinoxaline and its C-alkyl, C-aryl, iV-alkyl, and A-aryl derivatives as well as their respective ring-reduced analogs. In addition, it includes methods for introducing alkyl or aryl groups (substituted or otherwise) into quinoxalines already bearing substituents and the reactions specific to the alkyl or aryl groups in such compounds. For simplicity, the term alkylquinoxaline in this chapter is intended to include alkyl-, alkenyl-, alkynyl-, and aralkylquinoxalines likewise, arylquino-xaline includes both aryl- and heteroarylquinoxalines. 

ALKYL-l-ALKYNES, 58, 1 ALKYL ARYL SULFIDES, 58,143 Alkyl aryl thioethers, 58,145 Alkylation, enolates, 56, 52 C-ALKYLATION, phase transfer catalysis... 

By analogy with modern routes for the preparation of well-defined polyanilines (D ), palladium-catalysed cross coupling of 1,4-diiodobenzene and primary aryl- and alkyl-phosphines affords the comparatively short chain polymers (66a-c) (Mn= 1000-4000) (Scheme 20), that can be oxidised either by atmospheric... 

A few year later (1980) R. H. Neilson and P. Wisian-Neilson started their long term research project on the preparation of alky, aryl, and alkyl/aryl phosphazene polymers and copolymers [55,56,315-334] prepared in the same way by thermal polymerization of a variety of phosphoranimine derivatives [55, 329, 335, 336] to the corresponding phosphazene macromolecules. The polymers obtained by long heating (several days) at high temperatures (160-220 °C) showed relatively low (about 50,000) molecular weight. 

Rh(TMP)- under these conditions, and in fact the selective activation of methane in benzene solution is a distinctive and unusual feature of this system, given that aryl C—H activation ought to be thermodynamically favored over alkyl C—H activation. The proposed linear transition state proposed in Fig. 8 is the key to this different reactivity. The corresponding trimolecular transition state for an arene would be expected to be bent, and this would be precluded by the bulky TMP... 

C. Alkyl and Aryl Derivatives.—Reactions of organometallic reagents, such as methyl-lithium, with fluorocyclophosphazenes are, in general,... 

Dielectric relaxation studies of phosphorylated polyethers from — 180° to 200 °C have been used to study their structures. The magnitude of the dielectric constants of high-phosphonic-acid-content polymers is much larger than predicted, which suggests a microphase-separated structure. Conductance studies on some aryl- and alkyl-phosphonium salts showed a higher conductance for the halides than for the nitrate. ... 

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