Arsenic-stabilized alkylation

With the exeption of the alkyl-bis-2,2 -biphenylylenearsoranes 122 whose chemistry and, especially, stability is determined by the spirocyclic bis-2,2 -biphenylylenearso-ranyl part of the molecules, very little is known about alkylarsoranes. Reactions, which at least formally could have led to methyltetraphenylarsorane, (C6H5)4AsCH3, always produced arsenic ylides130>. 

This article will focus on the inorganic chemistry of arsenic rather on the species that feature arsenic carbon bonds, in which the carbon atom is part of an alkyl or aryl group, for example, (3) or (4) (these organoarsenicals may be found in the article see Arsenic Organoarsenic Chemistry). Only a few organoarsenicals are presented to illustrate applications or important species that were stabilized... 

Treatment of 2-chloro-1,3,2-dioxarsinanes (195) with alcohols and phenols in diethyl ether in the presence of excess of triethylamine yields the corresponding alkoxy and phenoxy derivatives (209 R = alkyl, aryl) <76CB493,76ZN(B)190>. Aksnes et al. reported the preparation of several 2-methoxy-and 2-phenoxy-substituted 1,3,2-dioxarsinanes in this way (Scheme 37) <75ACS(A)376,76ACS(A)327>. As a result of the configurational stability at the arsenic atom, nonequiUbrium mixtures of two... 

This polymer has excellent environmental and thermal stability in their neutral and doped states [100, 101] exhibiting optical properties and conductivity values up to 600 S cm in the doped form [102]. Polythiophene presents poor solubility in most organic solvents, except in mixtures such of arsenic trifluoride/pentafluoride which limits its applications. However, it has been reported that the incorporation of a long flexible alkyl side chain on the 3-position of the thiophene ring produces a soluble polymer in common organic solvents without altering the chemical and physical properties of the polymer [103]. 

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