Arsines, aliphatic aromatic

In the ease of mixed aliphatic-aromatic tertiary arsines, the following equations indicate the methods available ... 

The following methods have been used for the isolation of aliphatic-aromatic halogenated arsines —... 

Silver oxide in aqueous suspension converts aliphatic-aromatic tertiary arsine hydroxyhalides to dihydroxides, wliilst picric acid leads to the formation of hydroxypicrates ... 

Mixed Aliphatic-aromatic Ketone Arsinic Acids. —These compounds are formed by the interaction of bromine-substituted mixed aliphatic-aromatic ketones, such as 4-bromoacetophenone or. S-amino-4-bromo-acetophenone, with arsenites in hot solution. 

Gold(I) complexes of the type [AuCl(PPh3)ra] (n= 1, 2) or [Au(N03)(PPh3)] show an excellent performance towards oxidative addition carbonylation or aromatic amines to form corresponding carbamates, and also towards the carbonilation of aliphatic amines to produce either alkylureas or formamides.2552,2553 Cationic gold(I) compounds of the type [AuL]+ where L = phosphine, phosphite, or arsine are excellent catalysts for the addition of alcohols to alkynes.2554... 

It has been found that while the aliphatic arsines and phenyl carbylamine chloride produce a similar turbidity at high concentration (4%), other substances such as mono-, di- and tri-chloromethyl chloroformates, chloropicrin, benzyl bromide, acrolein, the aromatic arsines, thiodiglycol, etc., do not react. 

Most of the aliphatic and aromatic arsines employed during the war of 1914-18 were substances which had been known for some time. The only new substances are the chlorovinyl arsines and phenarsazine chloride, of whose practical efficiency somewhat conflicting opinions are still held. 

There are six types of tertiary aromatic arsines known, if those containing aliphatic radicals are also included ArjAs, ArAr As, ArgAlkAs, ArAlk As, ArAr AlkAs, ArAlkAlk As. For the tyj>e ArjAs, theFittig reaction forms thebasisof a method of preparation, aryl halides and arsenic trihalides reacting in ether or benzene solution in th< ))re-senee of sodium as follows ... 

R represents hydrogen atoms, or aliphatic or aromatic organic radicals and X represents an electronegative atom or radical (F, Cl, Br, I, OH, etc.). Arsenous acid is an example of the most oxidized member of Category I, in which one finds, as derivatives, tetraalkyl arsonium compounds, cacodyl derivatives, and esters of arsenous acids. Arsenic acid is an example of the most oxidized members of Category II, and trimethyl arsine oxide (CHjjjAsO is an example of one of the lowest oxidation states. The practically nontoxic compound arsenobetaine is the main form of arsenic in most species of fish and crustaceans (Edmonds and Francesconi 1988). 

Conversion of aliphatic and aromatic amine N-oxides to corresponding amines, phosphine oxides to phosphines and triaryl arsine oxides to triaryl arsines have also been achieved. These reactions require the presence of HMPA as cosolvent (Zhang and Lin, 1987). 

---