Antimony derivatives

The eight-membered rings 13.14 normally adopt boat conformations in the solid state with short S=N bond distances (1.51-1.52 A) that are typical of sulfur diimides. There are no transannular S S contacts. The sole exception is the antimony derivative BuSb(NSN)2Sb Bu, which is a planar eight-membered ring. 

As with the previous element, the dangerous reactions of antimony derivatives are linked to the behaviour of the anion. The element is reducing and apart from its interaction with two metals it gives rise to dangerous reactions with strong oxidants. 

The phosphorus chemical shift observed for the arsenic derivative 5 P = 315 is in accordance with the monomeric structure (39). This, however, is not the case for that observed for the antimony derivative, P = 44.5. The mass spectrum of the latter confirms its dimeric structure (37). 

Mes N=AsCl in dichloromethane (Section 11.1.2 and Scheme 11.1). The antimony derivative (Mes N=SbOTf)2 exists as a dimer that does not dissociate, indicating that the larger Sb2N2 ring is better able to accommodate the steric strain imposed by bulky Mes groups than an AS2N2 ring. 

Strongly Lewis acidic SbCl5 rapidly reacts with one equivalent of the cyclopropane 16 in chloroform to give monoalkylated antimony derivate 18 in 87% yield Eq. (20) [11]. The internal chelation is especially strong, as indicated by the carbonyl band in the IR spectrum at 1600 cm-1. In contrast to the common monoalkyltetrachloroantimony, the chelated homoenolate 18 is stable at room temperature for many hours. 

Melarsen (211) is active against both early and late stages of African trypanosomiasis. The antimony derivative (212) is used similarly (B-61MI22000, p. 715). 2,4,6-Tripyridyl-l,3,5-triazine forms a purple bis(triazinyl) complex with iron(III) ions which provides a spec-trophotometric method for estimating iron in wines (59MI22001). 

One type of this class of compound exists, namely, the cubic cluster species [E4Co4(CO)l2] (150, E = Sb 151, E = Bi) (see Fig. 42). The antimony derivative was reported by Dahl (145) as resulting from a high-temperature and... 

The first structurally characterized antimony derivatives of tripodal ligands such as tris(aminoethyl)amines, N[CH2CH2N(R)H]3, named azastibatranes, were obtained from the reaction between tetramines and tris(dialkylami-no)stibine. Thus, treatment of [N(CH2CH2N(Me)H] with Sb(NEt2)3 led to 16a isolated as a colorless oil in 95% yield. 

Reactions of Silicon-Phosphorus, -Arsenic, and -Antimony Derivatives... 

SYNS ANTHIOLIMINE ANTHIOMALINE UTHIUM ANTIMONIOTHIOMALATE MERCAPTO-SUCCINIC ACID ANTIMONATE(III) HEXAUTHIUM SALT MERCAPTOSUCCINIC ACID-S-ANTIMONY DERIVATIVE LITHIUM SALT MERCAPTOSUCCINIC ACID,THIOANTIMONATE(III), DIUTHIUM SALT 2,2, 2"-(STIBILIDYNETRIS(THIO))TRIS-BUTANEDIOIC ACID HEXALITHIUM SALT... 

Main group element derivatives containing three or four ferrocenyl thiolate ligands are accessible from the corresponding element chlorides and Fc-SLi. Thus, the reaction of PCI3 with a suspension of 3 equivalents Fc-SLi in toluene — THF (3 1) leads to tris(ferrocenyl thiolato) phosphine, P(SFc)3 the oxide and sulfide, P(0)(SFc)3 and P(S)(SFc)3, are formed as side-products in addition to Fc-SS-Fc. The corresponding tris (ferrocenyl thiolato) element compounds As(SFc)3 and Sb(SFc)3 are also known the antimony derivative decomposes under the influence of either air or light [235]. 

The antimony derivative of 2 S J.-trihydroxybenzaIdehyde when treated with Salvarsan in aqueous hydrochloric acid solution, gives the diantimonyl derivative of di-2 3 i-trihydroxyhen yiidene-S S -diamino-4 i -dihydro.njarsenobe zene, which is deep orange. ... 

This compound is prepared in a similar manner to the corresponding antimony derivative (p. 488), bismuth trichloride taking the place of the antimony trichloride. The substance has a similar solubility to the antimony compound, but is black in colour. Its aqueous solutions are decomposed on boiling, and hydrogen peroxide in alkaline solution... 

Arsinidene and stibinidene complexes. Arsenic and antimony in their +1 oxidation state can be stabilized by a metal-arsenic (or antimony) n bond with a trigonal planar coordination. PhE[Mn(CO)2Cp]2 was prepared as its arsenic " and antimony derivatives . 

B. Stable Isotope Syntheses and Applications of Antimony Derivatives. . 596... 

The pentadeuteriophenylated antimony derivatives (Cg H5)Sb(SCH,CH2)2X of the general structure 24, where X = O or X = S, have been synthesized in five steps, as shown in equation 36, starting with perdeuterated nitrobenzene. The I.R. and Raman spectra of cyclic dithiolates 24 have been determined in the 3200-100 cmregion. The... 

The method has been used for the preparation of antimony derivatives (equation 45) However, the method has not been used frequently in recent years. 

Importantly, the antimony derivative (ArsSbOfn does not undergo similar reactions. 

A further antimony derivative, namely, bis-(para-methoxyphenyl) boryl hexachloroantimonate [prepared in situ from antimony pentachlo-ride and bis-(para-methoxyphenyl)boryl chloride] can be utilized (25% mol) in the acylation of anisole and veratrole with acetone acyl enolates in 52%-88% yield. The major advantage of the method resides in the possibility of performing Friedel-Crafts acylation at room temperature in a reaction medium that can be kept almost neutral throughout the reaction, acetone being the only co-product. 

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