Nucleophilic degradation

Solutions containing the nucleophiles and/or HS dissolve elemental sulfur by reactions according to the following equations (nucleophilic degradation) ... 

The nucleophilic degradation of white phosphorus with lithium... 

Apart from incorporation of a silicon vertex into the decaborane skeleton by salt elimination reactions, the controlled nucleophilic degradation of the disilaborane Me2Si2BioHio with NaOH is another versatile method for the preparation of the nido-silaborate, [MeSiBioHi2], which is depicted in Scheme 3.3-9 [29]. 

Scheme 3.3-9. Nucleophilic degradation of 1,2-dimethyl-l, 2-disila-cIoso-dodecaborane.

Fig. 11.25. Nucleophilic degradation of carboplatin (11.175) by Cl and H20 to yield cispla-tin (11.174) and diaqua-cisplatin [194]...

Scheme 1. Central Role of the S3N3 and S N, Ions in the Reductive or Nucleophilic Degradation...

The nucleophilic degradation of S4N4 by phosphines, e.g. Ph3P, in benzene at reflux was first studied by Krauss and Jung, who isolated Pli3P=N—S3N3 in 11 % yield... 

L. Hough and A. C. Richardson, Oxonium cation intermediates in the nucleophilic degradation of diethyl-sulphonylglycopyranosylmethane derivatives, Proc. Chem. Soc. (1959) 193-194. 

L. Hough and A. C. Richardson, Diethylsulphonyl-(2-0-methyl-a-D-arabopyranosyl)-methane and its behaviour with base, J. Chem. Soc., (1961) 5561-5563 The nucleophilic degradation of diethylsulphonylglycopyranosylmethane derivatives, ibid.. (1962) 1019— 1023 Conformational and electronic factors influencing the nucleophilic degradation of diethylsulphonylglycopyranosylmethane derivatives, ibid.. (1962) 1024-1032. 

The formation of this complex is suggested to occur by an initial formation of the intermediate [(CO)4Mn (PPh2)2C(H)-S6-C(H)(PPh2)2 Mn(CO)4] f(S2)2 (234), arising from a nucleophilic degradation of S8. In support of this mechanism is the formation of 234 by protonation of 233 using HBF4. This process can be reversed by treatment of 234 with KOH. The structure of 233 has been established by X-ray methods (Fig. 70). 

In o-silaborane1 1 (1) the silicon atoms are in the unique situation of being incorporated in the skeleton of a borane cluster framework. We are interested in the reactivity patterns of the icosahedral cluster and especially in the silicon centres. The nucleophilic degradation was the first reaction of o-silaborane which has been enlightened.121 Removal of a silicon vertex from the icosahedral cluster results in almost quantitative isolation of the sila-tiido-undecaborate(l-) (2). This eleven vertex cluster became a versatile starting material for the synthesis of transition metal complexes comprising a silicon metal interaction.13,4 5,61... 

The end-products of the nucleophilic degradation reactions of the tetrameric tetrahalide molecules are the well-known octahedral species XYe (X = Se, Te Y = Cl, Br, I). A large number of salts with... 

These reactions may be used for analysis. The same holds for nucleophilic degradation reactions of polythionates, e.g., the so called sulfite degradation of polythionates ... 

The hexahaloselenates(IV) [SeXe] (X = Cl, Br) are the end-products of the nucleophilic degradation of the tetrahalides (see Figure 14). The more or less ideal octahedral symmetry of these 14-electron SeXeE systems cannot be described using simple models. They had been quoted as exceptions from the VSEPR theory.From spectroscopic and theoretical studies, their bonding, structure, and their dynamic properties are well investigated. 

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