"Phosphorus, Sulfur, and Silicon and the Related Elements"

Steudel, Ralf

doi: 10.1080/10426509208041120pmid: N/A

doi: 10.1080/10426509208041119pmid: N/A

Abstract This is a scanned image of the original Editorial Board page(s) for this issue.

Binder, Herbert; Melidis, Paraschos; Söylemez, Serdar; Heckmann, Gernot

doi: 10.1080/10426509208041121pmid: N/A

Abstract B4H10 reacts with mercaptans by splitting off H2 to form H2B(μ2-SR)2B3H6 III. An unstable adduct B4H10 RSH I was identified as a precursor of III. The 11B NMR spectra of III showed that the B1,3 signals coalesce at 70°C indicating a rapid inversion. On cooling however, the exo-exo, endo-endo and exoendo invertomers were detected.

Johnson, Stephen E.; Hawthorne, M. Frederick

doi: 10.1080/10426509208041122pmid: N/A

Abstract The synthesis and characterization of some ring systems of phosphorus and boron are described. Ring systems of boron such as boroxines, silylboranes, and diborabenzenes are considered. The structural and spectroscopic data for the ring derivatives support varying degrees of electron delocalization, depending on the size of the ring. Ring systems of phosphorus such as phosphenium ions and diphosphorus cations are outlined. The importance of P-C π-bonding interactions and the heterocyclic frameworks in the stabilization of these compounds are highlighted. Finally, new heterocyclic organoboranes are reported, which result from reductions of RBX2 and with alkalai metals. All the rings and their respective derivatives have been characterized spectroscopically and the solid-state structures of some representative members were determined by X-ray crystallography. The degree of delocalization in the pertinent ring complexes are compared with theoretical models.

Dippel, Kerstin; Werner, Elisabeth; Klingebiel, Uwe

doi: 10.1080/10426509208041123pmid: N/A

Abstract Rearrangements occur very frequently in reactions of cyclosilazanes. We have found an equilibrium between the eight-, six-, and four-membered ring anions, which is strongly dependent on thermal and kinetic effects, the choice of substituents and the properties of the attacking group. Knowledge of the interconversion mechanisms has enabled us to prepare silyl-bridged and coupled cyclosilazanes of high molecular weight. These coumpounds are useful precursors of SiN-ceramics.

Jenkner, Peter K.; Hengge, Edwin

doi: 10.1080/10426509208041124pmid: N/A

Abstract The title compound was synthesized by a Wurtz-type condensation of dichlorotetramethyldisilane and trichloromethylsilane under selected conditions. Isolation from a mixture of several other permethylated cyclic, catenated and cage oligosilanes was achieved by RP-HPLC and RP-MPLC methods. ESR - investigations upon chemical reduction were carried out at different temperatures. Reactivity is shown to be distincly different to that of medium-sized monocyclic permethyloligosilanes. The isomeric bi(nonamethylcyclopentasilanyl) was also prepared and pathways to other oligocyclic methylsilanes are shown, starting from monofunctional cyclopentasilanes.

Marsmann, Heinrich C.; Bertling, Edith; Seifert, Meinolf

doi: 10.1080/10426509208041125pmid: N/A

Abstract Cyclic silicic acid esters were characterized by silicon NMR spectroscopy and tested as complexing agents.

Driess, Matthias

doi: 10.1080/10426509208041126pmid: N/A

Abstract A new synthesis of 1,3-diphospha-2,4-disilabicyclo-[1.1.0]butanes and of the novel 1,3-digerrna-2,4-diphosphabicyclo-[1.1.0]butane derivative as well as their exo,endo → exo,exoisomerization are discussed.

Holmes, Robert R.; Day, Roberta O.; Yoshida, Yuji; Holmes, Joan M.

doi: 10.1080/10426509208041127pmid: N/A

Abstract Reaction of phosphorus acids with imidazole and 1-methylimidazole leads to the formation of the hydrogen bonded salts, [(PhO)2PO2][C3H3NHNMe] (1), [(PhO)2PO2][C3N2H2H 5](2), [Cl3CP(OH)O2][C3H3NHNMe]·H2O(3), [Cl3CP(OH)O2][C3N2H5] ·H2O(4), and [PhP(OH)O2][C3N2H5] (5). X-ray analysis reveals that the structure of 1 consists of a hydrogen bonded ion pair, 2 forms hydrogen bonded chains while 3 and 4, which exist as monohydrates, form more complex networks, each possessing twelve-membered hydrogen bonded rings involving alternately water molecules and PO2 units of the phosphonate anion. A correlation is obtained between NH stretching frequency and N-H-X (X = 0, N) hydrogen bond lengths defining strong to intermediate hydrogen bonds useful in refining models for enzyme-substrate interactions.

Forster, Glynis E.; Ingtonm, I. Gary Souther; Sowerby, D. Bryan

doi: 10.1080/10426509208041128pmid: N/A

Abstract Oxidation of diphenylantimony fluoride and thiocyanate with t-butyl hydroperoxide leads to tetrameric products containing a four-membered Sb2O2 ring with a further antimony atom, carrying respectively either two fluorine or two thiocyanate substituents, attached via a single oxygen bridge to each of the ring antimony atoms. This is in contrast to the formation of simple four-membered ring compounds when the corresponding bromide and chloride are oxidised. The reaction between [Ph2SbOBr]2 and silver oxalate is not a simple substitution and the product is a complex salt whose cation contains a planar twelve-membered Sb6O6 ring.