Silicon heterocyclic compounds

The first chapter covers organometallic complexes of boron, silicon, and phosphorus analogs of azoles. This chapter continues the series by A. P. Sadimenko (Fort Hare, South Africa) in which he is treating comprehensively organometallic complexes of heterocyclic compounds. So far, he has covered, in the volumes of AHC indicated, complexes of the following heterocycles ... 

For l,3,2(A2)-diazasilacyclopentene 83, the following Raman lines at 650, 991, 1178, 1566, 1573 cm-1 were reported in the solid state. The intensive doublet at 1566 and 1573 cm-1 was assigned to the (C=C) stretch vibration. The observed bathochromic shift of this band in the spectra of compound 83 compared to heterocyclic compounds having a tetravalent silicon, for example, 93, and the significant intensity enhancement of this band indicates cyclic conjugation in molecule 83 <2000JST329, 2004JA4114>. 

In the chemistry of silicon, heterocycles are rings containing silicon atoms and one or more of another type of atom. Of the isocyclic compounds, four to seven-membered rings are known, while the existence of an eight-membered ring is probable. The same or similar ring sizes are expected for heterocyclic silicon compounds. 

Tributylphosphane telluride donated its tellurium atom to decamethylsilicocene to produce dark-red prisms of a heterocyclic compound with two silicon and three tellurium atoms in the ring. The compound was characterized by single-crystal X-ray diffraction2. 

The chlorine substituents at silicon allow an easy derivatization of 5,6, and 7, e.g., the transformation of 6 into the corresponding hydridosilanes 13 (80 % yield). These cyclopentenyl-diorganohydridosilane are useful precursors for the syntheses of saturated bicyclic heterocycles. Compound 14 was identified as a mixture of exolendo diastereomers (80 20) (Scheme 2). 

By analogy to the formation of 1, heterocyclic silicon chalcogen derivatives can be synthesised by the reaction of bifunctional silicon halogen compounds RR SiCl2 with Na2E (Eq. 3). 

Results of dehydrohalogenation studies are summarized in Table V. Conditions for chlorination with sulfuryl chloride have been reported only for silicon heterocycles. Ring dehydrohalogenation reactions of cyclic germanium compounds have been reported to yield tars 310). 

M. G. Voronkov Silatranes intra-complex heterocyclic compounds of pentacoordinated silicon, pp. 35-59 (85). 

Chenustry of silicon-nitrogen compounds Silicon-nitrogen heterocycles... 

Yuan, C.Y., Li, C.Z., Wang, G.H., and Huang, W.S., New synthetic methods for carbocychc and heterocyclic compounds bearing phosphonate moiety with biological significances. Phosphorus, Sulfur Silicon Relat. Elem., 75, 147, 1993. 

Silicon heterocycles as starting compounds, intermediates, and reaction products 00MI32. 

Cyclic silicon-oxygen compounds (e.g. silaoxa-heterocycles)... 

The regiospecific (3 -t- 2) cycloaddition of the bis(diazomethyl)phosphane (236) with (-butylphos-phaalkyne gives the phosphine (237), substituted by 1,2,4-diazaphosphole units. With dichloro-phenylphosphine (237) condenses smoothly to furnish compound (238), with a 1,3,2,5-diazadiphosphinine unit. An analogous condensation with SiCU results in the spiro-linked silicon heterocycle (239) with a 1,3,5,2-diazaphosphasilabenzene structural unit (Scheme 50) <88TL925>. 

Heterocyclic compounds with a silicon atom and another nonadjacent different heteroatom 06T7951. 

This section contains miscellaneous organic compounds of As, B, P, Si, S, Se, Te, and ammonium and metal salts of their acids, and salts of their bases. See other sections and chapters for further entries of sulfur, phosphorous and silicon compounds and for sulfur heterocyclic compounds see section on Heterocyclic Compounds ,... 

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