Arsenic rings synthesis

Unsolvated organomagnesium compounds have been recommended for the synthesis of organometallic derivatives of mercury, boron, aluminum, silicon, germanium, tin, phosphorus, arsenic, and antimony6-8 and have been used in procedures for the alkylation of aromatic rings and for the production of various polymerization catalysts.4 9... 

Synthesis and Reactivity of Conjugated and Nonconjugated Rings Containing Arsenic, Antimony, and Bismuth... 

Intramolecular [2n + 27r] cycloadditions leading to cyclobutanes formally belong to valence isomerizations. Alkene/alkcne, ketene/alkene, and allene/alkene cycloadditions have received detailed attention. These rearrangements provide powerful methods for the synthetic arsenal. An example is the facile synthesis of bieyelo[3.2.0]heptenones 3 by intramolecular ketene/alkene cycloaddition after electrocyclic ring opening of cyclobutenoncs l.89... 

Stannacyclopentane, 1,1-dimethylring opening, 1, 608 Stannacyclopentanes, 1, 605-609 chemical properties, 1, 607-608 insertion reactions by sulfodiimides, 1, 608 ring opening, 1, 608 synthesis, 1, 605-607 Stannacyclopent-3-enes synthesis, 1, 616 Stannacyclopropanes synthesis, 1, 581 Stannaindanes formation, 1, 581 7-Stannanorbornadiene decomposition, 1, 619 Stannin, dihydroreplacement of tin with arsenic, antimony or bismuth, 1, 553 Stannoles... 

The synthesis, IR, 19F-NMR, and X-ray crystal and molecular structures of XV have been reported. It is the first well-characterized four-membered As—N ring compound with arsenic atoms of coordination number five. It has been prepared by the following reaction ... 

The chemistry of the E-Hlg (E=As, Sb, Bi) bonds has been featured prominently in the reported chemistry of seven-membered and larger rings containing arsenic, antimony, and bismuth. In work directed toward the synthesis of heterocyclic systems involving transannular Sb N interaction, 64 and 65 have been obtained from chloro-substituted stibocanes 63a by reaction with LiPh in hexane or NaOSiPh3 in toluene. To obtain the NCS-substituted 66, the iodo-substituted stibocanes 63b were reacted with AgSCN in dichloromethane (Equation 2) <1998POL2655>. 

There is a very extensive heterocyclic chemistry of tricoordinate arsenic wherein arsenic is incorporated in four- to ten-membered ring systems. Although the most prevalent synthetic route involves the reaction of a dihaloarsine with a di-Grignard or dilithium reagent, there are many custom syntheses to specific heterocycles. The synthesis and reactivity of the heterocyclic arsenic chemistry will not be reviewed here. Instead, the reader is referred to the comprehensive treatise by Mann and the primary literature that is cited therein. ... 

The chemistry of phospholes and related phospholide anion complexes remains a very active area, which also continues to attract the attentions of the theoretical community. Among recent theoretical contributions are a consideration of the stability, structure and bonding in lithium- and beryl-lium-pentaphospholide systems, the aromaticity of the pentaphospholide anion (and its arsenic analogue) as probed by ring currents,the remarkable influence of fluorine-substitution (either at phosphorus or at a ring carbon) on the electronic and thermochemical properties of phospholes,and the effects of methyl and vinyl substitution at various positions on the geometries, relative stabilities and Diels-Alder reactivities of phospholes. An ab initio approach has been used to reinterprete some spectral and thermochemical properties of IH-phospholes. The synthesis and reactivity of phospholes of reduced... 

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