Organophosphorus Chemistry by D.W. Allen, J.C. Tebby

By D.W. Allen, J.C. Tebby

"Organophosphorous Chemistry: quantity 31" presents a entire annual assessment of the literature released in this topic among July 1998 and June 1999. insurance comprises phosphines and their Chalcogenides, phosphonium salts, low coordination quantity phosphorus compounds, penta- and hexa- coordinated compounds, phosphazenes and the appliance of actual equipment within the learn of organophosphorus compounds. The sequence could be of worth to investigate staff in universities, executive and commercial study enterprises whose paintings comprises using organophosphorus compounds. It presents a concise yet finished survey pf an enormous box of research, with a large choice of purposes, permitting the reader to quickly retain abreast of the newest advancements of their professional components. expert Periodical reviews offer systematic and special evaluation insurance in significant parts of chemical study. Compiled via groups of major experts within the appropriate topic parts, the sequence creates a distinct carrier for the energetic study chemist, with general, in-depth bills of growth particularly fields of chemistry. topic assurance inside various volumes of a given name is identical and booklet is on an annual or biennial foundation. Now on hand electronically--chapters from volumes released 1998 onwards are actually to be had on-line, totally searchable by way of key be aware, on a pay-to-view foundation. Contents pages could be seen at no cost. stopover at http://www.rsc.org/spr for complete information.

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Thiadiazolylphosphines have been prepared by direct phosphination of the ring system with halogenophosphines19s. (127) R = Ph or Pr' (128) R = PI" or Me A variety of new phosphines has been obtained by elaboration of functional groups already present in precursor phosphines. Acylation of aminoalkylphosphines has provided the chiral diphosphines (129)'96 and (130)197,and Nacylation of chiral pyrrolidinylphosphines has given the new mixed donor ligands (13 1)198 and a water-soluble acrylate polymer-bound system199.

A theoretical consideraton of the species H2PCH has concluded that the ground state of the molecule is best described as a phosphinocarbene rather than a h5-pho~phaacetylene~~~. 5 Phosphirenes, Phospholes and Phosphinines The phosphirene system continues to attract the attention of the theoreticians, the past year having seen studies of insertion reactions of phosphirenium (and phosphiranium) cations with ethene and ethyne510, exchange and insertion reactions involving borane adducts of phosphirene and phosphirane5' I , and a study of the electron affinity of substituted ph~sphirenes~'~.

And six- coordinate hydrido-phosphorus intermediates have been identified by3'P NMR techniques in the reduction of tetraphenylphosphonium salts with lithium aluminium hydride in THF at room temperature. Under these conditions, the phosphorus-containing products are the phosphorane Ph3PH2 and triphenylphosphine. Under reflux conditions, only triphenylphosphine is obtained. Compared with the related quaternary ammonium dication, it is much less easy to incorporate the longchain diphosphonium cation (2 15) into a - c y c l ~ d e x t r i n s ~Clay ~ ~ .

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