Monophosphorus Compounds

In the exceptional case of the reaction of / -anisoyl chloride with trimethyl phosphite in the presence of / -anisic acid, the product was an unusual monophosphorus compound (equation 20). The formation of this was also rationalized as proceeding through the common phosphonate phosphonium intermediate, the difference being merely in the mode... 

Nozaki and co-workers reported -phospha[7]helicene 99 via palladium-catalyzed C—P bond formation (Scheme 23.39) [47], The cross-coupling of 3,3 -t>iphenanthlyl-2,2 -ylene disulfonate 97 with ethyl phenylphosphinate gave monophosphorus compound 98 as a diastereomer mixture. Reduction of 98, the subsequent palladium-catalyzed intramolecular P-arylation, and oxidation provided X -phospha[7]helicene 99 with a phosphole-oxide moiety. 

In addition to the monophosphorus phosphoryl and thiophosphoryl compounds discussed above, several poly-phosphoryl and -thiophosphoryl halides have been characterized. Pyrophos-phoryl fluoride, 0=PP2—O—P(=0)p2 (mp —0.1°, bp 72° extrap) and the white crystalline cyclic tetramer [0=P(F)—0)4 were... 

In this chapter, we first review the nature of the several forms of elemental phosphorus and then proceed to consider their uses for specific types of syntheses of compounds containing the carbon-phosphorus bond. Prior reviews have also been concerned with these topics.1 2 Our purpose here is to update these presentations and provide fundamentals for the practicing chemist venturing into the use of elemental phosphorus. We limit this discussion to the more-or-less direct syntheses of organophosphorus compounds from elemental phosphorus. We will consider reactions that generate monophosphorus species without C-P bonds as critical intermediates, pro-... 

A few years ago the workers interested in phosphorus compounds felt the need of imiform nomenclature, at least among English-speaking chemists. They foimd what seemed an insurmoimtable obstacle in the different approaches used in naming these compounds. Finally a compromise solution was offered and it was agreed to work on that basis. The rules so far have been limited to monophosphorus compoimds (2). 

Many carbophosphorus ring compounds are known and the monophosphorus varieties include P atoms which are 2-connected as in phosphinine (also known as phosphorin or phosphabenzene) (6.9b), pyramidal as in phosphinane (also known as phosphorinane) (6.9a), tetrahedral as in hydroxyphosphinane oxide (6.9c), or trigonal bipyramidal as in cyclic tetramethylene trifluoro-phosphorane (6.9d). 

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