Linear polyphosphorus compounds

For three-coordinate phosphorus, the best correlations of 5(P) with ring size concern the polyphosphorus compounds, (RP) . The phosphorus chemical shift is approximately linearly correlated with average endocyclic P-P-P bond angles and definite ranges can be established for /i = 5, -1-30 to — lOppm, n = 4, —50 to —80ppm, and = 3, —130 to —180 ppm. The rapid increase in... 

There is also ambiguity concerning the polyphosphorus species formed when (PhP)s is treated with alkali metals in THF solution, but new P n.m.r. data are providing information showing complex dependence on both the metal and the temperature.With potassium, the product is K2(PhP)4, but the data rule out a conventional straight-chain structure and suggest one containing a chelated potassium ion (7). While a similar structure appears to be probable for the disodium compound, the data for Li2(PhP)4 point to an acyclic structure. Similarly, linear structures now seem probable for the M2(PhP)3 species rather than the cyclic dianions considered previously. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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