Phosphorus-sulfur rings

The structural types observed for phosphorus-sulfur rings are rather more diverse than for the oxygen congeners. Figme 50 shows representative examples. 

Kyba and his coworkerswere also able to prepare a number of smaller, phosphorus-containing rings and several maeroeyeles containing both sulfur and phosphorus atoms. 

Paritosh, D. R. et al Chem. Abs., 1994, 121, 35869j U.S. Pat. Appl. 42,229 Paritosh, D. R. etal., Phosphorus, Sulfur, Silicon Relat. Elem., 1994, 90(1-4), 175 This and several other compounds with fewer nitro groups and partial replacement of the spiro rings by halogen are patented as explosives. 

PNICTOGEN-CHALCOGEN RINGS 11.7.1 Binary Phosphorus-Sulfur and -Selenium Rings... 

CARBON-NITROGEN-PHOSPHORUS-SULFUR-METAL RINGS... 

The first aliphatic phosphenium cations involving a phosphorus-sulfur bond, e.g. (330) have been prepared and characterised. The stereochemistry, regioselectivity and mechanism of the insertion of the diisopropylamino (chloro) phosphenium cation into the phenylcyclopropane ring, to form phosphetanes, has been studied,Ligand-exchange processes involving mono- and bis-adducts of phosphenium ions have received a theoretical treatment. The coordination chemistry of the carbene adduct (331) of the... 

For reviews on related topics, see a) Bourissou D, Bertrand G (1999) Acc Chem Res 32 561 b) Canac Y, Bourissou D, Gornitzka H, Schoeller WW, Baceiredo A, Bertrand G (1999) Phosphorus Sulfur Silicon 144-146 37 c) Etemad-Moghadam E, Koenig M (1996) Three-membered rings with two heteroatoms including phosphorus to bismuth. In Katritzky AR, Rees CW, Scriven EFV (eds) Comprehensive heterocyclic chemistry II. Pergamon, Oxford, vol 1 a, p 469... 

Phosphorus-containing Ring Systems. - A range of new chiral oxazaphospholidine oxides 266 and 267 have been synthesised and used as catalysts in asymmetric reductions of ketones with diborane. Mannich-type cyclisation reactions of 5-amino-3-benzylthio-4-cyano(ethoxycarbonyl)pyrazoles with dichlorophenylphosphine and aromatic aldehydes in the presence of cation exchange resin have been used to prepare a number of 6-oxo-6-phospha-4,5,6-trihydroimidazolo[l,2-b]pyrazoles, e.g. 268. Some of these compounds have herbicidal activity and this report is typical of a number of similar ones in the Chinese literature. A number of metallocycles, e.g. 269, have been reported as products from reactions of transient zirconocene-benzyne intermediates with phosphaimines followed by sulfuration or selenation. ... 

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