2,4-bis(2,6-di-t-alkyl-4-substituted-phenoxy)-1,3,2,4-dioxadiphosphetanes are prepared from 2,4,6-tris(substituted phenoxy)-1,3,5,2,4,6-trioxatriphosphorinanes.
Experiments on the generation of 2-coordinate phosphoryl species by fragmentation of 7-phosphanorbornene and 3-phospholene derivatives
作者:Louis D. Quin、Stefan Jankowski、Juliusz Rudzinski、Anthony G. Sommese、Xiao Ping Wu
DOI:10.1021/jo00075a014
日期:1993.11
2,6-Di-tert-butyl-4-methylphenylphosphenite (ArOP=O) was released into the gas phase on heating a neat sample of a 7-phosphanorbornene derivative 6 bearing this aryloxy substituent at 300-degrees-C (0.01 mm). Attempts to prepare 1-adamantyl phosphenite similarly were not successful. Irradiation of 6 in 1,2-dichloroethane at 254 nm failed to cause release of the phosphenite, but when some alcohol was present fragmentation proceeded readily to give the H-phosphonate (ArOPH(O)OR). It was deduced that the species undergoing the fragmentation was a 5-coordinate adduct of 6 and the alcohol. Similar behavior was observed for the other esters and also for a P-phenyl oxide and a P-phenyl sulfide in the 7-phosphanorbornene series, as well as for a 3-phospholene oxide. Isotope exchange experiments with (OH2)-O-18 proved the influence of the irradiation on the formation and fragmentation of the 5-coordinate adduct. Earlier literature reports that 2-coordinate species are released on irradiation of 7-phosphanorbornene and 3-phospholene derivatives therefore need reinterpretation.
Thermal Retro-Trimerization of Some 1,3,5,2,4,6-Trioxatriphosphorinanes to Phosphenites
作者:Louis D. Quin、Alexey S. Ionkin
DOI:10.1021/jo00121a042
日期:1995.8
Pyrolysis in a packed tube of the vapor from three 2,4,6-tris(aryloxy)-1,3,5,2,4,6-trioxatriphosphorinanes was performed at 300-350 degrees C and 10(-6) mm; the product was collected on a cold finger chilled by liquid nitrogen. The cracking of the trimer was complete, and the product at -195 degrees C appeared to consist only of the monomeric aryl phosphenite, ArOP=O. On warming, dimerization occurred, later followed by trimer formation. The weak P-31 MMR signal for the phosphenite (about delta 238 for three O-aryl derivatives) persisted in the solution for several weeks if water was rigorously excluded. Treatment of the phosphenite with water or alcohols at -195 degrees C gave a mixture of products; the major product (ArO-PH(O)OH) came from addition of the nucleophile to the P=O bond, but significant amounts (10-20%) of dialkyl H-phosphonates (HP(O)(OR)(2)) were present, apparently from displacement of the O-aryl substituent of the phosphenite, followed by addition to the double bond.
Synthesis and structure of 2,4-bis(2,6-di-tert-butyl-4-methylphenoxy)-1,3,2,4-dioxadiphosphetane. An aryl phosphenite dimer
作者:Dwight W. Chasar、John P. Fackler、Richard A. Komoroski、William J. Kroenke、Anthony M. Mazany
DOI:10.1021/ja00253a020
日期:1987.9
Quin Louis D., Jankowski Stefan, Rudzinski Juliusz, Sommese Anthony G., W+, J. Org. Chem, 58 (1993) N 23, S 6212-6216
作者:Quin Louis D., Jankowski Stefan, Rudzinski Juliusz, Sommese Anthony G., W+