✍ Scribed by György Keglevich; János Kovács; Tamás Körtvélyesi; Gyula Parlagh; Tímea Imre; Krisztina Ludányi; László Hegedűs; Miklós Hanusz; Kálmán Simon; Andrea Márton; György Marosi; László Tőke
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The [4 + 2] cycloaddition of the double‐bond isomers (A and B) of dihydrophosphinine oxide 1 afforded novel phosphabicyclo[2.2.2]oct‐5‐ene derivates (2–4), formation of which was justified by PM3 semiempirical calculations. The compounds of dimer type (2–4) were utilized in the UV light‐mediated fragmentation‐related phosphinylation of nucleophiles, especially in that of alcohols. To explore the role of structural modifications on the fragmentation ability, disulfide 5, phosphabicyclooctane 7 obtained by the hydrogenation of 2, and the adduct of dihydrophosphinine oxide 1 with benzoquinone (7) were also synthesized and tested in fragmentation. © 2004 Wiley Periodicals, Inc. Heteroatom Chem 15:97–106, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.10221
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## Abstract A series of new P‐methylphenyl P‐heterocycles are introduced. The para and ortho substituted 2,5‐dihydro‐1H‐phosphole oxides (**__1a__** and **__1b__**) were converted to the double‐bond isomers (**__A__** and **__B__**) of 1,2‐dihydrophosphinine oxides (**__3a__** and **__3b__**) via t
A 2-phosphabicyclo[2.2.2]oct-7-ene oxide (2) and a 2-phosphabicyclo[2.2.2]octa-5,7-diene oxide (3) with ethyl substituent on the phosphorus atom was synthesized and their fragmentation properties were studied. The phosphabicyclooctadiene oxide (3) could be utilized in both the UV light-mediated phos