Synthesis of P,P-bidentate caged phosphines via tungsten pentacarbonyl-promoted cycloaddition reactions of 1-alkyl-1,2-diphospholes†
Almaz A.
Zagidullin, 
*a
Yulia S.
Ganushevich,
b
Denis V.
Korchagin,
c
Peter
Lönnecke,
d
Evamarie
Hey-Hawkins
d
and
Vasili A.
Miluykov
a
*a
Yulia S.
Ganushevich,
b
Denis V.
Korchagin,
c
Peter
Lönnecke,
d
Evamarie
Hey-Hawkins
d
and
Vasili A.
Miluykov
a
Abstract
Utilizing the W(CO)5 group as a promoter, we have established a straightforward pathway for the conversion of simple 1-alkyl-1,2-diphospholes to P,P-bidentate caged phosphines via [4+2] cycloaddition reactions. Furthermore, during the course of our investigation, we have observed a rare instance of isomerization, wherein the W(CO)5 migrates between the two phosphorus atoms in pentacarbonyl(1-alkyl-1,2-diphosphole)tungsten(0). This intriguing phenomenon has been thoroughly investigated using variable-temperature 31P NMR spectroscopy.
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