Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Trimethylphosphineoxide, is researched, Molecular C3H9OP, CAS is 676-96-0, about Synthesis of a dinuclear europium(III) complex through deprotonation and oxygen-atom transfer of trimethylamine N-oxide.Electric Literature of C3H9OP.
A dinuclear Eu(III) complex Eu2(OCH2NMe2)2[N(SiMe3)2]4 (1) was synthesized via the reaction of Me3NO and Eu[N(SiMe3)2]3, during which the unprecedented C-H activation of Me3NO occurred along with oxygen-atom transfer. A simple Eu[N(SiMe3)2]3(OPMe3) adduct (2) was obtained when Me3PO was used, which should be due to the higher energy barrier and poorer product stability that prevent the formation of the phosphine substituted analog of 1.
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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem