Ring opening of a sterically crowded 1,2-oxaphosphetane complex

Area of Science:

• Organophosphorus Chemistry
• Organometallic Chemistry
• Synthetic Organic Chemistry

Background:

• 1,2-oxaphosphetanes are four-membered rings containing phosphorus and oxygen.
• Their ring opening reactions are important for synthesizing various organophosphorus compounds.
• Limited examples of 1,2-oxaphosphetane complex ring opening exist.

Purpose of the Study:

• To report the first ring opening reaction of a 1,2-oxaphosphetane complex.
• To synthesize a C-OH functional phosphinito complex.
• To explore the utility of the synthesized phosphinito complex in subsequent ring-forming reactions.

Main Methods:

• Reaction of a 1,2-oxaphosphetane complex with water in the presence of [Li(12-crown-4)]Cl.
• Isolation and characterization of the resulting phosphinito complex.
• Subsequent reactions of the phosphinito complex with Me2ECl2 (E = Si, Ge) and various nitrogen bases.

Main Results:

• The first example of a water-induced ring opening of a 1,2-oxaphosphetane complex was achieved.
• A novel C-OH functional phosphinito complex was successfully synthesized.
• The phosphinito complex demonstrated reactivity in ring-forming reactions with silicon and germanium precursors.

Conclusions:

• The study establishes a new synthetic route involving 1,2-oxaphosphetane ring opening.
• The synthesized phosphinito complex serves as a versatile intermediate for constructing new organophosphorus compounds.
• This work expands the known reactivity of 1,2-oxaphosphetane complexes in synthetic chemistry.