Reaktionen von (Organo)Phosphor‐Sauerstoff‐Verbindungen mit Diorgano‐hydro‐boranen¹⁾

Abstract

Trialkylphosphitc P(0Rh [R = CHI (24, C a H , ~~ Verbindung Redusicrbar NEIN J A J A NEIN NEIN J A Verbindung Rcdusie rbar NEIN NEIN J A J A J A J A~ ) -13351861 "I K.

A Highly Regioselective Palladium-Catalyzed Hydrophosphination of Alkynes Using a Diphosphine−Hydrosilane Binary System

“…This fact indicates the presence of a small amount of oxygen is essential to attain this hydrophosphination with high efficiency . Although tetraphenyldiphosphine ( 1 ) is fairly stable in the solid state, it is extremely air-sensitive in solvent, generating immediately several oxidation products, which can be assigned unambiguously by measurement of their 31 P NMR spectra (in C 6 D 6 ) (Ph 2 PP(O)Ph 2 ( 5 ): δ −23.1 (d, J = 218.0 Hz), 34.6 (d, J = 218.0 Hz); Ph 2 P(O)H ( 6 ): δ 18.0 ppm) (eq ). …”

Electroreduction: A Sustainable and Less Energy‐Intensive Approach Compared to Chemical Reduction for Phosphine Oxide Recycling to Phosphine

“…[71] Köster and co-workers studied another metal-free reduction of secondary diphenyl phosphine oxide in the presence of bis-(9-borabicyclo-[3,3,1]-nonane) (BBN), which gave a free secondary phosphine Ph 2 PH and a protected BBN • Ph 2 PH. [72] Likewise, pinacol borane (HBpin) was also reported to assist in the reduction of phosphine oxides. [33,73,74] Besides the use of borane, calcium, titanium, samarium salt and metal hydride, are also employed in deoxygenation of TPPO.…”

“…Diisobutylaluminumhydride (DIBAL−H) was also shown to effectively reduce secondary phosphine oxides [71] . Köster and co‐workers studied another metal‐free reduction of secondary diphenyl phosphine oxide in the presence of bis‐(9‐borabicyclo‐[3,3,1]‐nonane) (BBN), which gave a free secondary phosphine Ph 2 PH and a protected BBN ⋅ Ph 2 PH [72] . Likewise, pinacol borane (HBpin) was also reported to assist in the reduction of phosphine oxides [33,73,74] .…”