The hydroxyl group of (1-hydroxyalkyl)-diphenylphosphine oxides 1 is directly deoxygenated on treatment with phosphorus trichloride and iodides to give parent alkyl-diphenylphosphine oxides 2.
Phosphorus-containing flame-retardant hardener, and epoxy resins cured by the same
申请人:National Science Council
公开号:US20040024255A1
公开(公告)日:2004-02-05
The present invention discloses an active-hydrogen-containing curing agent having a phosphorus group, and a flame retardant cured epoxy resin which can be prepared via an addition reaction between the active hydrogen and the epoxide group of an epoxy resin. The cured flame retardant epoxy resin is environmentally friendly and is suitable for printed circuit board and semiconductor encapsulation applications. The phosphorus group of the curing agent has a chemical structure as follows:
1
wherein Ar is a substituted or un-substituted phenyl or phenoxy.
Disclosed herein is the first protocol for the electrochemically oxidative phosphating of aldehydes and ketones to generate α-hydroxyphosphine oxides with diphenylphosphine as the phosphine source. Various phosphating products containing P–C bonds are basically assembled in modest to excellent yields. This electrochemical phosphating was achieved by utilizing a simple undivided cell with foam nickel