The present invention provides a process for the preparation of mono- and bisacylphosphanes based on formula (I): ##STR00001##
as well as for their corresponding oxides or sulfides. The present invention further relates to photoinitiators obtainable by said process.

The present disclosure provides a method for preparing ((2,2-dimethyl-1,3-dioxane-5,5-diyl)bis(methylene))bis(bis(2-methoxyphenyl)phosphine), a ligand for a polyketone polymerization catalyst, under mild conditions with high purity and high yield. Therefore, the preparation method of the present disclosure can be easily applied to mass production.

The present disclosure provides a phosphorus-containing compound represented by Formula (1), a resin composition comprising the phosphorus-containing compound, and an article made from the resin composition. The phosphorus-containing compound can achieve halogen-free flame retardancy while satisfying the requirements of excellent dielectricity, high copper foil peeling strength, high glass transition temperature, low percent thermal expansion and excellent heat resistance after moisture absorption. The resin composition comprises the following components or a prepolymer thereof: (A) 100 parts by weight of an unsaturated C?C double bond-containing polyphenylene ether resin; and (B) 15 parts by weight to 90 parts by weight of the phosphorus-containing compound represented by Formula (1); wherein the prepolymer is obtained from a mixture through prepolymerization, and the mixture comprises at least the component (A) and the component (B).

##STR00001##

P-chirogenic organophosphorus compounds of general formula (I), a process for the synthesis of the compounds of formula (I), and intermediate products of general formulae (II), (III) and (IV), as shown below, are involved in the synthesis of compounds (I). ##STR00001## Metal complexes comprising compounds (I) as ligands are also described. The compounds and complexes are useful in asymmetric catalysis by transition metal complexes or organocatalysis, especially for asymmetric hydrogenation or allylation. Compounds of general formula (I) may be useful as agrochemical and therapeutic substances, or as reagents or intermediates for fine chemistry.

The present invention provides a process for the preparation of mono- and bisacylphosphanes based on formula (I): ##STR00001##
as well as for their corresponding oxides or sulfides. The present invention further relates to photoinitiators obtainable by said process.

The disclosure is directed to: (a) phosphacycle ligands; (b) catalyst compositions comprising phosphacycle ligands; and (c) methods of using such phosphacycle ligands and catalyst compositions in bond forming reactions.

The present disclosure provides a phosphorus-containing compound represented by Formula (1), a resin composition comprising the phosphorus-containing compound, and an article made from the resin composition. The phosphorus-containing compound can achieve halogen-free flame retardancy while satisfying the requirements of excellent dielectricity, high copper foil peeling strength, high glass transition temperature, low percent thermal expansion and excellent heat resistance after moisture absorption. The resin composition comprises the following components or a prepolymer thereof: (A) 100 parts by weight of an unsaturated CC double bond-containing polyphenylene ether resin; and (B) 15 parts by weight to 90 parts by weight of the phosphorus-containing compound represented by Formula (1); wherein the prepolymer is obtained from a mixture through prepolymerization, and the mixture comprises at least the component (A) and the component (B). ##STR00001##