An object of the present invention is to provide a crystal of a cyclic phosphonic acid sodium salt (2ccPA) with high purity and excellent storage stability and a method for producing the crystal. The present invention provides a crystal of a cyclic phosphonic acid sodium salt (2ccPA) represented by formula (1):

##STR00001##

Provided herein are cyclic phosphorus-containing prodrug compounds, their preparation and their uses, such as treating diseases via modulating molecular targets in the liver.

A compound having a chemical formula according to Formula (I) is disclosed where one of Z.sub.1, Z.sub.2 and Z.sub.3 is and one of the Z.sub.1, Z.sub.2, and Z.sub.3 that is bonded to a carbon atom that is adjacent to the carbon atom bonded to is P(AR.sub.1)(AR.sub.2). Metal-based catalyst and pre-catalysts, such as nickel-based catalysts and precatalysts, where the metal is complexed to the compound are also disclosed. Methods of forming C(sp2)-N bonds are also disclosed.

Described herein are molecules for use in organic light emitting diodes. Example molecules comprise at least one moiety A and at least one moiety D. Values and preferred values of the moieties A and D are described herein. The molecules comprise at least one atom selected from Si, Se, Ge, Sn, P, or As.

Flame retardant synthetic leather having high flame retardancy and excellent physical properties (light resistance, heat resistance and feeling). The flame retardant synthetic leather contains an organic phosphorus compound (component A) represented by the following formula (1). ##STR00001##
(In the formula, X.sup.1 and X.sup.2 are the same or different and each an aromatic substituted alkyl group represented by the following formula (2).)
AL(Ar).sub.n(2)
(In the formula, AL is a branched or linear aliphatic hydrocarbon group having 1 to 5 carbon atoms, and Ar is a phenyl group, naphthyl group or anthryl group, all of which may have a substituent. n is an integer of 1 to 3, and Ar may be bonded to any carbon atom contained in AL.)

An object of the present invention is to provide a crystal of a cyclic phosphonic acid sodium salt (2ccPA) with high purity and excellent storage stability and a method for producing the crystal. The present invention provides a crystal of a cyclic phosphonic acid sodium salt (2ccPA) represented by formula (1): ##STR00001##

The present inventors prepared novel benzoxaphosphole compounds and shown a process for the synthesizing these novel compounds. The process of preparing the compounds is simple, transition metal free and gives product with high yield. The synthesized benzoxaphosphole compounds are expected to show potential biological.

A phosphorous-containing compound is represented by Formula (I): ##STR00001## wherein n is an integer ranging from 1 to 4; R.sup.1 represents hydrogen or a linear or branched C.sub.1-C.sub.4 alkyl group, and a plurality of R.sup.1s are the same or different when n is larger than 1; R.sup.2 represents hydrogen, ##STR00002##
or ##STR00003##
wherein Ep is an epoxy resin moiety; or ##STR00004##
represents ##STR00005##
wherein Ar represents a linear or branched C.sub.1-C.sub.12 alkyl group or a C.sub.6-C.sub.12 aryl group; and R.sup.3 represents hydrogen or methyl.

A phosphorous-containing compound is represented by Formula (I):

##STR00001## wherein n is an integer ranging from 1 to 4; R.sup.1 represents hydrogen or a linear or branched C.sub.1-C.sub.4 alkyl group, and a plurality of R.sup.1s are the same or different when n is larger than 1; R.sup.2 represents hydrogen,

##STR00002##

wherein Ep is an epoxy resin moiety; or

##STR00003##

represents

##STR00004##

wherein Ar represents a linear or branched C.sub.1-C.sub.12 alkyl group or a C.sub.6-C.sub.12 aryl group; and R.sup.3 represents hydrogen or methyl.

Provided herein are cyclic phosphorus-containing prodrug compounds, their preparation and their uses, such as treating diseases via modulating molecular targets in the liver.