A phospholipid derivative represented by the following formula (I) wherein R.sup.1CO and R.sup.2CO independently represent an acyl group; R.sup.3 represents hydrogen atom, or a hydrocarbon group; symbol "a" represents an integer of 0 to 4; symbol "b" represents 0 or 1, provided that when a is 0, b is 0; X represents hydrogen atom, an alkali metal atom, an ammonium, or an organic ammonium; A.sup.1O and A.sup.3O represent an oxyalkylene group containing oxyethylene group, wherein the ratio of the ...

A process is provided for the preparation of 9,10-dihydro-9-oxa-10-organyloxyphosphaphenanthrene-10-oxide or -thione and derivatives of same substituted on the phenyl groups, in which: (a) 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOP) or a derivative of same is reacted in the presence of at least one mono- or polyhydric alcohol with at least one ortho ester with formation of a first intermediate product, (b) the intermediate product from step (a) is optionally reacted with at least on...

Disclosed is a process for making a thiophosphine compound of formula (I): ##STR00001## wherein X represents SH or ##STR00002## with R.sub.1 being H or --CH.sub.3, R and R' represent, independently from each other, an alkyl radical, an alkoxy radical, an aryl radical or a phenyl radical which may be substituted with one or more alkyl and/or alkoxy groups, n is an integer from 0 to 4, n' is an integer from 0 to 5, x is an integer from 0 to 2, y is an integer from 1 to 5 with the proviso that y+n ...

Process for preparing an alkenylphosphonic acid derivative by reacting a phosphonic acid derivative with an alkyne in the presence of a catalyst complex system, wherein the catalyst complex system comprises (a) nickel, (b) a phosphine having at least two trivalent phosphorus atoms and in addition (c) a phosphine having one trivalent phosphorus atom.

A process for preparing alendronate sodium includes the reaction of gammabutyric acid with phosphorous acid and phosphorus trichioride and subsequent treatment with an aqueous solution of an alkali metal hydroxide, in which the reaction is conducted in liquid ionic solvents.

A process for producing a high-purity hafnium amide includes the steps of (a) adding a compound which contains a carbonyl group or sulfonyl group and is represented by the formula of A(O.sub.yXO.sub.nR.sub.f).sub.m (e.g., CF.sub.3SO.sub.3H, Hf(CF.sub.3SO.sub.3).sub.4, (CF.sub.3SO.sub.2).sub.2O, CF.sub.3CO.sub.2H, CH.sub.3SO.sub.3H, C.sub.6H.sub.5SO.sub.3H, and (CH.sub.3SO.sub.2).sub.2O), to a crude hafnium amide which is represented by the formula of Hf[N(R.sub.1)(R.sub.2)].sub.4, where each of ...

In general terms, the present invention includes a process for producing a new zinc dialkyldithiophosphate (ZDDP) offering improved seal compatibility characteristics in engine and transmission oil packages. The present invention additionally includes zinc dialkyldithiophosphate produced in accordance with the disclosed methodologies, and oil additives, lubricants, and engines and transmission comprising the zinc dialkyldithiophosphate of the present invention.

Classes of molecules are disclosed which can, for example, be used in molecular switches. The classes of molecules include at least three segments--an electronic donor ("D"), a switchable bridge ("B"), and an electronic acceptor ("A")--chemically connected and linearly arranged (e.g., D-B-A). The electronic donor can be an aromatic ring system with at least one electron donating group covalently attached; an aromatic ring system with an electron withdrawing group covalently attached is usually e...

Platinum 1,3-diketo compounds are prepared by stirring a dichloroplatinum compound and a diketo compound in a keto solvent at below 10.degree. C. for from 5 minutes to 90 minutes and isolating the reaction product. The product is obtained in high purity suitable for use as a catalyst for preparing polymer articles suitable for use in the medical and food industries.

There is provided a process for preparing a carboxylic acid ester of formula (3): R.sup.2COOR.sup.1 (3) wherein R.sup.1 is an alkyl group which may be substituted, an alkenyl group which may be substituted, an alkynyl group which may be substituted, an aralkyl group which may be substituted, or a heteroarylalkyl group which may be substituted, and R.sup.2 is an alkyl group which may be substituted, an alkenyl group which may be substituted, an alkynyl group which may be substituted, an aryl grou...