An object of an aspect of the present invention is to provide: a lubricant excellent in adsorbability on the surface of a magnetic disk and in contamination resistance; and a magnetic disk which uses the lubricant and which is excellent in durability. The lubricant in accordance with an aspect of the present invention contains a fluoropolyether compound having, at a terminal thereof, a hydroxyalkenyl group or a hydroxyalkynyl group.

Disclosed is an anti-oxidation stabilizer, which has the following structure (A), wherein R1 is a connection chain, and the connection chain is a fatty chain, an aromatic structural chain or a fatty and aromatic structurally combined chain; R2 is (B), and X is O, S, N or NH or —CONR—, Z is O, S, N or NH, and X is different from Z; R is a fatty chain, an aromatic group, a sterically hindered amine or sterically hindered phenol, R3 is a fatty chain, an aromatic group, a sterically hindered amine or sterically hindered phenol, and R is identical to R3, or R is different from R3; n is a positive integer including 1, n1 is a positive integer including 1, and n is identical to n1, or n is different from n1.

Provided are a method for producing a terminal conjugated dienal compound without an oxidation reaction and a terminal hydroxyacetal compound useful as an intermediate in the method. More specifically, provided are a method for producing an (E)-dienal compound comprising the steps of: a metalation reaction of an alkynal acetal compound (1) to obtain an organic metal compound (2), an addition reaction of (2) to ethylene oxide to obtain a hydroxyalkynal acetal compound (3), a reduction reaction of (3) to obtain an (E)-hydroxyalkenal acetal compound (4), a functional group conversion reaction of (4) to obtain an (E)-alkenal acetal compound (5) having a leaving group X, an elimination reaction of (5) to obtain an (E)-dienal acetal compound (6), and a hydrolysis reaction of (6) to obtain the (E)-dienal compound (7); and others.

##STR00001##

Using a combination of Kumada, Suzuki and Biellmann chemistry, various menaquinones can synthesised rapidly and with stereochemical integrity offering a new way of preparing these vitamin K2 components for the pharmaceutical market. In one embodiment a process for the preparation of a compound of formula (I)

##STR00001## is defined including a step in which (i) a compound of formula (II) is reacted with a compound of formula (III)

##STR00002## wherein R is an alkyl group; LG is a leaving group; m is an integer from 0 to 8; n is an integer of from 0 to 9; and X is hydrogen, halide, hydroxyl or protected hydroxyl; in the presence of a copper, nickel or palladium catalyst.

The invention relates to polyethers, polyamines, and polythioethers, as well as to processes for synthesizing them, e.g., using olefins as starting material.

The invention relates to a method for producing radiation-curable alkenyl ether polyols, to radiation-curable alkenyl ether polyols produced using the method according to the invention, and to the use thereof for the synthesis of radiation-interlinkable oligomers or polymers by means of polyaddition reactions or polycondensation reactions, in particular for the synthesis of radiation-curable polyesters, polyethers, polyurethanes and polyureas, particularly preferably UV-curable polyurethanes. The invention also relates to radiation-curable polyurethane polymers that are obtained by reacting at least one alkenyl ether polyol according to the invention with a polyisocyanate.

Provided is a compound with which a lubricant having excellent adhesion to a magnetic disk, particularly to a protective layer can be provided. A perfluoropolyether compound in accordance with one aspect of this invention has a structure in which two perfluoropolyethers are bonded to each other through an aliphatic ether, the aliphatic ether including a carbon atom to which a primary alcohol is bonded.

The present invention relates to compositions comprising alkene benzenes or alkene benzene sulfonates or alkylbenzenes or alkylbenzene sulfonates; methods for making alkene benzenes or alkene benzene sulfonates or alkylbenzenes or alkylbenzene sulfonates; where the benzene ring is optionally substituted with one or more groups designated R*, where R* is defined herein. More particularly, the present invention relates to compositions comprising 2-phenyl linear alkene benzenes or 2-phenyl linear alkene benzene sulfonates or 2-phenyl linear alkylbenzenes or 2-phenyl linear alkylbenzene sulfonates; methods for making 2-phenyl alkene benzenes or 2-phenyl alkene benzene sulfonates or 2-phenyl alkylbenzenes or 2-phenyl alkylbenzene sulfonates; where the benzene ring is optionally substituted with one or more groups designated R*, where R* is defined herein. This invention also relates to compositions, methods of making, use of, and articles of manufacture comprising 2-ethoxylated hydroxymethylphenyl linear alkyl benzenes. This invention also relates to compositions, methods of making, use of, and articles of manufacture comprising 2-propoxylated hydroxymethylphenyl linear alkyl benzenes.

An unsaturated double bond-containing compound represented by the general formula (I) or the general formula (II), an oxygen absorbent containing the compound, and a resin composition. ##STR00001##

An unsaturated double bond-containing compound represented by the general formula (I) or the general formula (II), an oxygen absorbent containing the compound, and a resin composition. ##STR00001##