According to one aspect of the present invention, an organic fluorine compound is represented by a general formula

(R--E-CH.sub.2).sub.2-A(1A)

(where A is a divalent perfluoropolyether group, is an arylene group or a single bond, R is an alkenyl group or an alkynyl group, and E is an ether bond or an ester bond or a group that is represented by a chemical formula

OCH.sub.2CH(OH)CH.sub.2O

two groups each of which is represented by a general formula

R--E-CH.sub.2

may be the same or different, and at least one n among two is an arylene group).

According to one aspect of the present invention, an organic fluorine compound is represented by a general formula

(R--E-CH.sub.2-A-CH.sub.2-E).sub.n--G(1B) (where n is an integer of 2 to 5, A is a divalent perfluoropolyether group, is an arylene group or a single bond, R is an alkenyl group or an alkynyl group, and E and E are each independently an ether bond or an ester bond or a group that is represented by a chemical formula

OCH.sub.2CH(OH)CH.sub.2O

is a group in which n+1 hydrogen atoms are separated from benzene, G is an organic group containing a fullerene skeleton, the n number of groups each of which is represented by a general formula

R--E-CH.sub.2-A-CH.sub.2-E-

may be the same or different, and at least one among the n number of is an arylene group).

A method of producing a polyoxyethylene derivative (1):

##STR00001##

where L1 is a divalent linker, X is a functional group capable of reacting with a physiologically active substance, a is 1 or 2, and n is from 11 to 3,650. The method includes Step (A): protecting 4 or 6 hydroxyl groups in a polyhydric alcohol having 5 or 7 hydroxyl groups by cyclic benzylidene acetalization to obtain a compound having a hydroxyl group at a 1-position and a protective group of a cyclic benzylidene acetal structure; Step (B): polymerizing from 11 to 3,650 moles of ethylene oxide to the compound obtained in the step (A) to obtain a polyoxyethylene derivative; Step (C): converting the hydroxyl group at a terminal of the polyoxyethylene derivative to a functional group capable of reacting with a physiologically active substance; and Step (D): deprotecting the protective group of the polyoxyethylene derivative.

A temozolomide compound according to formula (I) ##STR00001##
is described, wherein R.sup.1, L.sup.1, and X are defined herein. The temozolomide compound can be used to prepare polymers comprising temozolomide. Additionally, the polymers comprising temozolomide can be particularly useful in the treatment of certain diseases.

A temozolomide compound according to formula (I) ##STR00001##
is described, wherein R.sup.1, L.sup.1, and X are defined herein. The temozolomide compound can be used to prepare polymers comprising temozolomide. Additionally, the polymers comprising temozolomide can be particularly useful in the treatment of certain diseases.

A fluorine-containing ether compound represented by the following formula (1) is provided. R.sup.1CH.sub.2R.sup.2CH.sub.2R.sup.3 (1) (In the formula (1), R.sup.1 is an alkoxy group having 1 to 10 carbon atoms, R.sup.2 is a perfluoropolyether chain, R.sup.3 is OCH.sub.2CH(OH)CH.sub.2O(CH.sub.2).sub.mOH (in in the formula is an integer of 2 to 4).)

A method for producing a multi-arm type polyethylene glycol derivative, which includes carrying out the following in order: Step (A): protecting an even number of hydroxyl groups, while leaving only the hydroxyl group at the 1-position of a polyhydric alcohol having an odd number of hydroxyl groups, other than the hydroxyl group at the 1-position by cyclic benzylidene acetalization, Step (B): linking two molecules of the compound obtained in step (A) to a compound for introducing a specific linker by etherification reaction, Step (C): deprotecting the cyclic benzylidene acetal structure at the terminal of the compound obtained in step (B), Step (D): polymerizing 3 to 600 mol of ethylene oxide to each hydroxyl group of the compound obtained in step (C) to obtain a multi-arm type polyethylene glycol derivative, and Step (E): functionalizing the hydroxyl group at the terminal of the multi-arm type polyethylene glycol derivative obtained in step (D).

High temperature lubricants for magnetic media are provided. One such lubricant includes fluoroalkyl, fluoroalkenyl, perfluoroalkyl, or perfluoroalkyl ether segments, anchoring functional groups engageable with a protective overcoat of a magnetic recording media, and cyclic functional groups. The lubricants can be used in conjunction with a magnetic recording medium and/or a magnetic data storage system.

The present invention relates to a curable composition that includes an oxyalkylene polymer A having an average of 4 to 8 terminal groups per molecule and having a reactive silicon group represented by: SiX.sub.aR.sub.3-a (1) (in which R is a monovalent organic group having 1 to 20 carbon atoms and represents an organic group other than a hydrolyzable group, and X represents a halogen atom, a hydroxyl group, or a hydrolyzable group; a is an integer from 1 to 3; when a is 2 or more, X groups may be the same as or different from each other, and when a is 1, R groups may be the same as or different from each other), wherein the terminal group has the reactive silicon group, an unsaturated group, an isocyanate group or an active hydrogen-containing group, and the oxyalkylene polymer A has a hydroxyl group equivalent molecular weight of 500 to 1,750 per terminal group.

The present invention provides isolated nanosheets each of which includes a plurality of pseudo-polyrotaxanes and which are easily isolated without adhering to each other. The present invention provides an isolated nanosheet including a plurality of pseudo-polyrotaxanes each having one or more first cyclic molecules and a linear molecule included in a cavity or cavities of the first cyclic molecules in a skewered manner, wherein the linear molecules include, as part thereof, first linear molecules each having an ionizable group that ionizes in water or an aqueous solution.