The invention provides a selenium-containing polyimide polymer, preparation method and use thereof. The method comprises: (1) polymerizing a selenide diamine monomer with a dianhydride monomer to give a selenium-containing polyamic acid; and (2) performing thermal imidization on the selenium-containing polyamic acid obtained in the step (1) to give a selenium-containing polyimide polymer. In the invention, selenium is introduced into polyimides for increasing refractive index to 1.7-1.82, this greatly improves the defects of low refractive index of the existing polyimide materials, thereby expanding its applications in the optics field.

Provided are an organic salt represented by Formula 1, a photoresist composition including the same, and a pattern method using the same:

##STR00001##

wherein X.sup.+, Y.sup.?, and R.sub.11 to R.sub.13 in Formula 1 are understood by referring to the specification.

Provided are an organic salt represented by Formula 1, a photoresist composition including the same, and a pattern method using the same:

##STR00001##

wherein X.sup.+, Y.sup.?, and R.sub.11 to R.sub.13 in Formula 1 are understood by referring to the specification.

Novel organoselenium selective ligands are presented and designed to determine metal ions in a sample. These ligands are used as complexing agents in a dispersive liquid-liquid microextraction procedure of copper and zinc ions. The procedure has a shortened extraction time, minimal organic solvent types, and lower amounts of solvents, as well as easy operation and high enrichment efficiency.

Novel organoselenium selective ligands are presented and designed to determine metal ions in a sample. These ligands are used as complexing agents in a dispersive liquid-liquid microextraction procedure of copper and zinc ions. The procedure has a shortened extraction time, minimal organic solvent types, and lower amounts of solvents, as well as easy operation and high enrichment efficiency.

The present invention provides a polysubstituted selenium-containing cyclopent(hex)ene skeleton derivative and a synthesis method thereof. The polysubstituted selenium-containing cyclopent(hex)ene skeleton derivative is prepared by a one-pot method using an arylacetylene compound and an unsaturated selenide reagent as reaction materials, in the presence of a free radical initiator. The synthesis method of the present invention is simple and efficient, requires no metal catalyst, has mild reaction conditions, and has good functional group tolerance and broad substrate scope. Moreover, cyclopent(hex)ene compounds with different substituents are widely present in active drug molecules, and selenium-containing compounds also have good biological activity against tumors, oxidation, inflammation, bacteria, viruses and others. Therefore, a complex selenide-containing cyclopent(hex)ene skeleton derivative is obtained starting from a simple substrate by the synthesis method of the present invention by constructing a CSe bond through a simple, efficient and sustainable strategy. The present invention has broad application prospects.

The present invention provides a polysubstituted selenium-containing cyclopent(hex)ene skeleton derivative and a synthesis method thereof. The polysubstituted selenium-containing cyclopent(hex)ene skeleton derivative is prepared by a one-pot method using an arylacetylene compound and an unsaturated selenide reagent as reaction materials, in the presence of a free radical initiator. The synthesis method of the present invention is simple and efficient, requires no metal catalyst, has mild reaction conditions, and has good functional group tolerance and broad substrate scope. Moreover, cyclopent(hex)ene compounds with different substituents are widely present in active drug molecules, and selenium-containing compounds also have good biological activity against tumors, oxidation, inflammation, bacteria, viruses and others. Therefore, a complex selenide-containing cyclopent(hex)ene skeleton derivative is obtained starting from a simple substrate by the synthesis method of the present invention by constructing a CSe bond through a simple, efficient and sustainable strategy. The present invention has broad application prospects.

A conjugate may have formula (1), i.e., M-[(L1).sub.a-(L2).sub.b-(D).sub.c] (1), wherein M is a biological macromolecule having a nucleophilic functional group, M is linked to L1 with the nucleophilic functional of M, D is a functional molecule, L2 is a linker, and L1 is a compound of formula 1

##STR00001##

wherein R is F or OH, and L2 is linked to R.sub.1, R.sub.3 or R.sub.2, a is an integer of 1 to 10, b, c is each independently an integer of 0 to 10, provided that b and c are not simultaneously 0. R.sub.1, R.sub.2, and R.sub.3, may independently be H, optionally substituted alkyl, or optionally substituted aryl, and R.sub.1, may be H or isotope thereof ? C may link R.sub.1 and a C linking R.sub.2 form a ring.

The present invention relates to a method for coupling two arenes with selenium dioxide to give a selenobiaryl ether. The method of the present invention includes: adding a first arene to the reaction mixture, adding a second arene to the reaction mixture, adding selenium dioxide to the reaction mixture, adding an acid having a pKa in the range from 0 to 5 to the reaction mixture, and adjusting the reaction temperature of the reaction mixture such that the first arene and the second arene are converted to a selenobiaryl ether. The present invention also relates to novel selenobiaryl ethers.

The present invention relates to a method for coupling two arenes with selenium dioxide to give a selenobiaryl ether. The method of the present invention includes: adding a first arene to the reaction mixture, adding a second arene to the reaction mixture, adding selenium dioxide to the reaction mixture, adding an acid having a pKa in the range from 0 to 5 to the reaction mixture, and adjusting the reaction temperature of the reaction mixture such that the first arene and the second arene are converted to a selenobiaryl ether. The present invention also relates to novel selenobiaryl ethers.