A monomer represented by Chemical Formula 1-1 ##STR00001##
wherein in Chemical Formula 1-1, Z, L.sup.1, L.sup.2, R.sup.1 to R.sup.6, n, m, p, and a to f are the same as defined in the detailed description.

Provided are a compound represented by the following Formula I, or a solvate, stereoisomer, or pharmaceutically acceptable salt thereof, and a composition for preventing or treating hair loss, the compound including the compound as an active ingredient:

##STR00001##

Provided are a compound represented by the following Formula I, or a solvate, stereoisomer, or pharmaceutically acceptable salt thereof, and a composition for preventing or treating hair loss, the compound including the compound as an active ingredient:

##STR00001##

The present invention relates to phosphorescent organic light-emitting diodes (OLEDs) comprising a hole-transporting or a hole-transporting and an electron-blocking layer comprising an N,N,N,N-tetraaryl-phenylene-3,5-diamine or an N,N,N,N-tetraaryl-1,1-biphenyl-3,3-diamine matrix compound and to new N,N,N,N-tetraarylsubstituted m-arylene diamine compounds useful as hole-transporting and electron-blocking layer matrices in phosphorescent OLEDs.

A method for preparing a diaryl-p-phenylenediamine compound of Formula I comprises the steps of reacting a compound of Formula II and a compound of Formula III in a condensation dehydrogenation reaction in the presence of a solvent, a hydrogen acceptor, a water-carrying agent, and a catalyst; wherein R.sub.1, R.sub.2 and R.sub.3 are independently selected and each is H, a C1-C8 alkyl, a C3-C8 cycloalkyl, a C1-C8 alkoxy, a C3-C8 cycloalkoxy, or phenyl; a and c are independently selected and each is an integer of 0 to 5, and b is an integer of 0 to 4: ##STR00001##

A method for preparing a diaryl-p-phenylenediamine compound of Formula I comprises the steps of reacting a compound of Formula II and a compound of Formula III in a condensation dehydrogenation reaction in the presence of a solvent, a hydrogen acceptor, a water-carrying agent, and a catalyst; wherein R.sub.1, R.sub.2 and R.sub.3 are independently selected and each is H, a C1-C8 alkyl, a C3-C8 cycloalkyl, a C1-C8 alkoxy, a C3-C8 cycloalkoxy, or phenyl; a and c are independently selected and each is an integer of 0 to 5, and b is an integer of 0 to 4: ##STR00001##

A kit is described that can be used for measuring free chlorine in water. The kit includes a buffer with potassium maleate and an indicator. A method for measuring a concentration of free chlorine in a water system includes adding an indicator and a buffer with potassium maleate to a water sample collected from the water system, measuring a light absorbance of the water sample after the indicator and the buffer have been added to the water sample, and determining a concentration of the free chlorine in the water system based on the measured light absorbance.

A kit is described that can be used for measuring free chlorine in water. The kit includes a buffer with potassium maleate and an indicator. A method for measuring a concentration of free chlorine in a water system includes adding an indicator and a buffer with potassium maleate to a water sample collected from the water system, measuring a light absorbance of the water sample after the indicator and the buffer have been added to the water sample, and determining a concentration of the free chlorine in the water system based on the measured light absorbance.

The present invention addresses the problem of providing a means for making highly sensitive and stable measurements possible using electrochemical measurement methods. This problem is resolved by providing: a labeling substance represented by general formula (1) and used to label a substrate; a measurement substrate that is formed by being labeled using the labeling substance; a method of measuring using electrochemical measurement methods that use the measurement substrate; and a reagent kit that includes as components the labeling substance and/or the measurement substrate.

##STR00001##

(In general formula (1), R.sub.1 is either H or an alkyl group (C.sub.mH.sub.2m+1), m is an integer of 1-4, R.sub.2 is an alkyl group (C.sub.nH.sub.2n+1), and n is an integer of 1-4.)

The present invention addresses the problem of providing a means for making highly sensitive and stable measurements possible using electrochemical measurement methods. This problem is resolved by providing: a labeling substance represented by general formula (1) and used to label a substrate; a measurement substrate that is formed by being labeled using the labeling substance; a method of measuring using electrochemical measurement methods that use the measurement substrate; and a reagent kit that includes as components the labeling substance and/or the measurement substrate.

##STR00001##

(In general formula (1), R.sub.1 is either H or an alkyl group (C.sub.mH.sub.2m+1), m is an integer of 1-4, R.sub.2 is an alkyl group (C.sub.nH.sub.2n+1), and n is an integer of 1-4.)