The present invention relates to a ring closure reaction useful in synthesizing fused aromatic or heteroaromatic ring systems, which may, for example, be used as organic semiconductor materials.

The invention relates the tetrahydrothiopyranopyrimidine derivatives, the preparation, and the use thereof. The invention contained tetrahydrothiopyranopyrimidine derivatives, and pharmaceutical acceptable salt and prodrug with the formula I or II. Also described here are preparation of tetrahydrothiopyranopyrimidine derivatives, pharmaceutical compositions comprising these compounds as therapy and prevention for HIV.

The present invention describes nitrogen-containing heterocycles substituted by carbazole groups, especially for use in electronic devices. The invention further relates to a process for preparing the compounds of the invention and to electronic devices comprising these.

The present invention describes nitrogen-containing heterocycles substituted by carbazole groups, especially for use in electronic devices. The invention further relates to a process for preparing the compounds of the invention and to electronic devices comprising these.

The invention provides an anthracene-based organic dye and a preparation method thereof. The organic dye provided by the invention has a structure of formula (I) or formula (II), wherein R.sub.a, R.sub.b, and R.sub.2-1 to R.sub.2-4 are as defined herein. The organic dye provided by the invention is obtained by modifying an anthracene with R.sub.a and R.sub.b or modifying anthracene-based groups decorated with an aryl group or a heteroaryl group with R.sub.a and R.sub.b, thereby the power conversion efficiency of a dye sensitized solar cell is significantly improved when the organic dye prepared according to the present invention is applied in a dye-sensitized solar cell. Furthermore, the preparation method of the organic dye according to the present invention is quite simple together with abundant raw materials and low cost, making it possible to be commercialized.

The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound of the present disclosure, it is possible to provide an organic electroluminescent device having excellent thermal stability, low driving voltage, high luminous efficiency, and/or improved lifespan properties.

The invention relates to compounds which are suitable for use in electronic devices, and electronic devices, in particular organic electroluminescent devices, containing said compounds.

The present disclosure relates to an organic electroluminescent compound and an organic electroluminescent device comprising the same. By comprising the organic electroluminescent compound of the present disclosure, an organic electroluminescent device having improved driving voltage, luminous efficiency, and/or lifespan characteristics can be provided.

Circulene compounds of Formula I or Formula II, and organic light emitting devices (OLED) that include an organic layer disposed between an anode and a cathode, wherein the organic layer includes a compound of Formula I or Formula II. In addition, the OLED can be incorporated into one or more of a consumer product, for example, an electronic component module, and/or a lighting panel. ##STR00001##

Circulene compounds of Formula I or Formula II, and organic light emitting devices (OLED) that include an organic layer disposed between an anode and a cathode, wherein the organic layer includes a compound of Formula I or Formula II. In addition, the OLED can be incorporated into one or more of a consumer product, for example, an electronic component module, and/or a lighting panel. ##STR00001##