A compound represented by the following general formula (1) is used as a precursor of a graphene nanoribbon: ##STR00001##
where X's are independent of each other and are leaving groups, R's are independent of one another and are hydrogen atoms, fluorine atoms, chlorine atoms, or 1-12C straight-chain, branched-chain, or cyclic alkyl groups, and each of p, q, r, and s is an integer in the range of 0 to 5.

The present invention discloses a nicotinyl alcohol ether derivative, a preparation method therefor, and a pharmaceutical composition and uses thereof. Specifically, the invention relates to nicotinyl alcohol ether derivatives represented by formula (I), a pharmaceutically-acceptable salt thereof, a stereoisomer thereof, a preparation method therefor, a pharmaceutical composition containing the one or more compounds, and uses of the compounds in treating diseases related to PD-1/PD-L1 signal channels, such as cancers, infectious diseases and autoimmune diseases.

##STR00001##

The present invention discloses a nicotinyl alcohol ether derivative, a preparation method therefor, and a pharmaceutical composition and uses thereof. Specifically, the invention relates to nicotinyl alcohol ether derivatives represented by formula (I), a pharmaceutically-acceptable salt thereof, a stereoisomer thereof, a preparation method therefor, a pharmaceutical composition containing the one or more compounds, and uses of the compounds in treating diseases related to PD-1/PD-L1 signal channels, such as cancers, infectious diseases and autoimmune diseases.

##STR00001##

The invention relates to compounds with benzindenofluorene base bodies having a structure of formula (I): ##STR00001##
and to the use thereof in electronic devices, in particular in organic electroluminescent devices.

The invention relates to compounds with benzindenofluorene base bodies having a structure of formula (I): ##STR00001##
and to the use thereof in electronic devices, in particular in organic electroluminescent devices.

Compounds of formula I ##STR00001##
a process for preparation of compounds of formula I; precursor compounds of formula II ##STR00002##
a process for preparation of precursor compounds of formula II; compounds of formula III ##STR00003##
a process for the preparation of compounds of formula IV from compounds of formula III ##STR00004##
and the use of compounds of formula I for the preparation of compounds of formula IV.

The present invention relates to a process to produce compounds of the formula (1) which are suitable for use in electronic devices, as well as to intermediate compounds of formula (Int-1) and compounds of formula (1-1) and (1-2) obtained via the process. These compounds are particularly suitable for use organic electroluminescent devices. The present invention also relate to electronic devices, which comprise these compounds.

The present invention relates to a process to produce compounds of the formula (1) which are suitable for use in electronic devices, as well as to intermediate compounds of formula (Int-1) and compounds of formula (1-1) and (1-2) obtained via the process. These compounds are particularly suitable for use organic electroluminescent devices. The present invention also relate to electronic devices, which comprise these compounds.

A carbon nanobelt represented by formula (1) was synthesized by chemical synthesis:

wherein each Ar is identical or different and represents an aromatic hydrocarbon ring; each R.sup.1 is identical or different and represents hydrogen, alkyl, aryl, or alkoxy; and n represents an integer of 0 or more.

Methods selectively and efficiently produce 3,7-dimethyl-7-octenol and a carboxylic acid ester thereof. More specifically, a method produces 3,7-dimethyl-7-octenol, including steps of: subjecting a 3-methyl-3-butenyl nucleophilic reagent (2) and a 1,3-dihalo-2-methylpropane compound (3) to a coupling reaction to obtain a 2,6-dimethyl-6-heptenyl halide compound (4); converting the compound (4) into a 2,6-dimethyl-6-heptenyl nucleophilic reagent (5); and subjecting the nucleophilic reagent (5) to an addition reaction with at least one electrophilic reagent selected from the group made of formaldehyde, paraformaldehyde and 1,3,5-trioxane, followed by a hydrolysis reaction to obtain 3,7-dimethyl-7-octenol (6); and the other method. ##STR00001##