The present disclosure provides a styrene derivative and a preparation method thereof, and a modified organic silicone resin and a preparation method and use thereof, and belongs to the technical field of back coating solutions. The styrene derivative is specifically 2,3-difluoro-4-methoxystyrene. A fluorine atom is introduced into a benzene ring structure, and the obtained styrene derivative contains a C—F bond with a relatively high chemical bond energy, such that the styrene derivative has a relatively high thermal stability. The styrene derivative can be introduced into an organic silicone resin to make the obtained modified organic silicone resin have a higher thermal stability. The modified organic silicone resin can be used as a back coating solution to effectively improve a heat resistance of barcode thermal transfer ribbons.

The present disclosure provides a styrene derivative and a preparation method thereof, and a modified organic silicone resin and a preparation method and use thereof, and belongs to the technical field of back coating solutions. The styrene derivative is specifically 2,3-difluoro-4-methoxystyrene. A fluorine atom is introduced into a benzene ring structure, and the obtained styrene derivative contains a C—F bond with a relatively high chemical bond energy, such that the styrene derivative has a relatively high thermal stability. The styrene derivative can be introduced into an organic silicone resin to make the obtained modified organic silicone resin have a higher thermal stability. The modified organic silicone resin can be used as a back coating solution to effectively improve a heat resistance of barcode thermal transfer ribbons.

Disclosed are a salt represented by formula (I), an acid generator, and a resist composition comprising the same:

##STR00001##

wherein R.sup.1 and R.sup.2 each represent a hydroxy group, *—O—R.sup.10, *—O-L.sup.10-CO—O—R.sup.10; L.sup.10 represents an alkanediyl group; R.sup.10 represents an acid-labile group; R.sup.4, R.sup.5, R.sup.7 and R.sup.8 each represent a halogen atom, a haloalkyl group or a hydrocarbon group; A.sup.1 and A.sup.2 each represent a hydrocarbon group, the hydrocarbon group may have a substituent, and —CH.sub.2— included in the hydrocarbon group may be replaced by —O—, —CO—, —S— or —SO.sub.2—; m1 represents an integer of 1 to 5, m2 and m8 represent an integer of 0 to 5, m4, m5 and m7 represent an integer of 0 to 4, 1≤m1+m7≤5, 0≤m2+m8≤5; and AI.sup.− represents an organic anion.

A composition comprising a compound of formula I:

##STR00001##

wherein n is 5, and R is methyl; and
the composition is in an essentially guest-free solid form.

A composition comprising a compound of formula I:

##STR00001##

wherein n is 5, and R is methyl; and
the composition is in an essentially guest-free solid form.

Provided herein, in part, is a new class of sterically bulky, easily prepared N-heterocyclic carbene (NHC) ligands of Formula I, or a salt, solvate, geometric isomer, or stereoisomer thereof. The ligands are readily synthetically accessible exploiting the cost-effective, modular alkylation of anilines. The NHC ligands of the present disclosure can be used to prepare effective catalysts with transition metals, including the compound of Formula II, or a salt, solvate, geometric isomer, or stereoisomer thereof. In certain embodiments, the transition metal is Pd.

Provided herein, in part, is a new class of sterically bulky, easily prepared N-heterocyclic carbene (NHC) ligands of Formula I, or a salt, solvate, geometric isomer, or stereoisomer thereof. The ligands are readily synthetically accessible exploiting the cost-effective, modular alkylation of anilines. The NHC ligands of the present disclosure can be used to prepare effective catalysts with transition metals, including the compound of Formula II, or a salt, solvate, geometric isomer, or stereoisomer thereof. In certain embodiments, the transition metal is Pd.

The present invention relates to a compound of the following formula (I). The invention also relates to uses thereof as a chromophore as such or for building pigments displaying special optical effects, including metal-like reflection. ##STR00001##

Disclosed are novel catechol dditives and the like, methods of preparing, as well as compositions and methods using such compositions in various applications. Also provided is a method of preparing an aqueous coating composition such as a latex paint including the above components.

The present invention relates to a method for the metal-free preparation of a biaryl compound by a photosplicing reaction and its use in the preparation of chemical compounds, preferably of active ingredients e.g. in the fields of pharmaceuticals and agrochemicals. In particular, it refers to a method for the regiocontrolled preparation of a biaryl compound of formula (I): Ar—Ar′ by photochemically reacting a precursor compound of formula (II): Ar—L—Ar′ to form a biaryl compound of general formula: Ar—L—Ar′(II).fwdarw.Ar—Ar′ (I) wherein Ar and Ar′, independently of each other, represent an unsubstituted or substituted C6-C20 aryl group or a heteroaryl group with 5-20 ring atoms selected from carbon, nitrogen, oxygen and sulfur, and L represents a group —X—Y—Z— as defined herein. The biaryl compounds are generally suitable as intermediates or key building blocks in a very broad spectrum of organic chemical syntheses and their respective utilities. Their use within the field of synthesis of active ingredients is an aspect of the invention, and their use in the preparation of pharmaceutically active ingredients is particularly preferred.