231 results about "Propyne" patented technology

The instant invention relates to a process and method for manufacturing 2,3,3,3-tetrafluoropropene by dehydrohalogenating a reactant stream of 2-chloro-1,1,1,2-tetrafluoropropane that is substantially free from impurities, particularly halogenated propanes, propenes, and propynes.

The invention relates to a boron fluoride dipyrrole fluorescent dye containing hydrophilic groups and a preparation method thereof. The preparation method comprises the steps of introducing hydrophilic groups to a fluorine atom at 4 bit and fluorine atoms at 2 and 6 bits of BODIPY (boron dipyrromethene dyes) respectively to obtain relatively good water solubility of a whole molecule, wherein the hydrophilic groups are 3-dimethyl amino-1-propyne; enabling 2,4-dimethyl pyrrole to react with aldehyde or acyl chloride containing different substituent groups under catalysis of trifluoroacetic acid according to a molar ratio of 2:1, and then oxidizing by using DDQ (dichloro dicyano quinone) to obtain a basic BODIPY parent structure. The new synthetic method of a quaternary ammonium salt water-soluble BODIPY dye, disclosed by the invention, is simple in reaction condition and relatively high in yield. The BODIPY dye with 3-dimethyl amino-1-propyne groups has a relatively good aggregation property; the obvious aggregation process can be observed in the solution of water and dimethyl sulfoxide; moreover, the fluorescence spectrum of an aggregate has a sharp peak shape, and the strength of the aggregate is extremely high.