2 results about "Propanoyl chloride" patented technology

This invention belongs to the field of pharmaceutical synthesis, specifically relating to a method for preparing etorizine hydrochloride and its intermediates. Specifically, it involves reacting propionyl chloride and ethylbenzene at -80 to -50°C to obtain p-ethylphenylacetone, which is then reacted with piperidine and paraformaldehyde to form a salt, yielding etorizine hydrochloride. The method for preparing p-ethylphenylacetone provided by this invention can obtain a product with a low content of compound II. Using this as a raw material to prepare etorizine hydrochloride simplifies post-processing, improves yield, and ensures that the content of compound III meets pharmacopoeia standards, making it suitable for industrial production.

This invention belongs to the field of functional coatings technology, specifically relating to a waterborne graphene electrothermal coating. The waterborne graphene electrothermal coating comprises component A, component B, and component C. Component A comprises: waterborne hydroxyl acrylic dispersion, deionized water, wetting and dispersing agent, leveling agent, and defoamer. Component B comprises: waterborne isocyanate curing agent and cosolvent. Component C comprises: amino-modified reduced graphene oxide, composite additive, dispersant, and deionized water. The composite additive is prepared by reacting 3,5-bis(tert-butyl)-4-hydroxyphenylpropionyl chloride sequentially with triethylenetetramine and epoxy-modified carbon nanotubes. The amino-modified reduced graphene oxide is prepared by reacting graphene oxide with N-aminoethyl-3-aminopropylmethyldimethoxysilane followed by reduction. The waterborne graphene electrothermal coating prepared by this invention exhibits excellent electrothermal performance and weather resistance.