2results about How to "Desensitization" patented technology

This invention relates to the field of acyclic or carbocyclic compounds and discloses a method for preparing 6-bromo-2,3-difluorotrifluorotoluene, comprising: dissolving 2,3-difluorotrifluorotoluene in a mixed solvent composed of a polar modifier containing a proton acceptor site and a nonpolar solvent; adding a polyether stabilizer and an iron-based catalyst; and dropwise adding liquid bromine to trigger a directional bromination reaction. The method utilizes the protonated ion-pair complex formed by the in-situ generation of hydrogen bromide and the polar modifier, which, in conjunction with the polyether stabilizer, constructs a sterically hindered shielding structure at positions 4 and 5 of the substrate molecule. This invention forces the electrophilic substitution pathway to be directed towards position 6 of the substrate molecule, overcoming the bottleneck of extremely low positioning accuracy in passivated aromatic ring systems, transforming disordered isomers into a single dominant isomer, thereby reducing separation energy consumption.

The utility model relates to the technical field of underwear mould cup, specifically disclose a high underwear mould cup of close degree, including underwear mould cup main part, the inside of underwear mould cup main part is provided with core support area, and is located underwear mould cup main part's lower edge and side edge area, the inside of underwear mould cup main part is provided with flexible close area, and is located underwear mould cup main part's center and upper edge area, the inside of flexible close area is provided with honeycomb gap structure, this honeycomb gap structure non - through underwear mould cup main part's inside and outside surface The utility model through setting up inside non - through honeycomb gap structure, make flexible close area possess local deformation ability, can fill the chest curve gap closely when static wearing, dynamic activity time self -adaptation deformation reduces displacement, simultaneously, the density / thickness difference of core support area and flexible area realizes the accurate distribution of supporting force and close nature, significantly improves the overall close degree and stability.