783 results about "Crown ether" patented technology

A process for producing a fluoroolefin of the formula: CF3CY=CXnHp wherein Y is a hydrogen atom or a halogen atom (i.e., fluorine, chlorine, bromine or iodine); X is a hydrogen atom or a halogen atom (i.e., fluorine, chlorine, bromine or iodine); nand p are integers independently equal to 0, 1 or 2, provided that (n + p) = 2; comprising contacting, in the presence of a phase transfer catalyst, a compound of the formula: CF3C (R<l>aR<2>b) C (R<3>CR<4>d) , wherein R<1>, R<2>, R<3>, and R<4> are independently a hydrogen atom or a halogen selected from the group consisting of fluorine, chlorine, bromine and iodine, provided that at least one of R<1>, R<2>, R<3>, and R<4> is halogen and there is at least one hydrogen and one halogen on adjacent carbon atoms; a and b are independently = 0, 1 or 2 and (a+b) = 2; and c and d are independently = 0, 1, 2 or 3 and (c+d) = 3; and at least one alkali metal hydroxide. The alkali metal hydroxide can be, for example, potassium or sodium hydroxide and the phase transfer catalyst can be, for example, at least one: crown ether such as 18-crown-6 and ls-crown-S; or onium salt such as, quaternary phosphonium salt and quaternary ammonium salt. The olefin is useful, for example, as an intermediate for producing other industrial chemicals and as a monomer for producing oligomers and polymers.

This invention relates generally to synthetic procedures that include the step of ring-opening metathesis of cyclic olefins and reaction with an acyclic diene co-reactant to produce olefin macrocycles by ring expansion, or alternatively. The ring expansion of the cyclic olefin is provided by three types of sequential olefin metathesis (ring-opening, cross, and ring-closing olefin metathesis). More particularly, the invention pertains to synthesis of olefin macrocycles via olefin metathesis reactions using a Group 8 transition metal complex as the metathesis catalyst. Macrocycles provided herein have a variety of uses in the pharmaceutical, biomedical, organic synthesis and chemical industries, such as the production of crown ethers that are useful as metal complexing species.