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2 results about "Cyclen" patented technology
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Cyclen (1,4,7,10-tetraazacyclododecane) is a macrocycle and the aza analog of the crown ether 12-crown-4. Derivatives of cyclen are larger cyclic polyamines but the repeating unit (ethyleneimine, –CH₂CH₂NH–) is always the same. Like crown ethers, cyclen compounds are capable of selectively binding cations. They are used as a ligand in chemistry for instance with chemicals used in MRI contrast agents.
A method for the preparation of cyclen
The present invention discloses a method for the preparation of cyclen (1,4,7,10-tetraazacyclododecane) including one or more of the following steps: • (1) intermediate 1 is reacted with butanedione in the presence of an ether solvent to form intermediate 2, • (2) Intermediate 2 is reacted with glyoxal in the presence of a solvent, a reducing agent and benzotriazole to form intermediate 3.
Owner:MIDAS PHARMA GMBH +1
Etching composition, etching method, and method for manufacturing semiconductor substrate
Provided are an etching composition containing (A) an oxidizing agent; (B) a compound capable of releasing fluoride ions or a salt thereof; (C) at least one amine compound selected from the group consisting of an amine compound (c1) having a specific structure, an amine compound (c2) having a specific structure, an amine compound (c3) having a specific structure, piperazine, 1,5,9-triazacyclododecane, 1,4,7-triazacyclononane, cyclen, cyclam, tetraethylenepentamine, and polyethyleneimine, and derivatives thereof, and (D) a corrosion inhibitor, an etching method, and a method for manufacturing a semiconductor substrate.
Owner:TOKYO OHKA KOGYO CO LTD