On October 8, 2014, Yang, Yonggang; Li, Yi; Li, Baozong; Wang, Qingfeng published a patent.Application of 75449-26-2 The title of the patent was Chiral silsesquioxane containing arylene, manufacture method, and application in absorbent, chiral separation, and asymmetric catalysis. And the patent contained the following:
Title chiral silsesquioxane is homopolymer of I (OEt)3Si(CH2)mNHC(O)NHCH(R)C(O)NH-A-NHC(O)CH(R)NHC(O)NH(CH2)mSi(OEt)3; wherein R is residual group of valine, isoleucine, alanine, or phenylalanine, A is aromatic group of diamine, and m is integer of 3-10. Title manufacture method comprises the steps: (1) reacting Boc-protected amino acid with aromatic diamine to give Boc-protected intermediate; (2) deprotecting Boc group; (3) reacting deprotected intermediate with isocyanate (EtO)3Si(CH2)mNCO (m is integer of 3-10) to give monomer; and (4) polycondensing the monomer to obtain chiral silsesquioxane. Title chiral silsesquioxane has stable chem. property, simple production, and convenient use, has good adsorption effect on aryl compound and heavy metal ion, also has great application value in chiral resolution and asym. catalysis. In an example, I (R = iPr, A = biphenylene, m = 3) was manufactured from Boc-L-valine, 4,4′-diaminobiphenyl, and (3-isocyanato)propyltriethoxysilane; I was polymerized to give right-hand helical fiber with diameter 50-100 nm and length 2-10 μm. The obtained silsesquioxane 50 mg was added to nitrobenzene/cyclohexane solution (volume ratio 1:99) 850 μl; after 5 h, nitrobenzene 19.3 % was absorbed by silsesquioxane, which indicated that the silsesquioxane could be used as absorbent to absorb aromatic compound The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Application of 75449-26-2
The Article related to chiral silsesquioxane arylene manufacture absorbent resolution asym catalysis, Chemistry of Synthetic High Polymers: Organic Condensation and Step Polymerization and other aspects.Application of 75449-26-2