Synthesis of sequence-defined oligomers and polymers
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Deprotonation of N-ethylidene-tert-butylamine with lithium diisopropylamide and subsequent condensation with Et trifluoroacetate gives 4-tert-butylamino-1,1,1-trifluorobut-3-en-2-one. An exchange of the amino substituent occurs when the latter compd. is tr ...
A new synthetic strategy for the preparation of highly branched, or dendritic-graft, polypeptides is presented. The synthetic strategy is based on a repetitive sequence of ring-opening copolymerization and deprotection steps. Comonomers for the ring-openin ...
A novel downstream process is reported for preparative scale prodn. of dimeric IgA, a protein with potential pharmaceutical applications. Time-consuming size exclusion chromatog. was replaced by ceramic hydroxyapatite chromatog. (CHT). A clear baseline sep ...
A series of novel, surface-active, inorganometallic complexes of osmium were synthesized and then characterized (using electrochemical techniques) as electron transfer mediators for glucose oxidase (EC 1.1.3.4, GOD) from Aspergillus niger. The mediators co ...
An efficient procedure allowing selective differentiation of the 4-hydroxy group of Me gallate was reported. Me gallate was triacetylated to give 3,4,5-tris(acetyloxy)benzoic acid Me ester which was then regioselectively deacetylated to give the 3,5-tris(a ...
A method is described for copolymg. diallyldimethylammonium chloride (I) with diallyl malonate (II), diallyl fumarate, acrylamide, or a similar monomer to prep. resins which were useful as elec. conducting coatings on paper, as flocculating agents, etc. Th ...
(Akademie der Wissenschaften der DDR, Ger. Dem. Rep.).1977
Supersilyl alk. metals (alkali supersilanides) tBu3SiM without or with donors (Do) like ethers, amines, arom. hydrocarbons are easily obtained by the action of alk. metals M on supersilyl halides tBu3SiX above room temp. in alkanes or donor-solvents like T ...
The aromatic diacid residue 4,6-dibenzofuranbispropionic acid (1) was designed to nucleate a parallel beta-sheet-like structure in small peptides in aqueous solution via a hydrogen-bonded hydrophobic cluster. Even though a 14-membered ring hydrogen bond ne ...
Addition of radicals to silyl ketene acetal followed by cyclization of the radical adducts were used to introduce C-moieties in the 6-endo position of 7-oxabicyclo[2.2.1]hept-5-en-2-one. ...
