Dimethylketene methyl trimethylsilyl acetal
WebDimethylketene methyl trimethylsilyl acetal (TCI, >95.0%) was distilled over calcium hydride under reduced pressure, and a stock solution in dichloromethane was prepared. Dichloromethane (Wako; 99.0%) was dried by passage through solvent purification columns (Glass Contour). Dichloromethane-d 2 (Euriso-Top), ethyl isobutyrate ... Webα-Amino acids were transformed into the corresponding imines; and after the complexes with TiCl 4 were formed, these underwent cycloaddition with dimethylketene methyl trimethylsilyl acetal to give the corresponding β-lactams (Scheme 2) (80TL2081).
Dimethylketene methyl trimethylsilyl acetal
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WebDec 1, 2024 · For example, methyl methacrylate (MMA) was polymerized with dimethylketene methyl trimethylsilyl acetal as the initiator in the −78 to 80 °C range. This addition-polymerization method is known as “group transfer” since the trimethylsilyl group is transferred to the incoming monomer. WebJan 1, 1980 · The reaction of dimethylketene methyl trimethylsilyl acetal with the Schiff bases of chiral α-amino esters in the presence of titanium tetrachloride gave the corresponding β-lactams with extremely high stereoselectivity (up to > 99% diastereomeric purity). Possible mechanism for the highly effective asymmetric induction using “titanium ...
WebDec 14, 2024 · (FAB) paired with LB/initiator dimethylketene methyl trimethylsilyl acetal (MeSKA), which have been employed to execute GTP on a wide range of Michael acceptor-type monomers.44−46 It should be noted here that background polymerization activity was not observed by either FAB or MeSKA, individually, with [M1]/[FAB] or [M1]/[MeSKA] = … WebMethyl trimethylsilyl dimethylketene acetal Write a review 95% Synonym (s): 1-Methoxy-2-methyl-1- (trimethylsiloxy)propene, (1-Methoxy-2-methyl-1 …
WebApr 15, 1994 · The highest yields in the first case were obtained using tetrabutylammonium acetate and dimethylketene methyl trimethylsilyl acetal as catalyst and initiator, respectively, while the use of the corresponding bistrimethylsilyl compound as initiator gave polymers, albeit at lower yields, which carried the acidic end group. WebBuy this product (CAS 31469-15-5), Methyl trimethylsilyl dimethylketene acetal has been used: • in the synthesis of chiral β-lactams by reacting with (S)-alkylidene(1-arylethyl)amines in the presence of titanium tetrachloride • as a catalyst or initiator
WebMar 15, 2024 · This work reveals the silyl ketene acetal (SKA)/B(C6F5)3 Lewis pair-catalyzed room-temperature group transfer polymerization (GTP) of polar acrylic monomers, including methyl linear methacrylate (MMA), and the biorenewable cyclic monomers γ-methyl-α-methylene-γ-butyrolactone (MMBL) and α-methylene-γ-butyrolactone (MBL) as …
WebBuy this product (CAS 31469-15-5), Methyl trimethylsilyl dimethylketene acetal has been used: • in the synthesis of chiral β-lactams by reacting with (S)-alkylidene(1 … brad pitt wife nowWebCAS:41692-15-3 16,16-二甲基前列腺素E1. 16,16-dimethyl Prostaglandin E1. 41692-15-3. C₂₂H₃₈O₅. 查看详细 hac dayton ohioWebHazard Statements. H315 : Causes skin irritation. H319 : Causes serious eye irritation. H226 : Flammable liquid and vapor. Precautionary Statements. P501 : Dispose of contents/ … brad pitt wineryWebTitle: SDBS-NMR-HPM-00-497: Subtitle: 1 H NMR spectrum of dimethylketene methyl trimethylsilyl acetal: Type: data: Subject: Spectral data: Spectral Code: NMR-HPM-00 ... hacd3 t cellWebIn comparison with dimethylketene methyl trimethylsilyl acetal as initiator [2], this new initiator had some differences : higher concentration of initiator was required and 'living' character of GTP strongly depended on the … brad pitt watch adWebFeb 1, 1993 · The addition of the group transfer initiator dimethylketene methyl trimethylsilyl acetal and catalyst tetramethylammonium bibenzoate to a mixture of methyl methacrylate (mma) and methacryloxy-terminated polyisoprene (mac) in tetrahydrofuran resulted in the rapid homopolymerization of the mma. At long reaction times the mac … hacdiskmountWebApr 15, 2001 · Alternate Name: dimethylketene methyl trimethylsilyl acetal. Physical Data: bp 35 °C/15 mmHg; d 0.858 g cm −3. Solubility: freely sol organic solvents. Form Supplied in: clear colorless liquid; 95% pure. Analysis of Reagent Purity: GC and NMR; likely impurities are methyl isobutyrate and hexamethyldisiloxane. hac defined