22807-80-3Relevant academic research and scientific papers
Acid- and isobutylene-free synthesis of t-butyl ethers by in situ formation of 2-t-butoxy-1-methylpyridinium triflate
Salvati, Anna E.,Hubley, Christian T.,Albiniak, Philip A.
, p. 7133 - 7135 (2014)
The title reagent is formed in situ by alkylation of 2-t-butoxypyrine. The subsequent addition of an alcohol substrate leads to the formation of t-butyl ethers without the need for isobutylene gas or acid activators.
Metallocene supported catalyst and method for preparing polypropylene using the same
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Page/Page column 19, (2020/11/30)
The present invention relates to a supported metallocene catalyst including a novel single metallocene compound having excellent polymerization activity, and a process for producing a polypropylene having excellent processability and broad molecular weigh
Propylene Random Copolymer
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Paragraph 0083-0085, (2020/12/04)
Provided is a propylene random copolymer having excellent processability. The propylene random copolymer according to the present invention may exhibit high stiffness and flexural modulus together with a low shrinkage ratio, thereby being usefully applied
Cosolvent-Promoted O-Benzylation with Silver(I) Oxide: Synthesis of 1′-Benzylated Sucrose Derivatives, Mechanistic Studies, and Scope Investigation
Wang, Lei,Hashidoko, Yasuyuki,Hashimoto, Makoto
, p. 4464 - 4474 (2016/07/06)
A cosolvent-promoted O-benzylation strategy with Ag2O was developed. The cosolvent consisting of CH2Cl2 and n-hexane can not only improve the reaction solubility for carbohydrates but also increase the benzylation efficiency. The formation of byproducts is greatly inhibited in the developed method. This method is simple, mild, and highly effective, and numerous 1′-benzylated sucrose derivatives were prepared including a photoreactive (trifluoromethyl)phenyldiazirine-based sucrose. The mechanisms of benzylation with primary and secondary benzyl bromides were also elaborated. Furthermore, the application scope with alcohols, glucose, and ribose derivatives was investigated.
Synthesis of Cyclo-bis; A Cholaphane with Reduced Flexibility and Externally-directed Functionality
Davis, Anthony P.,Orchard, Michael G.
, p. 919 - 924 (2007/10/02)
A second 'cholaphane' framework is manifested in the title compound 8, which has been prepared from methyl 3α,7α,12α-triacetoxycholanoate 9 in 23percent overall yield.The synthesis involves the Knoevenagel condensation of ketone 11 with malononitrile to g
4-(1-Azi-2,2,2-trifluoroethyl)benzoic Acid, a Highly Photolabile Carbene Generating Label Readily Fixable to Biochemical Agents
Nassal, Michael
, p. 1510 - 1523 (2007/10/02)
The title compound is synthesized starting from either 4-bromobenzyl tert butyldimethylsilyl ether (5b) or 4-bromobenzyl tert-butyl ether (5c) or - most simply - from 4-bromotoluene (5a).In the first step Br was replaced by Li using n-butyllithium, then the organometallic compounds were converted into the respective trifluoroacetophenones 6a - c with N-trifluoroacetylpiperidine.The azi moiety (diazirine) was prepared from the oximes 7a - c via O-tosyloximes 8a - c plus ammonia yielding the diaziridines 9a - c and oxidation of the latter with Ag2O.Oxidation by permanganate - of the ethers after acidic cleavage - yields the title compound 12.On irradation (λ > 300 nm) 12 by elimination of N2 with a half-life period of 22 s generates the corresponding carbene.At the same time from 12 with ca. 20percent the yellow isomeric 4-(1-diazo-2,2,2-trifluoroethyl)benzoic acid (20) is formed which is photolyzed generating the same carbene as 12.The synthesis of 20 is described starting from 4-bromobenzaldehyde. - The diazirine 12 as its N-hydroxysuccinimide ester 13, or using other methods of amide synthesis, can readily be coupled to amino functions of biochemically interesting agents thus forming photoaffinity labels.
