29003-73-4Relevant academic research and scientific papers
Multifactor Control of Vinyl Monomer Sequence, Molecular Weight, and Tacticity via Iterative Radical Additions and Olefin Metathesis Reactions
Miyajima, Masato,Satoh, Kotaro,Horibe, Takahiro,Ishihara, Kazuaki,Kamigaito, Masami
, p. 18955 - 18962 (2020)
Monomer sequence control in terms of a single monomer unit, particularly in vinyl polymers, is one of the largest challenges in polymer chemistry. Furthermore, multifactor control of monomer sequence, molecular weight, and stereoregularity is an ultimate goal. In this work, we propose a strategy to prepare C-C main-chain sequence-regulated polymers with controlled molecular weights from vinyl monomers via a combination of iterative atom transfer radical additions and olefin metathesis reactions. This strategy enabled the synthesis of sequence-regulated polymers with exact styrene-acrylate-styrene sequences in the C-C main chains, controlled molecular weights of up to 104, and stereoregularities varying with syndiotacticity, isotacticity, and heterotacticity. The utility of this strategy is further demonstrated by formation of block copolymers consisting of sequence-regulated vinyl polymer segments by combining living ROMP of norbornene derivatives.
METHOD FOR PRODUCING CARBONATE COMPOUND AND METHOD FOR PRODUCING AROMATIC POLYCARBONATE
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Paragraph 0181-0183, (2015/06/10)
The present invention relates to a method for producing a carbonate compound containing: a first step of reacting a compound represented by the following Formula (1) with a compound represented by the following Formula (21) or a compound represented by the following Formula (22) to obtain a reaction mixture containing a carbonate compound, and a second step of bringing the reaction mixture containing a carbonate compound into contact with a strongly basic compound, in which R1 represents a monovalent organic group, and R2 represents a divalent organic group.
Synthesis of some alkyl acetates from alcohols catalyzed by H 5PW10V2O40and H5PMo 10V2O40 under microwave irradiation(Part 2)
Tayebee, Reza,Zonoz, Farokhzad Mohammadi
experimental part, p. 541 - 545 (2011/09/16)
The protection of alcohols under the environmentally benign microwave approach by the mediation of H5PMo10V2O40 and H5PW10V2O40 as vanadium-containing mixed-addenda heteropolyoxometalates with Keggin primary structure was investigated. The influence of microwave power on the progress of 1-butanol acetylation with acetic acid in the presence of a catalytic amount of H5PW10V2O40 has also been studied. To study the recycle ability and stability of the catalyst, H5PW10V2O40 was regenerated at the end of the protection reaction. The catalyst was washed with dichloromethane, dried at room temperature and finally was heated to 130°C for 3h. Catalytic amounts of cheap and simple Keggin type H5PM10V2 led to protection of alcohols with acetic acid in high yields, with reduced reaction times under solvent free conditions.
SYNTHESIS OF DICHLOROKETENE ACETALS UNDER CONDITIONS OF PHASE-TRANSFER CATALYSIS AND THEIR REACTIONS WITH SULFUR-CONTAINING ELECTROPHILES
Guseva, S. A.,Mirskova, A. N.,Levkovskaya, G. G.,Kalikhman, I. D.,Voronkov, M. G.
, p. 261 - 268 (2007/10/02)
A method was developed for the production of dichloroketene acetals by the dehydrochlorination of chloral acetals in DMFA in the presence of triethylbenzylammonium chloride as phase-transfer catalyst.Sulfur monochloride, sulfur dichloride, and benzene sulfenyl chloride react with dichloroketene acetals with the formation of adducts (alkoxycarbonyldichloromethanesulfenyl chloride ClSCCl2COOR, alkoxycarbonyldichloromethanethiosulfenyl chloride ClSSCCl2COOR, and butyl phenylthiodichloroacetate C6H5SCCl2COOR respectively).The action of secondary amines on butoxycarbonyldichloromethanesulfenyl chloride gave sulfenamides R1R2NSCCl2COOBu.The reactions of butoxycarbonyldichloromethanethiosulfenyl chloride and butyl phenylthiodichloroacetate with secondary amines under various conditions led to degradation products.
