Vinyl compounds ethers

Vinyl compounds 23, 40. 6H Vinyl compounds, esters 70, 136 Vinyl compounds, ethers 70 Vinylenes 23, 68, 257 Vinylidene compounds 23, 68... 

Heat-SensitiZingProcess. Another process used to make latex mbber articles of thicker section involves sensitizing the compound so that it coagulates when heated to a given temperature, then using heated molds to build the article to the desired thickness. Ammonia-preserved latex is used in this process, and polyether, polythioether, or poly(vinyl methyl ether) (PVME) can be used as heat-sensitizing agents. 

Organosodium compounds are prepared from sodium and other organometaUic compounds or active methylene compounds by reaction with organic haUdes, cleavage of ethers, or addition to unsaturated compounds. Some aromatic vinyl compounds and aHyUc compounds also give sodium derivatives. 

Both stereoselectivity and regioselectivity occur in the reaction of steroid vinyl esters, ethers, and related compounds with A -fluoropyridinium salts [75, 7d] (equation 45). 

In general, hydrogenolysis of vinylic compounds is favored by platinum and hydrogenation by ruthenium and rhodium 31,55,59,72,106). In the reduction of 4-methyl-1-cyclohexenyl ether, the order of decreasing hydrogenolysis to give methylcyclohexane was established as Pt Ir > Rh > Os Ru = Pd (52). 

Ethylidenetriphenylphosphorane and iV-methyl-iV-phenylthioacetamide (89) in THF gave a suspension from which the vinyl thio-ethers (91) were obtained on treatment with carbonyl compounds. The suspension... 

Scheme 44 Anodic addition of the anion of a 1,3-dicarbonyl compound to vinyl ethyl ether.

In comparison to other vinylic compounds , the vinyl proton in 1-alkenyl carbamates, deprotonation has a very high kinetic acidity . After protection of the 4-hydroxy group in the homoaldol products by silylation, deprotonation (w-BuLi, TMEDA, diethyl ether or THF) of enol carbamate 384 is complete at —78 °C (equation 103), and the resulting vinyUithium 385 can be kept at this temperature without decomposition for several hours. Stannylation , silylation , methoxycarbonylation (with methyl chloroformate) ... 

Compound Name Vinyl Methyl Ether, Inhibited Methyl Vinyl Ketone Dimethylzinc Maleic Hydrazide Methyl Amyl Alcohol Methyl Isobutyl Carbinol Methyl Isobutyl Ketone Methyl Amyl Alcohol Methyl Isobutyl Carbinol Carboli Oil... 

Cyclic ethers, cyclic acetals, and some vinyl compounds can be polymerized by cationic processes. Photoinitiation of these polymerizations by ultraviolet light are known (12,106). Some extension of direct photolytic sensitization of cationic processes to visible wavelengths is obtained by the use of colored diazonium salts as initiators. For example, Schlesinger (11a) used diazonium salts substituted in the para position with electron withdrawing groups, but sensitivity was limited to the blue to green regions of the spectrum. 

A stable, readily soluable platinum ir-vinyl alcohol complex has now been synthesized and well characterized. Initially, this compound, chloro(acetylacetonato)(ir-ethenol)platinum(II) (45), was synthesized from the ir-ethylene compound (43) via a vinyl trimethylsilyl ether complex (44) using the same general procedure employed in the synthesis of (41) and (42) (44). 

The C02 yield considerably exceeds that of the acetylacetone-like product, and although C02 is certainly also formed in other reactions (cf. the low molecular weight model Ulanski et al. 1996b), this observation maybe taken as a hint that the H-abstraction reaction does not proceed with neighboring groups only (via a favorable six-membered transition state) but also with more distant sites. A chain-type autoxidation has also been observed with poly(vinyl methyl ether) and a related model compound (Janik et al. 2000a,b). 

The amplest compounds to undergo the Claisen rearrangement are the vinyl allyl ethers.10 Vinyl allyl ether itself rearranges cleanly at 255° in the gas phase (XIX —> XX). 

Allylic C-H insertions have been used in key steps of the enantioselective synthesis of the pharmaceuticals (+)-ceitedil (26) [21] and (+)-indatraline (27) [22] (Scheme 11). The allylic C-H insertion reaction is an exciting alternative to the Claisen rearrangement as a rapid method for the synthesis of y,c>-unsaturated ester [23 ]. Similarly, the allylic C-H insertion with vinyl silyl ethers generates protected 1,5-dicarbonyl compounds, a complimentary reaction to the Michael addition [24]. Both types of C-H insertion can be achieved with high diastereoselectiv-ity and enantioselectivity [23, 24]. 

Shostakovskil has published research on the synthesis and utilization of vinyl alkyl ethers. Hydrolysis of these ethers to acetaldehyde is probably commercially used today in the U.S.S.R. (290). Other practical utilizations of this class of compounds have been indicated (106,107,108,-176,185,207,283,368). Shostakovskil found that a variety of acid... 

Like magnesium, lithium reacts with alkyl halides, vinyl halides, and aryl halides to form organometallic compounds. Ether is not necessary for this reaction. Organolithium reagents are made and used in a wide variety of solvents, including alkanes. 

Poly(vinyl alcohol) is utilized as a component of starch-based adhesives.11121114 Other patents report the use of partially oxidized starch,1115 dextrins,1116 dextrins and urea,1117 borax,1118 boric acid,1119 and vinyl methyl ether-maleic acid copolymers.1120 Other patents indicate the use of poly (vinyl alcohol) with partially hydrolyzed poly(vinyl acetate),1121 nonhy-drolyzed poly(vinyl acetate),1122 and poly(vinyl chloride).1123 A few patents have reported such poly acrylic additives as poly (acrylic acid)1124 and its salts,1125 poly(acrylamide),1126 1127 A-methylacrylamide or poly(A-acryl-amide),1128 and polyethyleneimine.1129 Polystyrene has also been used,1130 as well as more complex copolymers such as a maleic acid monobutyl ester-methyl vinyl ether copolymer, together with dextrin and polyacrylamide),1131 carboxylated ethyl acrylate-styrene zinc salt copolymer,1132 ethylene-methyl acrylate-vinyl acetate copolymer,1133 vinyl acetate-vinyl pyr-rolidone copolymer,1134 and ethylene-vinyl acetate copolymer.1135 Some adhesives are compounded with SBR latex1136 1138 and phenol-formaldehyde resins.1139... 

The electrophilic silicon can even bind nucleophilic compounds (ethers, amines, etc.) yielding complexes which initiate polymerizations of vinyl compounds [98]... 

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