Cyclohexane 1,2-divinyl

On each of the curves, the points at lowest X represent swelling in cyclohexane, the next in tetrahydrofuran and the last in benzene. In all cases, the samples were swollen in the pure solvent. The curves are reproduced from Figure 13 of Reference 19. The networks were made from anionically polymerized polyr-styrene using a bifunctional initiator crosslinked subsequently by divinyl benzene. The curves correspond to different ratios of divinyl benzene (DVB) per polystyrene living end (LE),... 

The dioxime of cyclohexane-1,4-dione reacts with acetylene in an autoclave in the presence of KOH/dimethyl sulfoxide (DMSO) (Trofimov reaction) to give l,5-divinyl-4,8-dihydropyrrolo[2,32f]indole by sequential [1,3]- and [3,3]-rearrangements in poor yield (Equation 91) <2004TL3789>. 

Cyclohexane dimethanol divinyl ether (donor)-alkyl maleimide (acceptor)... 

Although a plethora of divinyl aromatic compounds have been investigated as precursors for hydrocarbon-soluble dihthium initiators (68), the only system which has been demonstrated to produce a hydrocarbon-soluble dihthium initiator is based on l,3-bis(l-phenylethenyl)benzene (60,81—85). The addition reaction of sec-hutylhthium with l,3-bis(l-phenylethenyl)benzene [34241-86-6] (eq. 16) proceeds rapidly and efficiently to produce the corresponding dilithinm species in toluene (86) or in cyclohexane (82). This dihthium initiator is not only soluble in hydrocarbon media such as cyclohexane, benzene, and toluene (even at —20° C) (84), but also functions as an efficient difunctional initiator for the preparation of homopolymers and triblock copolymers with relatively narrow molecular weight distributions (81—83). However, it is necessary to add a small amount of Lewis base or two equivalents of lithium jw-butoxide to produce narrow, monomodal molecular weight distributions. Lithium JW-butoxide is the preferred additive, since high 1,4-polybutadienes are obtained (60). 

Dioximes of hexane-2,5-dione (81) and cyclohexane-1,4-dione (82) reacted with acetylene under pressure to give dipyrrole 83 and 1,5-divinyl-4,8-dihydropyrrolo[2,3-/]indole (84) in 12% and 6% yields, respectively, thus exemplifying a very simple, straightforward route to inaccessible or unknown pyrrolic assemblies (Equation (22)) (04TL3789). 

Scheme 5 Cope equilibria in 1,2-divinyl-cyclopentanes and -cyclohexanes...

Cho and Hong (2005) used photodifferential scanning calorimetry to investigate the photocuring kinetics of UV-initiated cationic photopolymerization of 1,4-cyclohexane dimethanol divinyl ether (CHVE) monomer with and without a photosensitizer, 2,4-diethylthioxanthone (DETX) in the presence of a diaryliodonium-salt photoinitiator. Two kinetic parameters, the rate constant (k) and the order of the initiation reaction (m), were determined for the CHVE system using an auto-catalytic kinetics model as shown in the following equation ... 

Styrene, divinyl-benzene (DVB), dioxane, methanol and cyclohexane were purified according to published methods [ 12] Styrene-divinylbenzene copolymer (X AD-8) was procured from Fluka... 

Triethylene glycol divinyl ether (donor) — maleimide (acceptor) 1,4-Cyclohexane dimethanol divinyl ether (donor) — alkyl maleimide... 

Difunctional Initiators The methodology for preparation of hydrocarbon-soluble dilithium initiators is generally based on the reaction of an aromatic divinyl precursor with two mol of butyllithium. Unfortunately, because of the tendency of organolithium chain ends in hydrocarbon solution to associate and form electron-deficient dimeric, tetrameric, or hexameric aggregates, most attempts to prepare dilithium initiators in hydrocarbon media have generally resulted in the formation of insoluble three-dimensionally associated species [70]. The reaction of meffl-diisoprenylbenzene with 2 mol of f-butyllithium in the presence of 1 equivalent of triethylamine in cyclohexane at -20 °C has been reported to form pure diadduct without oligomerization. Equation 7.11 [71]. This initiator in the presence of 5 vol% of diethyl ether for the butadiene block has been used to prepare well-defined poly(metliyl methacrylate)- -polybutadiene-fe -poly(methyl methacrylate). 

Chem. Descrip. 1,4-Cyclohexane dimethanol, divinyl ether CAS 17351-75-6... 

Bis (2-vinyloxyethyl) ether. See Diethylene glycol divinyl ether 1,4-Bis((vinyloxy)methyl)cyclohexane. See 1,4-Cyclohexanedimethanol divinyl ether... 

Pyrolysis of c/5, rra/i5 -l,5-cyclodecadiene gives greater than 99% cw-l,2-divinyl-cyclohexane at 120°C with a half-life of 7 The reaction stereochemistry is consistent with a chair-like transition state (See Chapter 7, Section 4.1) (Scheme 11.101). 

By contrast, pyrolysis of tranSytrans-, 5-cyc odtcdid txvt gave ra -l,2-divinyl-cyclohexane upon heating to 40°C with a half-life of 144 min. This reaction too requires a chair-like transition state (Scheme 11.102). 

Bis((vinyloxy)methyl)cyclohexane. See 1,4-Cyclohexanedimethanol divinyl ether Bis [4-(vinyloxy) methyl] cyclohexyl] methyl] terephthalate. See Bis [[[4-(ethenyloxy) methyl] cyclohexyl] methyl] terephthalate Bis (4-vinylthiophenyl) sulfide CAS 152419-78-8 Synonyms MPV... 

Cyclopolymerizations also occur with methacrylic anhydride, divinyl formal, o-divinyl benzene, o-diallyl phthalate, and even 1,4-dimethylene cyclohexane ... 

Polybutylcyanoacrylates [63], polyacrylics [64], polybutadiene [65], flame retardant PE [66], PS [67-70], PS - divinyl benzene copolymer [71], PS - acrylonitrile copolymer [72], acrylonitrile-butadiene-styrene terpolymer [73, 74], styrene-maleic anhydride copolymer [75], polyvinyl-cyclohexane [76], polyphenylene triazine [77], poly-4-vinyl pyridine [78], polyethylene sulfide [79], PSF [80], brominated PES [81], tetrafluoroborate doped polythiophene [82], polysiloxane [56, 83], vinyl pyrrolidone-methacryloxy silicone copolymer [50], polyvinyl indene [84], poly-E-lactide [3, 85, 86], epoxy resins [87, 88], polyaryl ether ketone [89, 90], ethylene... 

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