Methallyl sulfonate

More recently, a number of reports dealing with 1,3-sulfonyl shifts which proceed by other mechanisms have been published. For example, Baechler and coworkers suggested that the higher activation enthalpy observed for the isomerization of the deuterium labeled methallyl sulfone 72 in nitrobenzene at 150°C as compared to the corresponding sulfide, together with the positive entropy of activation may be taken as evidence for a homolytic dissociation mechanism (equation 44). A similar mechanism has also been suggested by Little and coworkers for the gas-phase thermal rearrangement of deuterium labelled allyl sec-butyl sulfone, which precedes its pyrolysis to alkene and sulfur dioxide. 

Microdialysis probes are now commercially available in various sizes, designs and materials. Microdialysis probes can be flexible for soft peripheral tissues and fluids or rigid for brain. Four probe geometries are available linear, loop, side-by-side and concentric. The semipermeable membrane is generally chosen as long as possible, typically between 1 and 10 mm. The probe radius is generally chosen as small as possible, typically between 200 and 400 im O.D. to cause minimal disturbances within the tissue. Dialysis probes are made of various materials (for example celluloses and copolymers like polyacetonitrile/sodium methallyl sulfonate and polycarbonate/ether). The molecular mass cut off (5-50 kDa), inertness and permeability to solutes of the probes could be different. 

Intermolecular cyclizations. One-pot alkylation-cyclization of 7-tosyl-substituted benzyl-methallylamines afforded eight-membered derivatives via 7-amino-methallyl sulfone anions <1996JOC5004>. The dilithiation of benzyl [2-(tosylmethyl)propenyl]amine 124 with BuLi at — 78 °C led to a mono- and di-anion the dianion further reacted with a, -dihalo derivatives to produce azocanes (Schemes 52 and 53 <1996JOC5004>). Thus, reacting the methallyl sulfone anion of 124 with 1,4-diiodobutane, 126 was obtained in 21% yield, while the main product 127 obtained in 42% yield was the result of monoalkylation. Similarly, 2,3-bis(bromomethyl)buta-l,3-diene 124 reacted with the same dianion to afford only azocane 129 in 42% yield (Scheme 53). 

Polyacrylonitrile (PAN) PAN-Polyvlnylchlorlde Copolymer PAN-Methallyl Sulfonate Copolymer Polyamide (aromatic)... 

Few studies have been conducted heretofore on sulfonated ionomers in solvents which can be considered relatively polar, as defined by a high dielectric constant. A recent study (13) on acrylonitrile-methallyl sulfonate copolymers in dimethyl-formamide is a notable exception. S-PS is readily soluble in a wide variety of solvents, some of them exhibiting rather high values of dielectric constant, such as dimethylformamide (DMF) or dimethylsulfoxide (DMSO). The reduced viscosity-concentration behavior of sulfonated polystyrene is markedly different in polar solvents from that in nonpolar-solvent systems. Typically there is a marked upsweep in reduced viscosity at low polymer concentrations and clearly a manifestation of classic polyelectrolyte behavior. ( 7)... 

AI3-16415 EINECS 216-341-5 Geropon MLS/A Methallyl sulfonate Methallylsulfonic acid, sodium salt 2-Methyl-2-propene-1-sulfbnic acid, sodium salt NSC 2253 2-Propene-1-sulfonic acid, 2-methyl-, sodium salt Sodium 2-methyl-2-propenesulfonate Sodium 2-methylprop-2-ene-1-sulphonate. Dye improver reactive comonomer for acrylic fibers polymerization reacbve emulsifier or coemulsifier in latex emulsion polymerization. Rhdne-Poulenc. 

Desulfonylation. The facile detachment of the arenesulfonyl moiety from allylic benzothiazol-2-yl sulfones with the use of NaBHjCN is crucial to the preparation of alkenes by chain homologation based on alkylation of benzothiazol-2-yl methallyl sulfone.-Transposition of the double bond occurs during the desulfonylation. 

Obtaining synthetic PAN Cber of a nitrone type is preceded by the preparation of a spinning solution by means of copolymerization of AN with MA (or VA) and itaconic acid (lA), or acrylic acid (AA), or methacrylic acid (MAA), or methallyl sulfonate (MAS). Usually, mixtures contain 15% of AN, 5-6% of the second monomer, 1-2% of... 

Methylpropenenitrile 2-Methyl-2-propenenitrile. See Methacrylonitrile 2-Methyl-2-propene-1-ol. SeeMethallyl alcohol 2-Methylpropene polymer. See Polyisobutene 2-Methyl-1-propene, polymer with 2,5-furandione. See Isobutylene/MA copolymer 2-Methyl-2-propene-1-sulfonic acid sodium salt. See Sodium methallyl sulfonate Methyl propenoate Methyl 2-propenoate. See Methyl acrylate... 

PEG-20 corn glycerides PEG-4 dioieate Propylene glycol laurate Propylene glycol oleate Propylene glycol oleate SE Propylene glycol ricinoleate Propylene glycol stearate SE coemuisifier, plastics PEG-10 cocamine PEG-4 dioieate coemuisifier, polymerization Sodium 2-ethylhexyl sulfate coemuisifier, pulp/paper Propylene glycol laurate coemuisifier, rayon delustrants PEG-15 castor oil coemuisifier, reactive Sodium methallyl sulfonate... 

PEG laurate emulsifier, reactive Sodium methallyl sulfonate emulsifier, refined oils Sulfated tall oil... 

Sodium methallyl sulfonate C4H7Na04 XH2O Sodium diacetate C4H8 1 Butene Isobutylene (C4H8)x Polybutene Polyisobutene C4H8Br2... 

Sodium methallyl sulfonate (SMS) Sodium 2-acrylamido-2-methyl propane sulfonate (SAMPS)... 

Michael Addition. Methallyl phenyl sulfone has been a good partner with a variety of different Michael receptors. Addition to enones using / BuLi as base at —78 °C gave the desired products in good yields. Methyl vinyl ketone afforded the Michael adduct in 61% yield (eq 7). Reaction of methallyl sulfone with 2-hexenone and 2-methyl-2-pentenone in the presence of HMPA provided the conjugate addition products in 91% yield and 79% yield, respectively (eqs 8 and 9).lO.Ha... 

Michael addition to substituted enoates has proven diastereo-selective. Ethyl ( )-crotonate or ethyl ( )-cinnamate afforded conjugate addition adducts in 92% yield and 87% yield with anfi/sj73-diastereomeric ratios of 85/15 and 100/0, respectively (eq 10) whereas in the presence of HMPA the diastereoselectiv-ity was reversed. With the y-oxygenatedenoate, anfr-diastereo-selectivity resulted HMPA improved the selectivity from 8/1 to 12/1 (eq 11). Similar results were obtained with a conjugated lactone (eq 12). Ethyl ynoate also acted as a reactive Michael receptor for the methallyl sulfone (eq 13). Other conjugated substrates such as nitroolefins and acrylonitrile proved to be appropriate Michael receptors as well. 

Bromo methallyl sulfone, prepared from methallyl phenyl sulfone, has proven to be a good substrate for stereoselective synthesis of trisubstituted methylenecyclopentanes with a variety of different Michael receptors. For example, the trans trans-trisubstituted methylenecyclopentane was efficiently prepared in 93% yield by a cascade Michael addition/cyclization beginning with ethyl ( )-crotonate (eq 22). The phosphonate sulfone reagent, readily available from methallyl phenyl sulfone, was used for the selective synthesis of 1,3-dienes. The synthesis included... 

Chloro-2-methyl-l-propene,methallyl chloride, CH2=C(CH3)-CH2C1, is produced by the chlorination of isobutylene in the gas phase at temperatures below 100 C. Of greatest commercial interest are its reactions with sodium sulfite to give sodium methallyl sulfonate, and the production of 2-methyl epichlorohydrin. 

Detergent builders Vinyl sulfonic acid, methallyl-sulfonic acid Japan 149,705 1975 Lion Fat and Oil... 

Methallyl alkyl ethers, MA copolymerization, 621 Methallylamine, MA copolymerization, 312 Methallyl o-benzoylbenzoate, MA copolymerization, 660 Methallyl perfluoroisopropyl ether, MA copolymerization, 660 2-Methallylphenol, MA copolymer, 447 Methallyl sulfonic acid, MA copolymerization,... 

Methallylsulfonic acid sodium saH. See Sodium methallyl sulfonate Methanal. See Formaldehyde Methanamine. See Methylamine... 

Methyl-2-propene-1-sulfonic acid sodium salt. See Sodium methallyl sulfonate... 

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