Butyl INDEX

Ethers are unaffected by sodium and by acetyl (or benzoyl) chloride. Both the purely aliphatic ethers e.g., di-n-butyl ether (C4H, )30 and the mixed aliphatic - aromatic ethers (e.g., anisole C3HSOCH3) are encountered in Solubility Group V the purely aromatic ethers e.g., diphenyl ether (C,Hj)20 are generally insoluble in concentrated sulphuric acid and are found in Solubility Group VI. The purely aliphatic ethers are very inert and their final identification may, of necessity, depend upon their physical properties (b.p., density and/or refractive index). Ethers do, however, suffer fission when heated with excess of 67 per cent, hydriodic acid, but the reaction is generally only of value for the characterisation of symmetrical ethers (R = R ) ... 

The next step in this study is to test this control algorithm on the actual laboratory reactor. The major difficulty is the direct measurement of the state variables in the reactor (T, M, I, W). Proposed strategy is to measure total mols of polymer (T) with visible light absorption and monomer concentration (M) with IR absorption. Initiator concentration (I) can be monitored by titrating the n-butyl lithium with water and detecting the resultant butane gas in a thermal conductivity cell. Finally W can be obtained by refractive index measurements in conjuction with the other three measurements. Preliminary experiments indicate that this strategy will result in fast and accurate measurements of the state vector x. 

Linear absorption and fluorescence spectra for the series of symmetrical cationic polymethines with 5-butyl-7,8-dihydrobenzo[ /]furo 2,3 /lindolium terminal groups are shown in Fig. 14 for solvents of different polarity. It is known that the polarity of solvents can be characterized by their orientational polarizability, which is given by Af = (e- l)/(2e + 1) — (n2 - l )/(2n2 +1), where e is the static dielectric constant and n is the refractive index of the solvent [41], Calculated A/values... 

We wished to evaluate the reactivity of triisopropylphenylphosphole (17b), exhibiting a somewhat smaller Bird-index, than the tri-tm-butyl derivative (17d) (40.4 vs. 54.9). It was found that the acylation of the hetero ring took place only to a small extent. Acylation of the trialkylphenyl ring was a concurrent reaction path, but the major product was 2-acyl-5-aryl-bromophosphole (29) shown in Scheme 7 [47],... 

The beneficial effect of the change of the flow rate of the mobile phase has also been exploited for the improvement of CCC purification of the components of the dye Quinoline yellow (Colour Index No. 47005). The chemical structures of the components of Quinoline yellow are shown in Fig. 3.121. The two-phase system used for the purification consisted of tm-butyl methyl ether-l-butanol-ACN-0.1 M TFA (1 3 1 5 v/v). The column... 

Many alkyl nitrites are thermally unstable and may readily decompose or explode on heating [1], Methyl nitrite explodes more violently than ethyl nitrite [2], Lower alkyl nitrites have been known to decompose and burst the container, even in refrigerated storage [3], Individually indexed compounds are f Butyl nitrite, 1658 f fert-Butyl nitrite, 1659... 

The violence of the explosion when the ethyl ester was heated at 80°C was not so great as reported previously. The propyl and butyl esters explode if heated rapidly, but decompose smoothly if heated gradually [1], Dialkyl hyponitrites with alkyl groups below C(, are shock-sensitive [2], The shock-sensitivity decreases with increasing MW, and it was not possible to detonate esters above C6. The aryl esters were insensitive and the alkyl esters became so on dilution with solvent [3], Individually indexed compounds are ... 

These selectivity differences provide a rational basis for a three-column initial screening strategy a strongly hydrophobic column, a weakly hydrophobic column, and a phenyl column. Commercially available columns are not indexed in a manner that easily allows column selection based on hydrophobicity however, butyl columns are good candidates for strongly hydrophobic columns. Columns with names like ether-, iso-, and isopropyl are good candidates for weakly hydrophobic columns. 

Aminabhavi, T.M. and Banerjee, K. Density, viscosity, refractive index, and speed of sound in binary mixtures of acrylonitrile with methyl acetate, ethyl acetate, n-propyl acetate, n-butyl acetate, and 3-methylbutyl-2-acetate in the temperature interval (298.15-308.15) K, / Chem. Eng. Data, 43(4) 514-518, 1998b. 

Butyl acrylate/0.3 moles/kg crosslinker copolymers In toluene. See Experimental for a definition of swell Index. 

Individually indexed commercial peroxides are Acetyl cyclohexanesulfonyl peroxide, 3033 Bis(3-carboxypropionyl) peroxide, 2990 Bis(2,4-dichlorobenzoyl) peroxide, 3623 Bis(2-hydroperoxy-2-butyl) peroxide, 3078 Bis(l-hydroperoxycyclohexyl) peroxide, 3553 2-(9-/erf-Butyl hydrogen monoperoxymaleate, 3015... 

Modification of the catechol ring can dramatically increase Pj activity, such as bronchodilation. The Pj/Pi index increases when a 3-OH group is substituted for a sulfonamide (soterenol, 4.56), hydroxymethyl (albuterol, 4.57), or methylamino group. Inclusion of the nitrogen into a carbostyryl ring (an a-dihydroquinolone) leads to a compound (4.58) that is 23,000 times more active than isoproterenol and also extremely selective. This compound carries a somewhat different N-substituent, a tert-butyl group, like albuterol. 

Fig. 16.2 Flavour dilution (FD) chromatogram obtained by application of aroma extract dilution analysis on an extract prepared from parsley leaves. The odorants were identified as 1 methyl 2-methylbutanoate, 2 myrcene, 3 l-octen-3-one, 4 (2)-l,5-octadien-3-one, 5 2-isopropyl-3-me-thoxypyrazine, 6p-mentha-l,3,8-triene, 71inalool, 8 2-sec-butyl-3-methoxypyrazine, 9 (.Z)-6-dece-nal, 10 / -citronellol, 11 ( , )-2,4-decadienal, 12 / -ionone, 13 myristicin, 14 unknown. RI retention index. [30, 31]...

The copolymer of isobutylene with a few percent isoprenc (butyl rubber) can be cured to produce an ozone-resistant elastomer with low permeability to oxygen and nitrogen. Butyl rubber has a Tt of — 70 C a refractive index of 1.5081, and a coefficient of linear expansion of 5.7 X 10 cm/cxn C. Chloro and bromo butyl rubber are more resistant to the permeation of oxygen and nitrogen than butyl rubber. 

Abbreviations ODA = ortho dispersant index, BAPP = butyl acetate poly propylene, PDMA = poly dimethyl acrylate, and PDA = phenylene diamine. 

A pressure glass vessel was charged with a cyclohexane solution of butadiene (60 g) and styrene (15 g) and treated with 11.7 ml of the step 1 product and the mixture polymerized at 50°C for 2.5 hours. The conversion was approximately 100%. Thereafter, 0.5 ml of 5% 2,6-di-f-butyl-p-cresol dissolved in isopropanol was added and the mixture precipitated in an isopropanol solution containing slight amounts of hydrochloric acid and BHT. The mixture was dried and the product isolated having an Mn of 1.74 x 105Da with a polydispersity index (PDI) of 1.02 and MLi+4 (100°C) of 22. 

High refractive index optical lenses were prepared by Your et al. (1) consisting of trifluoroethyl methacrylate, butyl acrylate, phenyl ethyl acrylate, and ethylene glycol dimethacrylate. 

It appears from the evolution of the adhesion index that a distinction has to be made between the interactions carbon blacks are able to have with unsaturated or with saturated (or near-to-saturated) elastomers. Thus, the adhesion index of butyl rubber is enhanced upon oxidation of the black, while the reverse is observed with polybutadiene 38). The improvement of the reinforcing ability of carbon black upon oxidation, in the former case, has been interpreted by Gessler 401 as due to chemical interactions of butyl rubber with active functional groups on the solid surface. Gessler, relating the reinforcing characteristics of the oxidized carbon black for butyl rubber to the presence of carboxyl groups on the surface of the filler, postulated a cationic... 

In concentrated sulfuric acid, aromatic polyisocyanides are subject to sulfona-tion. Poly(isopropyl isocyanide) is dissolved in 97%H2S04, and is reprecipitated by the addition of water. Infrared spectra show that some structural change, e.g. hydrolysis, has taken place (26). Poly(sec-butyl isocyanide) is dissolved by the acidic hexafluoroisopropanol with some attendant browning of the solution (7). In spite of the theoretical complexities of polyelectrolytic character introduced into the solution characterization of polyisocyanides in strongly acidic media, such media at least allow viscometric indexing of the various samples of the otherwise insoluble polyisocyanides. 

Index - [AMNES - AMINES,AROMATIC - PHENYLENEDIAMINES] (Vol 2) -for butyl rubber [ELASTOhffiRS, SYNTHETIC - BUTYL RUBBER] (Vol 8) - 1,2-dihydroqumolmes as [QUINOLINES AND ISOQUINOLINES] (Vol 20) -for isoprene rubber [ELASTOhffiRS SYNTHETIC - POLYISOPRENE] (Vol 9)... 

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