2.5- Bis hydroquinone

Figure 12.9 Regioselectivity of the hydrolysis of hydroquinone bis-esters (Rubio, 1991).

Two series of polyether polyurethanes (PU) based on hydroquinone bis (P-hydroxyethyl) ether (HQEE) or 1,4-butanediol (BDO) as a chain extender were prepared by the one step bulk polymerisation process. By varying the mole ratio of poly tetra methylene oxide (PTMO) extender (with Mn = 1000 and Mn = 2000) and 4,4 -diphenylene methane diisocyanate (MDI) the two series of HQEE (PUlOOOHj, PU 1000H2, PU2000Hj,... 

C10H14O 4-tert-butyl phenol 98-54-4 98.80 1.0726 2 20162 C10H14O4 hydroquinone bis(2-hydroxyethyl) ether 104-38-1 23.57 1.0891 2... 

Interested in the production of phenolic polystyrenes. Stern, English, and Cassidy prepared the monomer 2-vinylhydroquinone (8) as follows. Hydroquinone bis-methoxymethyl ether (5) was converted by reaction of the lithium derivative with... 

These data show that urethane elastomers based on MDI type prepolymer cured with 1,4-butanediol exhibit equivalent or even better physical properties, such as tensile strength, compression set, resilience, tear strength and elongation when compared to elastomers extended with methylene bis (2-chloroaniline), trimethylene glycol di-p-aminobenzoate or hydroquinone bis(2-hydroxyethyl) ether in MDI or TDI system (at equal hardness). Other advantages for 1,4-butanediol curative are low toxicity, liquid state at room temperature, ease of handling and lower cost than other well-known curatives. 

EINECS 203-197-3 Hydroquinone bis(p-hydroxyethyl) ether Hydroquinone bis(2-hydroxyethyl) ether Hydroquinone diethylol ether NSC 1862 Vernatzer 30/10. 

Brucine is oxidized by 5 V nitric acid (or chromic acid (159)) at 0-5° to a rose-colored solution from which a red bruciquinone (bis-desmethylbrucine, (C21H20O4N2), XCIII) can be isolated as its perchlorate. It is a typical quinone because it is reduced by sulfurous acid to a hydroquinone, bis-apomethylbrucine (diacetate formation brucine yields two moles of methyl chloride when heated with hydrochloric acid but bis-apomethylbrucine could not be isolated from the reaction mixture (191) ). No other alterations occur in the brucine molecule during these transformations since methylation (dimethyl sulfate) converts bis-apomethylbrucine to the quaternary salt of brucine. The hydroquinone has been oxidized, with... 

Bis (2-hydroxyethoxy) benzene 1,4-Bis (P-hydroxyethoxy) benzene. See Hydroquinone bis (2-hydroxyethyi) ether... 

Bis (P-hydroxyethyl) hydroquinone ether. See Hydroquinone bis (2-hydroxyethyl) ether Bis-(2-hydroxyethyl) isodecyloxypropylamine CAS 34360-00-4... 

Ethanol, 2,2 -oxydi-. See Diethylene glycol Ethanol, 2-(2-phenoxyethoxy). See Diethylene glycol phenyl ether Ethanol, 2-phenoxy-, propanoate. See Phenoxyethyl propionate Ethanol, 1-phenyl-. See a-Methylbenzyl alcohol Ethanol, 2-phenyl-. See Phenethyl alcohol Ethanol, 2,2 -(1,4-phenylenebis (oxy)) bis-. See Hydroquinone bis (2-hydroxyethyl) ether Ethanol, 2,2 -(phenylimino)bis-, diacetate (ester). See N,N-Bisacetoxyethyl aniline... 

Phenylene bis (1-methylethylidine)) bis(1,1-dimethylethyl) peroxide. See Di-(2-t-butylperoxyisopropyl) benzene 2,2 -(1,4-Phenylenebis (oxy)) bisethanol. See Hydroquinone bis (2-hydroxyethyl) ether 2,2 -(1,3-Phenylenebis (oxymethylene)) bisoxirane. See Resorcinol diglycidyl ether 4,4 -o-Phenylenebis (3-thioallophanic acid) dimethyl ester. See Thiophanate-methyl Phenylene brown. See Basic brown 1... 

Hexamethylene glycol Neopentyl glycol Polypropylene glycol Tripropylene glycol chain extender, PU elastomers Hydroquinone bis (2-hydroxyethyl) ether 4,4 -Methylenebis (3-chloro-2,6-diethylaniline) 4,4 -Methylenebis 2,6-diethylaniline 4,4 -Methylenebis 2,6-diisopropylaniline 4,4 -Methylenebis 2-isopropyl-6-methylaniline Resorcinol di (P-hydroxyethyl) ether Resorcinol di (P-hydroxypropyl) ether chain growth, ethylene longer chain aluminum alkyls... 

Heptadecanol Heptanal Heptane Heptanoic acid Hexabromocyclododecane Hexachlorobenzene Hexachloroethane Hexadecene-1 Hippuric acid Hydroquinone bis (2-hydroxyethyl) ether Hydroxyethyl-s-triazine Hydroxylamine Isoamyl alcohol Isobutyl alcohol Isobutylaluminum sesquichloride Isobutylamine Isobutylcyclohexane Isobutylcyclopentane Isoheptane Isooctane Isoprenylaluminum Isopropyl acetate... 

Hydroquinone bis (2-hydroxyethyi) ether 104-40-5 p-Nonyi phenoi 104-45-0 p-Propyi anisoie 104-46-1 Anethoie 104-50-7 y-Octaiactone 104-51-8 n-Butyibenzene 104-53-0... 

Recently (year 2010), our studies have been continued by Pichon et al. [347], who also investigated the evolution during maturation and the consequences on the PUs elastic properties. The material used in their work was based on the diisocyanate MDI, and on the polyester PCL. Hydroquinone bis(j0-hydroxyethyl)ether (HQEE), was preferred to the chain extender EDO, because of its higher incompatibility with the polyester SS [9,347]. The polymers were cast with a small excess of isocyanate (6%) and kept in time under atmospheric humidity at ambient temperature. DMA... 

Aromatic glycidyl esters with various substituents in the nucleus -chlorine, nitro group, allq l radicals, as well as hydroquinone bis-glycidyl and resorcinol bis-glycidyl esters - have been investigated as stabilizers of the copolymer of vinyl chloride with vinylidene chloride. 

Zha L, Wu M, Yang J. Hydrogen bonding and morphological structure of segmented polyurethanes based on hydroquinone-bis (p-hydroxyethy) ether as a chain extender. J Appl Polym Sci 1999 73(14) 2895-902. 

A series of segmented polyurethanes with urethane chains composed of PPG400 glycols and MDI as soft segments were synthesized. The PPG400 polyols were dried at 80°C under vacuum for six hours prior to use. MDI, hydroquinone bis(2-hydroxyethyl)ether (HQEE) and MOCA were used as received. DMF and BD were dried with 4 A molecular sieves in advance. The segmented polyurethanes were synthesized in a modified prepolymer copolymerization (Fig. 4.22). 

Hydroquinone bis-(befa-hydroxyethyl) ether Hydroquinone di-(2-hydroxyethyl) ether... 

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