Dimethyl ether INDEX

General procedure for deprotection of mono- and polymethyl-aryl ethers with boron tribromide.41 To a 10-ml flask fitted with a septum and magnetic stirrer bar are added reactant (3.6 mmol) and 5 ml of dichloromethane. An inert atmosphere is established and maintained. This mixture is cooled in a dry ice/propan-2-ol bath and boron tribromide [0.13 ml, 1.32 mmol (for monomethyl ethers), or 0.38 ml, 4 mmol (for dimethyl ethers)] is added through the septum by use of a syringe. The cold bath is removed and the mixture stirred for 30 minutes, poured into ice water, stirred for 30 minutes, saturated with salt and extracted with dichloromethane. The extract is dried and concentrated. The purity of the product is established by h.p.l.c. analysis on a Waters Associates 6000A model using both refractive index and u.v. absorbance detectors with a Waters 3.9mm i.d. x 30cm p-Bondapack Ci8 reverse phase column. 

For the dimethyl ether subseries, a qualitative good correlation between local electrophilicity and the theoretical 13C NMR chemical shifts described by the IGLO and GIAO-MP2 indexes was obtained. Note further that for the species for which the experimental NMR chemical shift is available (dimethyl ether and the trimethyl oxonium cation), the enhancement in electrophilicity is again correlated with the enhancement in the experimental chemical shift at the carbon atom. 

See also PBT degradation structure and properties of, 44-46 synthesis of, 106, 191 Polycaprolactam (PCA), 530, 541 Poly(e-caprolactone) (CAPA, PCL), 28, 42, 86. See also PCL degradation OH-terminated, 98-99 Polycaprolactones, 213 Poly(carbo[dimethyl]silane)s, 450, 451 Polycarbonate glycols, 207 Polycarbonate-polysulfone block copolymer, 360 Polycarbonates, 213 chemical structure of, 5 Polycarbosilanes, 450-456 Poly(chlorocarbosilanes), 454 Polycondensations, 57, 100 Poly(l,4-cyclohexylenedimethylene terephthalate) (PCT), 25 Polydimethyl siloxanes, 4 Poly(dioxanone) (PDO), 27 Poly (4,4 -dipheny lpheny lpho sphine oxide) (PAPO), 347 Polydispersity, 57 Polydispersity index, 444 Poly(D-lactic acid) (PDLA), 41 Poly(DL-lactic acid) (PDLLA), 42 Polyester amides, 18 Polyester-based networks, 58-60 Polyester carbonates, 18 Polyester-ether block copolymers, 20 Polyester-ethers, 26... 

II (Lower-index inert component) Cyclohexyl methacrylate Ethylene glycol dimethacrylate Dimethyl suberate Benzoin methyl ether 1.0 ml 0.12 ml 0.25 ml 0.06 g Monomer Crosslinking monomer Inert Initiator 1.505 -1.5 1.4326... 

DOT UN 2529 mf C4H8O2 mw 88.12 PROP Colorless liquid pungent odor of rancid butter. Mp —47°, bp 118-119° 35 mm, flash p 132°F (TOC), d 0.949 20°/4°, refr index 1.392, vap press 1 mm 14.7°, vap d 3.04, autoign temp 935°F. Misc with ale, chloroform, ether, fixed oils, glycerin, propylene glycol insol in water. SYNS ACETIC ACID, DIMETHYL- DIMETHYL-ACETIC ACID FEMA No. 2222 ISOBUTYRIC ACID (DOT) ISOPROPYLFORMIC ACID KYSELINA ISOMASEIA A a-METHYLPROPIONIC ACID 2-METHYLPROPIONIC ACID PROPIONIC ACID, 2-xMETHTT.-... 

Alkyl (Cl3-15) dimethylamine. See Dimethyl Cl3-15 alkyl amine Alkyl (C8-10) glycidyl ether CAS 68609-96-1 EINECS/ELINCS 271-845-2 Synonyms Alkyl (C8, CIO) glycidyl ether C8-10 glycidyl ether Octyidecyl glycidyl ether Oxirane, mono ((C8-10-alkyloxy) methyl derive. Classification Nonaromatic ether Definition Glycidyl ether of C8-10 alcohols Properties Dens. 0.900 ref. index 1.4420 Toxicology Irritant sensitizer possible mutagen TSCA listed... 

Properties Colorless clear liq. fumes in air and gradually turns yel. ammonia-like fishy odor sol. in DMSO, 95% ethanol, acetone misc. with dimethyl formamide, hydrocarbons, petrol, ether, ether dec. in water evolves heat on contact with water m.w. 60.10 sp.gr. 0.791 (22/4 C) vapor pressure 157 mm Hg (25 C) m.p. -58 C b.p. 63 C flash pt. 1 C ref. index 1.4075 (20 C) strongly alkaline surf. tens. 28 dynes/cm... 

CAS 55-38-9 EINECS/ELINCS 200-231-9 Synonyms 0,0-Dimethyl-0-4-(methylmercapto)-3-methylphenyl phosphorothioate 0,0-Dimethyl O- [3-methyl-4-(methylthio) phenyl] phosphorothioate 0,0-Dimethyl-0- [4-(methylthio)-m-tolyl]phosphorothioate Mercaptophos 4-Methylmercapto-3-methylphenyl dimethyl thiophosphate Empirical C10H15O3PS2 Formula (CH30)2P(S)0C6H3(CH3)SCH3 Properties Brown liq., si. odor of garlic insol. in water sol. in mostorg. soivs., alcohol, ether, acetone, esp. chlorinated hydrocarbons m.w. 278.34 dens. 1.250 (20/4 C) b.p. 105 C (0.01 mm) ref. index 1.5698 (20 C)... 

Synonyms Abietic acid methyl ester Methyl [1 R-( 1 a,4ap,4ba, 10aa)]-1,2,3,4,41,4b,5,6,10,10a-decahydro-1,4a-dimethyl-7-(1-methylethyl)-1-phenanthrenecarboxylate Methyl ester of wood rosin 1-Phenanthrenecarboxylic acid, 1,2,3,4,4a,4b,5,6,10,10a-decahydro-1,4a-dimethyl-7-(1-methylethyl)-, methyl ester, [1R-(1 a,4ap,4ba, 10aa)]- Podocarpa-7,13-dien-15-oic acid, 13-isopropyl-, methyl ester Wood rosin, methyl ester Definition Commercial prod, is a mixt. of methyl esters of the rosin acids Empirical C21H32O2 Formula C19H29COOCH3 Properties Colorless to yel. thick liq., odorless misc. with alcohol, ether, common org. soivs., aliphatic hydrocarbons insol. in water m.w. 316.47 dens. 1.03 b.p. 360-365 C (dec.) flash pt. (COC) 180 C ref. index 1.53 (20 C)... 

Phenyl-2-methyl-2-propanol. See Dimethyl benzyl carbinol 3-Phenyl-2-methyl-propen-2-ol-1. See Methylcinnamyl alcohol 1 -Phenyl-3-methyl-5-pyrazolone CAS 89-25-8 EINECS/ELINCS 201-891-0 Synonyms Cl developer 1 Developer Z 2.4-Dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one 3-Methyl-1 -phenyl-2-pyrazolin-5-one 3-Methyl-1 -phenyl-5-pyrazolone Norantipyrine Norphenazone 1-Phenyl-3-methyl-5-oxo-2-pyrazoline 1-Phenyl-3-methylpyrazolone-5 5-Pyrazolin-5-one, 3-methyl-1-phenyl-5-Pyrazolone, 3-methyl-1-phenyl-Empirical C10H10N2O Formula C6HsNN C(CH3)CH2CO Properties Wh. to It. yel. powd. orcryst. sol. 10-50 mg/ml in DMSO, 95% ethanol, acetone si. sol. in benzene sol. < 1 mg/ml in water insol. in ether, petrol, ether m.w. 174.20 vapor pressure < 0.01 mm Hg (20 C) m.p. 127-130 C b.p. 287 C (105 mm) ref. index 1.637 (20 C)... 

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