2- ethyl methy

Ethyl methy isi loxane/2-phenylpropylmethylsiloxane copolymer Hexylmethylsiloxane/2-phenylpropylmethylsiloxane copolymer Polymethyloctylsiloxane Polytetradecylmethylsiloxane Silicone glycol copolymer Stearyl dimethicone Stearyl methicone... 

Dimethyl ethyl carbinol (2-methy 1-2-butanol or amyl alcohol), CH3CHjCOH(CH3).2. From ethyl propionate and methyl magnesium iodide. Collect the tertiary alcohol at 100-102°. 

Carboxymethyl)tr(methy(ammonlum chloride hydrazlde (Reagent T ). A cooled soKilion of ethyl chioroacetate (984 g, 6.65 mol) was treated with irimethylamine (200 g, 3.39 mol). After 12-24 h a second portion of trimethylamlne (200 g, 3.39 mol) was added. After complete consumption of ethyl chioroacetate, hydrazine (4C0 g) was added. The product was tillered and dryed under vacuum (H2SO4) to afford 1100 g of T (90%). 

Acetoxy-16/3-m ethyl-16a, 17 a-oxido-pregn-4-ene-3,20-dione, 225 3 -Acetoxy-16-methy lpregna-5,16-dien-20-one, 106... 

A solution of 90 -fluoro-11/3-hydroxy-16/3-methyI-170 ,21-(1 -ethyl-1 -ethoxymethylenedioxy) pregna-1,4-dlene-3.20-dione (538 mg) in acetic acid (20 ml), containing 2 drops of water, was allowed to stand at room temperature for 5 hours. Dilution of the mixture with water gave a white solid (457 mg) which, after being filtered off and dried, was recrystallized from acetone to afford 90 -fluoro-11/3,21 -dihydroxy-16/3-methy 1-170 -propionyloxypregna-1,4-diene-3, 20-dione (361 mg), MP 230°-235°C. 

A suspension of 45 g 3-phenoxycarbonyloxy-1 -methyl-7-chloro-5-pheny -1,3-dihydro-2H-1,4-benzodiazepin-2-one in 450 ml methanol is treated with stirring, with 43 ml of a solution of dimethylamine in methanol (containlng31 gdimethylamine in 100 ml). Stirring ismaintained at 20°C to 25°C during 5 hours. The reaction mixture is filtered, and the filtrate is diluted with 450 ml water. The precipitate thus formed, is 3-(N,N-dimethylcarbamoyloxy)-1-methy -7-chloro-5-phenyl-1,3-dihydro-2H-1,4-benzodiazepin-2-one, which is collected on a filter, dried and recrystallized from ethyl acetate, and has a melting point of 173°C to 174°C. 

Chemical Name 2-[2-[ 1-(4[Pg.351]

S,S)(R,R)-l-(ris-cyclopentadienyl)-3-(l-hydro.xy-l-methy ethyl)-l- triphenylphospfuine)-l-cohalta-2-cyclopentanone yield not reported... 

Chinchona alkaloids, such as quinine, are readily available quinuclidine chiral bases which have been used extensively in catalytic Michael additions239 243. Methy 1-2,3-dihydro-1-oxo-l/f-in-dene-2-carboxylate (1) is most frequently used as the Michael donor in these studies. Enantiose-lectivities as high as 76% are reached in the additions to 3-buten-2-one. Modest enantioselec-tivities (< 67%) were also obtained with ethyl 2-oxo-l-cyclohexanecarboxylate and methyl l,3-dihydto-3-oxo-l-isobcnzol urancarboxylate244 245. 

CN hexahydro-1-methy 1-4-phenyl-lH-azepine-4-carboxylie acid ethyl ester citrate (1 1)... 

Methyl-1,2,3,4-tetrahydro naphthalene Decahydro-2-methylnaphthalene Decahy dro-1 -ethyl-5 -methy lnaphthalene 1 -Methy lperhy drophenanthrene... 

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