Propenyl bromide, 2-methyl

Ethanaminium, N,N,N-triethyl-, bromide. See Tetraethylammonium bromide Ethanaminium, N,N,N-triethyl-, chloride. See Tetraethylammonium chloride Ethanaminium, N,N,N-triethyl-, hydroxide. See Tetraethylammonium hydroxide Ethanaminium, N,N,N-trimethyl-2-[(methyl-1-oxo-2-propenyl) oxy]-, chloride, homopolymer. See Polyquatemium-37 Ethanaminium, N,N,N-trimethyl-2-[(2-methyl-1-oxo-2-propenyl)oxy]-, chloride, polymer with 2-propenamide. See Polyquatemium-32 Ethanaminium, N,N,N-trimethyl-2-[(2-methyl-1-oxo-2-propenyl) oxy]-, methyl sulfate, homopolymer. See Polyquatemium-14 Ethanaminium, N,N,N-trimethyl-2-[(2-methyl-1-oxo-2-propenyl) oxy]-, methyl sulfate, polymer with 2-propenamide. See Polyquatemium-5 Ethanaminium, N,N,N-trimethyl-2-[1 -oxo-2-propenyl) oxy]-, chloride, polymer with 2-propenamide. See Polyquaternium-33 Ethane... 

Other Names 1-Ethyl-2-[3-(l-ethylnaphtho[l,2-thiazolin-2-ylidene)-2-methylpropenyl]naphtho[l,2- /] thiazoliumbromide Naphtho[l,2- flthiazolium, 1-ethyl-2- [3-( 1 -ethylnaphtho[ 1,2- /] thiazol-2( 17/)-ylidene)-2-methyl-l-propenyl]-, bromide Naphtho[l,2- flthiazo-lium, 1 -ethyl-2- [3-( 1 -ethylnaphtho[ 1,2- flthiazolin-2-ylidene)-2-methylpropenyl]-, bromide 4,5,4, 5 -Di-benzothiacarbocyanine bromide, 3,3 -diethyl-9-meth-yl- 3,3 -Diethyl-9-methyl-4,5,4, 5 -dibenzothiacarbo-cyanine bromide 3,3 -Diethyl-9-methyl-4,5,4, 5 -naphthothiacarbocyanine bromide 4,5,4, 5 -Dibenzo-3,3 -diethyl-9-methylthiacarbocyanine bromide Car-bocyanin DBTC DBTC Stains-all Merck Index Number Not listed... 

Tributyl(l-ethoxy-2-propenyl)stannane (2) was first prepared from tributyl[chloro(ethoxy)-methyl]stannane and vinylmagnesium bromide, and found to be unstable with respect to 1,3-migration of the tributyltin substituent101. Tributyl(l-ethoxy-3-methyl-2-butenyl)stannane (1) was found to be more stable, and has since been prepared directly from (tributyl)(diethoxy-methyl)stannane and 2-methylpropenylaluminum dichloride generated in situ102. 

An internal alkylation via a nitrogen ylide has also been reported7. Thus, the bromide salt of methyl 6-[dimethyl(2-propenyl)ammonio]penicillanate gives a 75% yield of methyl 6/J-dimeth-ylamino-6oi-(2-propenyl)peniciHanate (see Table 2). 

Optisch-aktive Diazotate sowie Alkylierungsmittel reagieren unter Konfigurationserhalt1. Neben den Meerwein-Salzen konnen als Alkylierungsmittel auch Alkylhalogenide, be-sonders Alkyljodide verwendet werden. Mit Allyljodid oder -bromid wird l-Allyl-2-(l-methyl-heptyl)-diazen-l-oxid erhalten, das sich zu 2-(l-Methyl-heptyl)-l-( 1-propenyl)-diazen-l-oxid umlagern lafit4 ... 

Hydroxy-4-methyl-4-penten-2-one (1) was prepared from 3-chloro-mesityl oxide using a modified procedure from the literature [ref.4], A reference sample of 4-methyl-4-penten-2,3-dione (2) was prepared from using the copper acetate method [ref.2], 4-methyl-pentan-2,3-dione (3) was purchased from Wiley Co. 2-Hydroxy-4-methyl-4-penten-3-one (4) was synthesized in 30% yield from 2-propenyl-magnesium bromide and 2-hydroxy-propionitrile in tetrahydrofurane. The structures of all compounds were confirmed by H-. C-NMR- and mass spectroscopy [ref. 5],... 

Dimethyl 3-(2-methyl-l-propenyl)-2,2-dimethylcyclopropane-l,l-dicarboxylate (324) is synthesized by the reaction of (2-halo-2-methylpropylidene)malonate (291) with 2-methyl-l-propenylmagnesium bromide (323). The cyclopropane is accompanied by the malonoester (325) and a butanolide (326) formed by nucleophilic attack of an ester enolate (equation 101) . ... 

Tris[trimethylsilyl]methyl tellurium iodide reacted with phenylmagnesium bromidebutyl tellurium bromide with vinyl magnesium bromide, vinyl tellurium iodide with butyl and 4-methoxyphenyl magnesium bromide, and 2-propenyl tellurium iodide with 4-methoxyph-enyl magnesium bromide to give the expected unsymmetric dialkyl or alkyl aryl tellurium compounds. 

This spectrophotometric method is based on the binding of a carbocyanine dye (1 -ethyl-2-[3-( 1 -ethyl-naphto[ 1,2rflthiazolin-2-ylidene)-2-methyl-propenyl]naphto [l,2rflthiazolium bromide, Stains all) to undegraded hyaluronan [34]. The unit of enzyme activity is defined as the amount of enzyme that will produce a 10% decrease in the absorbance of the dye-hyaluronan complex after one hour of incubation. 

Reaction of 2-methyl-2-butenyl bromide with lithiumtetramethylpiperidide in the presence of olefins furnishes (2-methyl-1-propenyl)cyclopropanes with moderate cis selectivity17. 

The stereochemistry of alkylation was next investigated. 2-Methylcyclohexanone (43) was treated with MeLi to afford predominantly the trans methylated product 45. However, when the aluminium compounds MAD or MAT were present, they coordinate to the carbonyl group and cause the configuration to be reversed (14). Very complex cases using other sophisticated alkylating reagents are not reported. When 2-methyl-l-propenyl magnesium bromide was reacted with the ketone 27, the isomer of natural product 46 was the... 

Analysis of Reagent Purity H NMR, IR, elemental analysis. Preparative Methods the title reagent is prepared by the reaction of 2-(methylsulfonyl)-3-phenyl-2-propenyl alcohol and phosgene (eq 1). The alcohol is obtained from the corresponding allylic bromide by formate-catalyzed hydrolysis. The synthesis of the bromide involves the Cu(OAc)2-catalyzed addition of methanesulfonyl chloride to -methylstyrene followed by elimination of hydrogen chloride and subsequent free radical bromination of the methyl group (eq 1). ... 

Benzyldimethylsulfonium bromide " opts for the [3,2]-rearrangement mode too. Allylic sulfonium salts act in the same way. Thus, 5-3-methyl-2-butenyl-5-methyl-5-(l,l-dimethyl-2-propenyl)sulfonium tetrafluoborate is converted with -butyllithium via the 5-ylide into 4-methylmercapto-2,7-dimethyl-2,6-octadiene (380) and, by reduction with sodium in liquid ammonia, into a l 4-mixture of the 2,5- and 2,6-diene (Scheme 1-296). " ... 

---