Electrophilic Substituent Constants

An excellent linear relationship is observed between log (k/kH) for sixteen meta substituted t-cumyl chlorides and the Hammett meta substituent constants. The reaction constant, -4.54, is used to calculate a total of forty-one electrophi...

HC Brown，Y Okamoto - 《Journal of the American Chemical Society》

Relative Rates and Isomer Distributions in the Aluminum Chloride-Catalyzed Acetylation of the Halobenzenes in Ethylene Dichloride. Partial Rate Factors for the Acetylation Reaction

The gallium bromide-catalyzed reactions of ethyl bromide with the halobenzenes have been examined in ethylene dichloride solution at 25掳. Using a competitive method, the rate of ethylation of fluorobenzene relative to benzene has been d...

HC Brown，G Marino - 《Journal of the American Chemical Society》

Generation and synthetic applications of 2-lithio-1,3-dithianes

Four levels of shading (full sunlight (0%), 30, 50, 70% of solar radiation interception on growth, chlorophyll concentration and photosynthetic rate were s...

D Seebach，EJ Corey - 《Journal of Organic Chemistry》

LITHIUM DIETHOXYALUMINOHYDRIDE AS A SELECTIVE REDUCING AGENT—THE REDUCTION OF DIMETHYLAMIDES TO ALDEHYDES

The position that the importance of neighboring group participation should diminish as an incipient cationic center is stabilized by substitution1 appears to be generally accepted.2 Consequently, we undertook to synthesize representative...

HC Brown，A Tsukamoto - 《J.am.chem.soc》

Electrophilic substitution in indoles—II: The formation of 3,3-spirocyclic indole derivatives from tryptamines and their rearrangement to β-carbolines

Attempts to isolate 3,3- spiro-cyclicindolenines thought to be intermediates in the cyclization of benzylidenetryptamines to tetrahydro-β-carbolines are described. One such spiro-pyrrolidinoindolenine, prepared by an alternative route f...

AH Jackson，AE Smith - 《Tetrahedron》

Potential antileprotic agents. 3. Inhibition of mycobacterial dihydrofolic reductase by 2,4-diamino-5-methyl-6-alkylquinazolines

DeGraw JI, Brown VH, Colwell WT.

JI Degraw，VH Brown，WT Colwell - 《Journal of Medicinal Chemistry》

PIEZOSPECTROSCOPIC DETERMINATION OF THE SYMMETRY OF THE CRYSTAL FIELD ACTING ON TRIVALENT IONS OF RARE EARTHS IN THE FLUORITE LATTICE

Not Available

Kaplyanskii，A.A，Medvedev，... - 《Optics & Spectroscopy》

Selective reductions. XIX. Rapid reaction of carboxylic acids with borane-tetrahydrofuran. Remarkably convenient procedure for the selective conversion of ...

Selective reductions. XIX. Rapid reaction of carboxylic acids with borane-tetrahydrofuran. Remarkably convenient procedure for the selective conversion of ...

NMYNM Yoon，CSPCS Pak，HC Brown，... - 《Cheminform》

Relative Rates and Isomer Distribution in the Aluminum Chloride-catalyzed Benzenesulfonylation of Benzene and Toluene in Benzenesulfonyl Chloride Solution. Partial Rate Factors for the Benzenesulfonylation Reaction 1,2

Selective reductions. XIX. Rapid reaction of carboxylic acids with borane-tetrahydrofuran. Remarkably convenient procedure for the selective conversion of ...

FR Jensen，HC Brown - 《Journal of the American Chemical Society》

Reactions of Diborane with Alkali Metal Hydrides and Their Addition Compounds. New Syntheses of Borohydrides. Sodium and Potassium Borohydrides1

In the presence of diethyl ether, lithium hydride reacts readily with diborane to form lithium borohydride: LiH + 1/2-B2H6 → LiBH4. The latter is also formed by reaction of diborane with either lithium ethoxide or lithium tetramethoxybo...

HI Schlesinger，HC Brown，HR Hoekstra，... - 《Journal of the American Chemical Society》