REFLECTION The alkyl group is a - - I + R substituent
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Effect of a chiral 4-alkyl substituent in hallucinogenic amphetamines.
The potency of hallucinogenic amphetamine derivatives of the 1-(2,5-dimethoxy-4-alkylphenyl)-2-aminopropane type drops dramatically when the length of the 4-alkyl substituent exceeds propyl or when the substituent is branched. This investigation was directed toward evaluating changes in behavioral and biochemical pharmacology resulting from introducing chirality into the 4-alkyl group of such a...
متن کاملThe Alkyl Inductive Effect, II Theoretical Calculation of Inductive Parameters
H a r r y F . W i d i n g a n d L e o n a r d S . L e v i t t Department of Chemistry, College o f Science, The University o f Texas at El Paso, El Paso, Texas 79968 Z. Naturforsch. 34b , 321 -326 (1979) ; received August 29, 1978 Alkyl Induct ive Ef fect , Induct ive Substituent Constants of Alkyl Groups Three models o f alkyl groups, " d e r e a l i z a t i o n " , " throughthe -bond" , and "...
متن کاملThe kinetics of inhibition of human acetylcholinesterase and butyrylcholinesterase by two series of novel carbamates.
Controlled inhibition of brain acetyl- and butyrylcholinesterases (AChE and BChE, respectively) and of monoamine oxidase-B (MAO-B) may slow neurodegeneration in Alzheimer's and Parkinson's diseases. It was postulated that certain carbamate esters would inhibit AChE and BChE with the concomitant release in the brain of the OH-derivatives of rasagiline or selegiline that can serve as inhibitors o...
متن کاملNano-TiCl4.SiO2: A Versatile and Efficient Catalyst for Synthesis of 14-aryl or alkyl-14H-dibenzo[a,j]xanthenes
Nano-silica supported titanium tetrachloride (TiCl4.SiO2) was prepared and used as an acid catalyst for the 14-aryl or alkyl-14H-dibenzo[a,,j]xanthenesreaction under solvent-free conditions. Compared to the classical 14-aryl or alkyl-14H-dibenzo[a,j]xanthenesreaction conditions, this method consistently has the advantage of excellent yie...
متن کاملTransition state for beta-hydride elimination in alkyl groups on Pt(111).
The transition state for beta-hydride elimination in alkyl groups on the Pt(111) surface has been probed by studying the effects of fluorine substitution on the barriers to beta-hydride elimination, DeltaE++(betaH). Four different fluoroalkyl groups have been formed on the Pt(111) surface by dissociative adsorption of four fluoroalkyl iodides: RCH(2)CH(2)-I (R = CF(3), CF(3)CH(2), and CF(3)CF(2...
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تاریخ انتشار 2017