Hashish. 26. Factors influencing double-bond stability in cannabinoids

1981 ◽  
Vol 46 (5) ◽  
pp. 949-953 ◽  
Author(s):  
Haldean C. Dalzell ◽  
David B. Uliss ◽  
G. Richard Handrick ◽  
Raj K. Razdan
Keyword(s):  
Double Bond ◽  
Bond Stability ◽  
Factors Influencing

ChemInform Abstract: HASHISH. 26. FACTORS INFLUENCING DOUBLE-BOND STABILITY IN CANNABINOIDS

1981 ◽  
Vol 12 (28) ◽  
Author(s):  
H. C. DALZELL ◽  
D. B. ULISS ◽  
G. R. HANDRICK ◽  
R. K. RAZDAN
Keyword(s):  
Double Bond ◽  
Bond Stability ◽  
Factors Influencing

The Reaction of 5-Substituted-2-Norbornenes with Phenylselenyl Chloride

2008 ◽  
Vol 61 (4) ◽  
pp. 283 ◽  
Author(s):  
D. Alan R. Happer ◽  
Thomas Francis ◽  
Jonathan M. White
Keyword(s):  
Double Bond ◽  
Product Distribution ◽  
Major Product ◽  
Factors Influencing

In dichloromethane, 5-substituted-2-norbornenes add phenylselenyl chloride across the double bond to give adducts in which the phenylselanyl substituent is exo and the chloro endo. The relative yields of the two regioisomeric adducts are reported for several of these. For most, the formation of the 2-chloro-3-phenyselanyl adduct is favoured. The main exceptions are when the 5-substituent is exo and a good resonance donor, where the 3-chloro-2-phenylselanyl adduct is the major product. Possible factors influencing the product distribution are discussed.

Reactions of stabilized phosphoranes with enol lactones

1977 ◽  
Vol 30 (7) ◽  
pp. 1629 ◽  
Author(s):  
PJ Babidge ◽  
RA Massy-Westropp
Keyword(s):  
Double Bond ◽  
Carbonyl Group ◽  
Ester Group ◽  
Carbonyl Groups ◽  
Ketone Group ◽  
Mild Conditions ◽  
Lactone Carbonyl ◽  
Factors Influencing ◽  
Group Reaction

Enol lactones in which the double bond is conjugated with an ester group react with ethoxycarbonyl-methylenetriphenylphosphoraneunder mild conditions to yield the normal Wittig product, derivedfrom the lactone carbonyl group. When the double bond is conjugated with a ketone group reaction occurs at both carbonyl groups. Factors influencing reactivity are discussed.

Phosphates d'énols-X. Détermination des isomères géométriques diversement substitués par résonance magnétique nucléaire

1973 ◽  
Vol 51 (20) ◽  
pp. 3412-3427 ◽  
Author(s):  
Emile M. Gaydou
Keyword(s):  
Double Bond ◽  
Coupling Constants ◽  
Factors Influencing ◽  
Shielding Constants ◽  
Résonance Magnétique

The E and Z configuration of enol phosphates substituted on the first carbon of the double bond are determined, in 27 cases, using [Formula: see text] coupling constants and the Tobey-Pascual substituent shielding constants method. The factors influencing [Formula: see text] and [Formula: see text] coupling constants are discussed.

scholarly journals Alkene selenenylation: A comprehensive analysis of relative reactivities, stereochemistry and asymmetric induction, and their comparisons with sulfenylation

2011 ◽  
Vol 7 ◽  
pp. 744-758 ◽  
Author(s):  
Vadim A Soloshonok ◽  
Donna J Nelson
Keyword(s):  
Double Bond ◽  
Theoretical Data ◽  
Comprehensive Analysis ◽  
Asymmetric Induction ◽  
Steric Effects ◽  
Addition Reactions ◽  
Electronic Effects ◽  
Broad Perspective ◽  
Factors Influencing ◽  
Electronic And Steric Effects

A broad perspective of various factors influencing alkene selenenylation has been developed by concurrent detailed analysis of key experimental and theoretical data, such as asymmetric induction, stereochemistry, relative reactivities, and comparison with that of alkene sulfenylation. Alkyl group branching α to the double bond was shown to have the greatest effect on alkene reactivity and the stereochemical outcome of corresponding addition reactions. This is in sharp contrast with other additions to alkenes, which depend more on the degree of substitution on C=C or upon substituent electronic effects. Electronic and steric effects influencing asymmetric induction, stereochemistry, regiochemistry, and relative reactivities in the addition of PhSeOTf to alkenes are compared and contrasted with those of PhSCl.

On the regioselectivity of free radical processes ; reactions of benzoyloxy, phenyl and t-butoxy radicals with some α,β-unsaturated esters

1983 ◽  
Vol 36 (8) ◽  
pp. 1573 ◽  
Author(s):  
G Moad ◽  
E Rizzardo ◽  
DH Solomon
Keyword(s):  
Free Radical ◽  
Double Bond ◽  
Methyl Methacrylate ◽  
Methyl Acrylate ◽  
Hydrogen Abstraction ◽  
Free Radical Processes ◽  
Unsaturated Esters ◽  
Factors Influencing ◽  
Radical Processes

The reactions of three electrophilic radicals, benzoyloxy, phenyl, and t-butoxy, have been examined with a series of α, β unsaturated esters; methyl acrylate, methyl methacrylate, and methyl crotonate. For the three monomers the ratio of hydrogen abstraction to double bond addition was found to increase and the ratio of head against tail addition to decrease in the series: benzoyloxy; phenyl; t-butoxy. Relative rates for these reactions have been determined and the factors influencing the mode of reaction are discussed.

Factors influencing adhesive bonding at the bone/implant interface

1992 ◽  
Vol 50 (2) ◽  
pp. 1114-1115
Author(s):  
Julie A. Martini ◽  
Robert H. Doremus
Keyword(s):  
Electron Microscopy ◽  
Adhesive Bonding ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Bone Implant ◽  
Factors Influencing ◽  
Lr White ◽  
Transmission Electron ◽  
New Zealand White Rabbits ◽  
Scanning Electron

Tracy and Doremus have demonstrated chemical bonding between bone and hydroxylapatite with transmission electron microscopy. Now researchers ponder how to improve upon this bond in turn improving the life expectancy and biocompatibility of implantable orthopedic devices.This report focuses on a study of the- chemical influences on the interfacial integrity and strength. Pure hydroxylapatite (HAP), magnesium doped HAP, strontium doped HAP, bioglass and medical grade titanium cylinders were implanted into the tibial cortices of New Zealand white rabbits. After 12 weeks, the implants were retrieved for a scanning electron microscopy study coupled with energy dispersive spectroscopy.Following sacrifice and careful retrieval, the samples were dehydrated through a graduated series starting with 50% ethanol and continuing through 60, 70, 80, 90, 95, and 100% ethanol over a period of two days. The samples were embedded in LR White. Again a graduated series was used with solutions of 50, 75 and 100% LR White diluted in ethanol.

Factors Influencing Electrophysiologic Responsivity in Normal Adults

1965 ◽  
Vol 8 (4) ◽  
pp. 323-347
Author(s):  
Robert Goldstein ◽  
Benjamin RosenblÜt
Keyword(s):  
Conditioned Stimulus ◽  
White Light ◽  
Pure Tone ◽  
Alpha Rhythm ◽  
White Women ◽  
White Men ◽  
Inverse Relation ◽  
Factors Influencing ◽  
Electrodermal Responses ◽  
Normal Adults

Electrodermal and electroencephalic responsivity to sound and to light was studied in 96 normal-hearing adults in three separate sessions. The subjects were subdivided into equal groups of white men, white women, colored men, and colored women. A 1 000 cps pure tone was the conditioned stimulus in two sessions and white light was used in a third session. Heat was the unconditioned stimulus in all sessions. Previously, an inverse relation had been found in white men between the prominence of alpha rhythm in the EEG and the ease with which electrodermal responses could be elicited. This relation did not hold true for white women. The main purpose of the present study was to answer the following questions: (1) are the previous findings on white subjects applicable to colored subjects? (2) are subjects who are most (or least) responsive electrophysiologically on one day equally responsive (or unresponsive) on another day? and (3) are subjects who are most (or least) responsive to sound equally responsive (or unresponsive) to light? In general, each question was answered affirmatively. Other factors influencing responsivity were also studied.

Factors Influencing Pressure in the Portal Vein as Studied in the Intact Animal

1950 ◽  
Vol 16 (1) ◽  
pp. 194-210 ◽  
Author(s):  
Frederick W. Hoffbauer ◽  
Jesse L. Bollman ◽  
John L. Grindlay
Keyword(s):  
Portal Vein ◽  
Intact Animal ◽  
Factors Influencing
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