- Vancouver, British Columbia, Canada
Richard Pincock
University of British Columbia, Chemistry, Faculty Member
- I am a retired Professor of Chemistry who also has an interest in Ancient History (Egyptian, Greek, Roman, and Byzantine).edit
Page 1. (iii) We have tried to detect a special lability in the proximity of the amide group to the enol ether bond. Brief treatment (5 min) of the photoproduct I11 with methanolic HC1 led only to V by etherification of the allylic... more
Page 1. (iii) We have tried to detect a special lability in the proximity of the amide group to the enol ether bond. Brief treatment (5 min) of the photoproduct I11 with methanolic HC1 led only to V by etherification of the allylic hydroxyl. ...
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Page 1. 1,4-DIMETHYI,CYCLOHEXYL AND 2-METHYLNORBORNYL RADICALS J. Org. Chem., Vol. 35, No. 6, 1970 1789 It has Stereochemistry of the Reactions of Molecular Oxygen with 1,4-Dimethylcyclohexy1 and 2-Methylnorbornyl ...
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Page 1. 2040 tutes of Health for their generous support of our program. (IO) Camille and Henry Dreyfus Teacher-Scholar Grant Recipient. Barry M. Trost,*lo Mitchell J. Bogdanowicz Department of Chemistry, University of Wisconsin ...
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54, 548 (1976). Rotation around the bond joining the two naphthalene rings (ie, racemization) in 1,l'- binaphthyl is very etl'ectively catalyzed by carbon blacks and decolorizing carbons. In acetone at 20 "C where a small... more
54, 548 (1976). Rotation around the bond joining the two naphthalene rings (ie, racemization) in 1,l'- binaphthyl is very etl'ectively catalyzed by carbon blacks and decolorizing carbons. In acetone at 20 "C where a small fraction of binaphthyl is reversibly absorbed, ...
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A racemic mixture of the molecularly dissymmetric compound 1,1′-binaphthyl will spontaneously develop optical activity when melted, cooled, and allowed to crystallize. The distribution of optical rotations in individual samples shows that... more
A racemic mixture of the molecularly dissymmetric compound 1,1′-binaphthyl will spontaneously develop optical activity when melted, cooled, and allowed to crystallize. The distribution of optical rotations in individual samples shows that the resolutions occur in a truly spontaneous manner (i.e., without the influence of any external chiral agent). However, addition of small amounts of certain chiral compounds promotes the generation of one enantiomeric form of binaphthyl. The results are often not completely consistent and this suggests that the nucleation of binaphthyl is sensitive to very low concentrations of unknown chiral agents.
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Page 1. Photoinduced chlorination and bromination of haloadamantanes in tetrachloromethane and bromotrichloromethanel ROBERT R. PERKINS' AND RICHARD E. PINCOCK Deprrrttnen! of Cltet~istry, Utli18et.sity of British ...
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Page 1. Racemization of 4,4 '-Diamino-1,l'-binaphthyl J . Org. Chem., Vol. 43, No. 4, 1978 601 Solid-state Racemization of 4,4'-Diamino-1,l'-binaphthyl May Dean-Ming Lu and Richard E. Pincock* Department of Chemistry,... more
Page 1. Racemization of 4,4 '-Diamino-1,l'-binaphthyl J . Org. Chem., Vol. 43, No. 4, 1978 601 Solid-state Racemization of 4,4'-Diamino-1,l'-binaphthyl May Dean-Ming Lu and Richard E. Pincock* Department of Chemistry, Uniuersity ...
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The crystallization of 1,1'-binaphthyl from its racemic melt is an example of spontaneous generation of optical activity. The distribution of specific rotations in 200 individual samples varied from [α ]D = -218 degrees to [α ]D = +206... more
The crystallization of 1,1'-binaphthyl from its racemic melt is an example of spontaneous generation of optical activity. The distribution of specific rotations in 200 individual samples varied from [α ]D = -218 degrees to [α ]D = +206 degrees with a mean of +0.14 degree and standard deviation of 86.4 degrees. This resolution into enantiomers is determined by chance development, with equal probability, of right- or left-handed crystallites; it can b2 controlled and made stereospecific by addition of dissymmetric compounds at low concentrations.
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Page 1. 1474 Thermally Induced Resolution of Racemic 1 , 1'-Binaphthyl in the Solid State Keith R. Wilson and Richard E. Pincock* Contribution from the Department of Chemistry, University of British Columbia, Vancouver, Canada, V4T 1... more
Page 1. 1474 Thermally Induced Resolution of Racemic 1 , 1'-Binaphthyl in the Solid State Keith R. Wilson and Richard E. Pincock* Contribution from the Department of Chemistry, University of British Columbia, Vancouver, Canada, V4T 1 W5. Received July 29, 1974 ...
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Page 1. 3020 is to be noted that the radical spectra produced by hot fragment attack are better resolved than those produced by radiolysis, and therefore at least as free of contri-bution from more than one radical. Comparison with Other... more
Page 1. 3020 is to be noted that the radical spectra produced by hot fragment attack are better resolved than those produced by radiolysis, and therefore at least as free of contri-bution from more than one radical. Comparison with Other Systems. ...
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Page 1. THE JOURNAL OF Organic Chemistry DECEMBER 16, 1963 Q Copyright 1963 by the American Chemical Society VOLUME 28, NUMBER 12 Mechanism of the Benzidine Rearrangement. Vl Acid-Catalyzed Decomposition ...
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Page 1. 6332 COMMUNICATIONS TO THE EDITOR VOl. 81 CONTROLLED FORMATION OF cis-AND trans-DECALIN-9-CARBOXYLIC ACIDS BY CARBONYLATION Sir: Koch and Haaf' have described the preparationof decalin ...
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Page 1. Bridgehead free radical stability. The decomposition of t-butylperoxyesters of the 1-adamantyl, 1-bicyclo[2 * 2 21 octyl, and 1-norbornyl systems LEONARD B. HUMPHREY,' BRUCE HODGSON,~ AND RICHARD E. PIN ...
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The 13C chemical shifts of the sixteen bridgehead substituted mono-, di-, tri- and tetrahaloadamantanes (halo = F, Cl, Br, I) and four mixed 1,3-dihaloadamantanes are reported. The effect of bridgehead halogens on the shift values of... more
The 13C chemical shifts of the sixteen bridgehead substituted mono-, di-, tri- and tetrahaloadamantanes (halo = F, Cl, Br, I) and four mixed 1,3-dihaloadamantanes are reported. The effect of bridgehead halogens on the shift values of carbons in β and δ positions is well correlated by the simple additivity relationship based on substituent shifts of 1-monohaloadamantanes. A substituted α-carbon is shifted upfield with an increase in the number of halogens at other bridgehead positions and this shift is relatively greater in the order F < Cl < Br < I. This observed upfield shift of α-carbons is opposite to the downfield shift expected from additivity. An unsubstituted bridgehead γ-carbon is moved to lower fields by one, two and three bromines (or iodines) at other bridge-heads while, in contrast, a third fluorine weakly shields the remaining unsubstituted γ-carbon. Some special noncumulative effects of halogens operating across the 1,3-bridgehead positions of adamantane are indicated by the data. The 19F chemical shifts of 1-fluoro-, 1,3-difluoro-, 1,3,5-trifluoro- and 1,3,5,7-tetrafluoroadamantanes are contrary to expectations based on inductive effects in that they move progressively upfield. Other 1-fluoroadamantanes with chloro, bromo, or methyl groups present also show substituent-induced chemical shifts which shield the fluorine.
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Page 1. An optically inactive substance may, without interven-tion of a chemical or physical resolving agent, sponta-neously develop optical activity. This simple, matter of fact statement is usually not immediately accepted as ...
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Page 1. The kinetics of the solid state transformation of racemic to optically active 1, 1 '-binaphthyl KEITH R. WILSON AND RICHARD E. PINCOCK The Dcportrr1er7t ofClzeriiiatr?.. fJr~i~.cr.sity of British Co/iir?7hici. Vcir~coii\,cr,... more
Page 1. The kinetics of the solid state transformation of racemic to optically active 1, 1 '-binaphthyl KEITH R. WILSON AND RICHARD E. PINCOCK The Dcportrr1er7t ofClzeriiiatr?.. fJr~i~.cr.sity of British Co/iir?7hici. Vcir~coii\,cr, BC, Crir~citlri V6T1 W5 Received August 24, 1976 ...
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Page 1. ACCOUNTS OF CHEMCAL RESEARCH VOLUME 2 NUMBER 4 APRIL , 1 9 6 9 Reactions in Frozen Systems RICHARD E. PINCOCK Department o,f Chemistry, University of British Columbia, Vancower 8, British Columbia, Canada Received October 28, I968... more
Page 1. ACCOUNTS OF CHEMCAL RESEARCH VOLUME 2 NUMBER 4 APRIL , 1 9 6 9 Reactions in Frozen Systems RICHARD E. PINCOCK Department o,f Chemistry, University of British Columbia, Vancower 8, British Columbia, Canada Received October 28, I968 ...
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Page 1. Richard E. Pincock and Thomas E. Kiovsky 1 Kinetics of Reactions University of British Columbia Vancouver, Canada I in Frozen SO ~ U ~ ~ O ~ S Recent studies (1-4) have shown that several types of bimolecular reactions ...
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Page 1. BIOCHEMISTRY Denaturation and Reactivity of Invertase in Frozen Solutions* Min-Min Tong and Richard E. Pincock? ABSTRACT : Comparisons of frozen and supercooled solutions of yeast invertase show that this ...
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Page 1. 1669 Thermal Racemization of ( + ) -Bicyclo [2.2.1] hept-5-ene-trans-2,3-dicarboxylic Acid in the Melted and Solid States' Richard E. Pincock, Min-Min Tong, and Keith R. Wilson Contribution from the Department of ...
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Page 1. PAuCl and Ph3PAgCI do not form adducts with tetra-chloro-l,2-benzoquinone. Acknowledgment. This research was supported by Grant No. AM 12182 from the US Public Health Service. found in (1,4-02CsH4),M(PPha ...