Zobrazeno 1 - 10
of 239
pro vyhledávání: '"Robert R. Fraser"'
Publikováno v:
The Journal of Organic Chemistry. 62:6164-6176
The relative rates of hydride addition to the carbonyl group of the conformationally fixed bridged biaryl ketone, 1, and its α derivatives bearing methyl, methylthio, methoxy, chloro, and fluoro substituents in axial-like and equatorial-like orienta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5a777fc1f5ce07b1f30504ce0c08b0fe
https://doi.org/10.1021/jo970428p
https://doi.org/10.1021/jo970428p
Autor:
Neil C. Faibish, Robert R. Fraser
Publikováno v:
Canadian Journal of Chemistry. 73:88-94
The value for the equilibrium constant representing the ratio of equatorial to axial conformers for 2-methylthio- and 2-methoxycyclohexanone has been measured in five solvents using 500 MHz 1H nuclear magnetic resonance. In cyclohexane solvent, the m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8c76b9faf78940828cc49d67ecaf4625
https://doi.org/10.1139/v95-013
https://doi.org/10.1139/v95-013
Publikováno v:
Canadian Journal of Chemistry. 72:1481-1488
The crystal structures for four α-chloro derivatives 2–5 of the titled ketone 1 have been determined, confirming their earlier assignments of stereochemistry. Variations in the conformations of 2–5 suggested some flexibility in the central seven
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3612709f0d57d1c71e5feaf4c4e70de5
https://doi.org/10.1139/v94-184
https://doi.org/10.1139/v94-184
Publikováno v:
Carbohydrate Research. 258:49-58
The title 1,2-anhydro sugar ( 8 ) was synthesized from d -xylose. The key intermediate for the synthesis was 2- O -acetyl-3,4-di- O -benzyl-β- d -xylopyranosyl fluoride, which was transformed into crystalline 8 by ring closure with potassium tert -b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::02a4158c735e465599aeac7f61653ac3
https://doi.org/10.1016/0008-6215(94)84074-1
https://doi.org/10.1016/0008-6215(94)84074-1
Publikováno v:
The Journal of Organic Chemistry. 58:4431-4440
The relative rates for the acid-catalyzed addition of H 2 18 O to the carbonyl group of the conformationally fixed bridged biaryl ketone, 1, and several derivatives bearing methyl, chloro, and methoxy substituents in axial-like and equatorial-like or
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::19085046903a308cca5ce4a4dbe4b16d
https://doi.org/10.1021/jo00068a044
https://doi.org/10.1021/jo00068a044
Publikováno v:
Canadian Journal of Chemistry. 71:685-694
The crystal structures for the title compound 1 and its α-methyl derivatives 2–4 have been determined. Molecular mechanics calculations of the conformation of minimum energy for 1, 3, and 4 correspond closely to the symmetric structures observed i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0118d0e0e8d661c124a350cd01f76acb
https://doi.org/10.1139/v93-093
https://doi.org/10.1139/v93-093
Publikováno v:
ChemInform. 24
The crystal structures for the title compound 1 and its α-methyl derivatives 2–4 have been determined. Molecular mechanics calculations of the conformation of minimum energy for 1, 3, and 4 correspond closely to the symmetric structures observed i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5a3cbc7c801ea26ab554f6761676ebeb
https://doi.org/10.1002/chin.199347169
https://doi.org/10.1002/chin.199347169
Publikováno v:
ChemInform. 29
The relative rates of hydride addition to the carbonyl group of the conformationally fixed bridged biaryl ketone, 1, and its α derivatives bearing methyl, methylthio, methoxy, chloro, and fluoro substituents in axial-like and equatorial-like orienta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e21577d6a60d4a9136b727654d484908
https://doi.org/10.1002/chin.199803044
https://doi.org/10.1002/chin.199803044
Publikováno v:
Canadian Journal of Chemistry. 55:3456-3463
The conformational properties of seven 5,6,7,12-tetrahydrodibenzo[a,d]cyclooctenes bearing substituents at C-6 have been studied using variable temperature proton nmr spectroscopy. The position of the equilibrium between boat-chair (BC) and twist-boa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d5be6cd0f237bbac1390c04f6f21d41e
https://doi.org/10.1139/v77-484
https://doi.org/10.1139/v77-484
Autor:
Robert R. Fraser, Fanzuo Kong
Publikováno v:
Synthetic Communications. 18:1071-1077
Chlorination using trimethylchlorosilane and dimethylsulfoxide with bromide ion catalysis afforded almost quantitative yields for 1,3-diphenylacetone, benzoylacetone and propiophenone, and acceptable yields for acetophenone, acetylacetone and cyclohe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::906105e216261050ea39d64b4b40750a
https://doi.org/10.1080/00397918808060892
https://doi.org/10.1080/00397918808060892