magnetic resonance, nuclear quadrupole resonance (organic substancesThe N-methyl chemical shifts in the title compounds arc reported. In the 1,3-orientation, the shift appears to be determined by resonance from the heteroatom, with the order of donating ability being NMe > O > S Se. In the ...
We have recently shown that the small proton chemical shift difference in 2-methyl-1-(methyl-d)piperidine supports a long-lived nuclear spin state. To identify additional candidate molecules with CHdoi:10.1021/acs.joc.7b01356Ogba, O. Maduka...
4. Double Bond Formation (with hydride shift rearrangements and regeneration of catalyst) C C CH 2 HC CH 3 H 3 C H H H C C CH 3 C CH 3 H 3 C H HC CH 2 CH 3 C CH 3 H 3 C + H + 2-methyl-2-pentene hydride shift ...
18 That the 1,3-acyl shift is coupled not only with singlet-state but also T2-state reactivity has been unequivocally shown by two methods. Thermal decomposition of a dioxetane, a derivative of (3a), generates predominantly the T2 state from which the 1,3-acyl shift product is formed ...
[n-Bu4N][Δ-TRISPHAT] Salt, an Efficient NMR Chiral Shift Reagent for Neutral Planar Chiral Tricarbonylchromium Complexes The determination of the enantiomeric purity of planar chiral Cr(CO)3 complexes of substituted benzaldehydes and nitrones has been conveniently carried out... H Ratni,JJ Jodr...
Contaminated clothing should not be taken home at end of shift, but should remain at employee's place of work for cleaning. View all 4.3 Cleanup Methods If a spill occurs, clean it up promptly. Don't wash it away. Instead, sprinkle the spill with sawdust, vermiculite, or kitty litter....
Oxidation of para-substituted diphenylmethylidenefluorenes results in the formation of antiaromatic fluorenyl cations, as evidenced by the paratropic shift... NS Mills,T Malinky,JL Malandra,... - 《Journal of Organic Chemistry》 被引量: 87发表: 1999年 Dications of fluorenylidenes. The relation...
Interesting applications of chemical shift increments are illustrated.doi:10.1080/07328309508006441AndréDe BruynDepartment of Organic Chemistry, University of Ghent Krijgslaan, 281 S4, B-9000, Ghent, BelgiumTaylor And FrancisJournal of Carbohydrate Chemistry...
The Lewis acidity has been measured from the 31P NMR chemical shift of a mixture of the organotin compound and triethylphosphine oxide as function of concentration. This shows that a 1 : 1 complex is formed in solution, and for comparison, the dissociation constant of the triphenyltin chloride...
The optimum temperature for the oxidation of 4-methylcatechol to 4-methylquinone by polyphenol oxidase, was observed [158] to shift from 30 °C in buffer to 45 °C in RM of AOT/cyclohexane, a result that could be due to a higher enzyme stability in the RM. Furthermore, the small diff...