Efficient syntheses of climate relevant isoprene nitrates and (1<i>R</i>,5<i>S</i>)-(−)-myrtenol nitrate
作者:Sean P Bew、Glyn D Hiatt-Gipson、Graham P Mills、Claire E Reeves
DOI:10.3762/bjoc.12.103
日期:——
chemoselective synthesis of several important, climate relevant isoprene nitrates using silver nitrate to mediate a 'halide for nitrate' substitution. Employing readily available starting materials, reagents and Horner-Wadsworth-Emmons chemistry the synthesis of easily separable, synthetically versatile 'key building blocks' (E)- and (Z)-3-methyl-4-chlorobut-2-en-1-ol as well as (E)- and (Z)-1-((2-met
Pulse radiolysis was used to study the kinetics of the reactions of CH3C(O)CH2O2 radicals with NO and NO2 at 295 K. By monitoring the rate of formation and decay of NO2 using its absorption at 400 and 450 nm the rate constants k(CH3C(O)CH2O2 + NO) = (8 +/- 2) X 10(-12) and k(CH3C(O)CH2O2 + NO2) = (6.4 +/- 0.6) x 10(-12) cm(3) molecule(-1) s(-1) were determined. Long path length Fourier transform infrared spectrometers were used to investigate the IR spectrum and thermal stability of the peroxynitrate, CH3C(O)CH2O2NO2. A Value of k(-6) approximate to 3 s(-1) was determined for the rate of thermal decomposition of CH3C(O)CH2O2NO2 in 700 torr total pressure of O-2 diluent at 295 K. When combined with lower temperature studies (250-275 K) a decomposition rate of k(-6) = 1.9 x 10(16 )exp (-10830/T) s(-1) is determined. Density functional theory was used to calculate the IR spectrum of CH3C(O)CH2O2NO2. Finally, the rate constants for reactions of the CH3C(O)CH2 radical with NO and NO2 were determined to be k(CH3C(O)CH2 + NO) = (2.6 +/- 0.3) x 10(-11) and k(CH3C(O)CH2 + NO2) = (1.6 +/- 0.4) x 10(-11) cm(3) molecule(-1) s(-1). The results are discussed in the context of the atmospheric chemistry of acetone and the long range atmospheric transport of NOx. (C) John Wiley & Sons, Inc.
MCKILLOP A.; YOUNG D. W.; EDWARDS M.; HUG R. P., J. ORG. CHEM., 1978, 43, NO 19, 3773-3774
作者:MCKILLOP A.、 YOUNG D. W.、 EDWARDS M.、 HUG R. P.