- Gas-phase reaction of two unsaturated ketones with atomic Cl and O3: Kinetics and products
-
The rate constants and products for the reactions of atomic Cl and O3 molecule with 3-methyl-3-buten-2-one (MBO332) and 3-methyl-3-penten-2-one (MPO332) were determined in a 100 L Teflon chamber at 293 ± 1 K and atmospheric pressure. For MBO332 and MPO332, the rate constants measured with atomic Cl were (2.38 ± 0.26) × 10-10 and (3.00 ± 0.34) × 10-10 cm3 molecule-1 s-1 using the relative rate method. Using the absolute rate method, the rate constants with O3 measured were (1.18 ± 0.21) × 10-17 and (4.07 ± 0.45) × 10-17 cm3 molecule-1 s-1. The products of these reactions were investigated by the proton-transfer-reaction mass spectrum (PTR-MS). The results indicated that the major products observed in the atomic Cl reaction were formaldehyde together with chloroacetone for MBO332, and acetaldehyde and CH3C(O)C(O)Cl for MPO332. For O3 reactions, butanedione and formaldehyde were the main products of MBO332, while butanedione and acetaldehyde were the main products of MPO332. Possible reaction mechanisms were proposed and discussed and the atmospheric implications of these reactions were also discussed.
- Wang, Jing,Zhou, Li,Wang, Weigang,Ge, Maofa
-
p. 12000 - 12012
(2015/05/26)
-
- Formation of macrocyclic lactones in the Paterno-Buechi dimerization reaction
-
Furan-2-ylmethyl 2-oxoacetates 1a,b, in which the furan ring and the carbonyl moiety were embedded intramolecularly, were synthesized from commercially available furan-2-ylmethanol and their photochemical reaction (hv > 290 nm) was investigated. Twelve-membered macrocyclic lactones 2a,b with Ci symmetry including two oxetane-rings, which are the Paterno-Buechi dimer-ization products, were isolated in ca. 20% yield. The intramolecular cyclization products, such as 3-alkoxyoxetane and 2,7-dioxabi-cyclo[2.2.1]hept- 5-ene derivatives, were not detected in the photolysate.
- Arimura, Junya,Mizuta, Tsutomu,Hiraga, Yoshikazu,Abe, Manabu
-
supporting information; experimental part
p. 265 - 269
(2011/05/30)
-