Certain organic compounds have the potential to effectively alter water ice nucleation. Research data of those organic compounds that may affect ice formation in the atmopshere is still insufficient. Among those interesting compounds are the carboxylic acids which are present in the atmosphere due to different reasons. They are formed through ozonolysis of unsaturated organic compounds and are ...

Oxidative cleavage of cycloalkene-1-carboxylates, made from the corresponding carboxylic acids, and subsequent oxidation of the resulting ketoaldehyde afforded the important 1-monoesters of 2-ketoalkanedioic acids. Thus ozonolysis of octyl cyclobutene-1-carboxylate followed by sodium chlorite oxidation afforded the 1-monooctyl 2-ketoglutarate. This is a cell-permeable prodrug form of α-ketoglut...

Y. J. Li, Q. Chen, M. I. Guzman, C. K. Chan, and S. T. Martin Environmental Engineering Program, Hong Kong University of Science and Technology, Hong Kong, China School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA now at: Department of Chemistry, University of Kentucky, Lexington, KY, USA Division of Environment, Hong Kong University of Science and Technology, Hon...

Investigating the composition of organic aerosol resulting from cyclohexene ozonolysis: low molecular weight and heterogeneous reaction products J. F. Hamilton, A. C. Lewis, J. Reynolds, L. J. Carpenter, and A. Lubben Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK Bruker Daltonics, Banner Lane, Coventry, CV4 9GH, UK Received: 26 April 2006 – Accepted: 16 May 2006 – ...

3.2.3. Hydroformylation 2467 3.2.4. Dimerization 2468 3.2.5. Oxidative Cleavage and Ozonolysis 2469 3.2.6. Metathesis 2470 4. Terpenes 2472 4.1. Pinene 2472 4.1.1. Isomerization: R-Pinene 2472 4.1.2. Epoxidation of R-Pinene 2475 4.1.3. Isomerization of R-Pinene Oxide 2477 4.1.4. Hydration of R-Pinene: R-Terpineol 2478 4.1.5. Dehydroisomerization 2479 4.2. Limonene 2480 4.2.1. Isomerization 2480...

We report the first time-dependent measurements of high-molecular-weight (up to 700 amu) gas-phase oxidation products from α-pinene ozonolysis in an aerosol chamber under dry and low-NOx conditions. Measurements of products having mole fractions ranging from 10−14 to 10−11 were carried out with a chemical ionization mass spectrometer (the Cluster CIMS). Most products that were correlated with n...

Primary and secondary organic aerosols (POA and SOA) contain a complex mixture of multifunctional chemicals, many of which are photolabile. Much of the previous work that aimed to understand the chemical evolution (aging) of POA and SOA has focused on the reactive uptake of gas-phase oxidants by particles. By stripping volatile compounds and ozone from α-pinene ozonolysis SOA with three 1-m-lon...

A new method that we describe as chemical modulation of volatile hydrocarbons is investigated using ozonolysis pretreatment and membrane introduction mass spectrometry (MIMS). This extension to the MIMS technique is intended to enhance the selectivity of MIMS for measuring hydrocarbons in the complex mixtures often encountered in polluted air samples. The test samples for this study were dilute...