Results 21 to 30 of about 3,642 (245)

C1-C8 volatile organic compounds in the atmosphere of Hong Kong: Overview of atmospheric processing and source apportionment [PDF]

open access: yes, 2007
We present measurements of C1-C8 volatile organic compounds (VOCs) at four sites ranging from urban to rural areas in Hong Kong from September 2002 to August 2003. A total of 248 ambient VOC samples were collected.
Barletta, B   +5 more
core   +1 more source

Insertion of [1.1.1]propellane into aromatic disulfides

open access: yesBeilstein Journal of Organic Chemistry, 2019
Herein we present the synthesis of symmetrically and unsymmetrically substituted 1,3-bissulfanylbicyclo[1.1.1]pentanes from disulfides and [1.1.1]propellane.
Robin M. Bär   +4 more
doaj   +1 more source

Emission characteristics of nonmethane hydrocarbons from private cars and taxis at different driving speeds in Hong Kong [PDF]

open access: yes, 2011
Vehicular emissions are the major sources of a number of air pollutants including nonmethane hydrocarbons (NMHCs) in urban area. The emission composition and emission factors of NMHCs from vehicles are currently lacking in Hong Kong.
Blake, DR   +4 more
core   +1 more source

Enantioselective Organocatalytic α-Fluorination of Aldehydes [PDF]

open access: yes, 2005
The first direct enantioselective catalytic α-fluorination of aldehydes has been accomplished. The use of enamine catalysis has provided a new organocatalytic strategy for the enantioselective fluorination of aldehydes to generate α-fluoro aldehydes, an ...
Beeson, Teresa D.   +1 more
core   +1 more source

Organocatalytic Vinyl and Friedel−Crafts Alkylations with Trifluoroborate Salts [PDF]

open access: yes, 2007
Herein we report the first use of vinyl and heteroaryl trifluoroborate salts as viable substrates for amine-catalyzed conjugate additions. The application of LUMO-lowering iminium catalysis has enabled the highly regio- and enantioselective 1,4-addition ...
Lee, Sandra, MacMillan, David W. C.
core   +1 more source

Characterization of volatile organic compounds at a roadside environment in Hong Kong: An investigation of influences after air pollution control strategies [PDF]

open access: yes, 2015
Vehicular emission is one of the important anthropogenic pollution sources for volatile organic compounds (VOCs). Four characterization campaigns were conducted at a representative urban roadside environment in Hong Kong between May 2011 and February ...
Blake, DR   +11 more
core   +1 more source

Optimal Fractionation of Products of Refining Straight-run Gasoline on Zeolite Catalyst with Account of its Deactivation [PDF]

open access: yes, 2014
Flowsheet of industrial refining straight-run gasoline on zeolite catalyst includes the necessary stage of fractionation of conversion products to produce commercial gasoline, gas and heavy residue. Changes in qualitative and quantitative compositions of
Laktionova, E. A.   +4 more
core   +2 more sources

Strain-release transformations of bicyclo[1.1.0]butanes and [1.1.1]propellanes

open access: yesTetrahedron Chem
Bicyclo[1.1.0]butanes (BCBs) and [1.1.1]propellanes (tricyclo[1.1.1.01,3]pentanes, TCPs) are structurally unique compounds with different chemical properties.
Qian-Qian Hu   +4 more
doaj   +1 more source

Design and fabrication of chemically robust three-dimensional microfluidic valves [PDF]

open access: yes, 2007
A current problem in microfluidics is that poly(dimethylsiloxane) (PDMS), used to fabricate many microfluidic devices, is not compatible with most organic solvents. Fluorinated compounds are more chemically robust than PDMS but, historically, it has been
Chen, Yan   +7 more
core   +2 more sources

Predicting and Rationalizing Piezoelectricity in Racemic Bioorganic Molecular Crystals

open access: yesAngewandte Chemie, EarlyView.
Racemic molecular crystals, composed of equal mixtures of chiral enantiomeric components, are predicted to exhibit significant piezoelectric responses and favourable mechanical flexibility. This study identifies organic and bioorganic racemates as promising candidates for sustainable, lead‐free materials, enabling next‐generation applications in energy
Shubham Vishnoi, Sarah Guerin
wiley   +2 more sources

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