GC/MS SEPARATION AN IDENTIFICATION OF THE C5H10 ISOMERS. APPLICATION TO THE Hg 6(3P1) PHOTOSENSITIZED REACTIONS OF cis-2-PENTENE, 1-PENTENE AND trans-1,2-DIMEHYLCYCLOPROPANE
✍ Scribed by George R. De Maré; Marc Termonia
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2010
- Weight
- 444 KB
- Volume
- 104
- Category
- Article
- ISSN
- 0037-9646
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✦ Synopsis
The analysis (separation and identification) of eleven C,H,, isomers is performed using coupled GC/MS with a 70 m glass capillary column containing a 2.5 pm thick film of P a 2 5 as stationary phase. Cryogenic €20, cooling improves the separations. The total analysis time is lees than 12 minutes.
Some mechanistic details on the Hg q3P,) (hereafter denoted by Hg? photweneitization of the title compounds are elucidated. Thus the Hg' photmmaitization of cis-2-pentene at 20 Tom yields methylcyclobutane with a quantum yield e = 0.1, not ethylcyclopropane as was previously thought. (Ethylcyclopropane is formed in trace quantities.) The photostationary state for the Hg' wnritization of the 2-pentenes is confirmed to corrtspond to the concentration ratio [trons]/[cis] = 1.00. ~~-1,2-dimethylcycloprope is a product of the Hg' photosensitization of 1-pentene. The major products of the Hg' photosensitization of tru~-1,2-dimethylcycloprop.ne at 80 Tom are 3-mcthyl-l-butene, tronsand cir-2-pentene and cis-l.2-dimethylcyclopropure which are all formed with quantom yields near 0.1 and in the ratios 1.