Primary Photoreactions of the 3',5'-Dimethoxybenzoin Cage and Determination of the Release Rate in Polar Media

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• 作者：Hassen Boudebous ; Berta Ko//pubs.acs.org/images/entities/scaron.gif" border="0">mrlj ; Boris //pubs.acs.org/images/entities/Scaron.gif" border="0">ket ; Jakob Wirz
• 刊名：Journal of Physical Chemistry A
• 出版年：2007
• 出版时间：April 19, 2007
• 年：2007
• 卷：111
• 期：15
• 页码：2811 - 2813
• 全文大小：141K
• 年卷期：v.111,no.15(April 19, 2007)
• ISSN：1520-5215

文摘

3',5'-Dimethoxybenzoin (DMB) is an important photoremovable protecting group. The primary photoreactionsof DMB acetate and fluoride following photoexcitation by a subpicosecond laser flash were investigated bypump-probe spectroscopy. The primary photoproduct is identified as a preoxetane biradical intermediatethat decays by different pathways depending on solvent polarity. In polar solvents (acetonitrile, water), thebiradical decays by releasing acetate or fluoride with a lifetime of about 2 ns. Thus, DMB is an excellentprotecting group for the investigation of fast processes such as protein folding.