- Synthesis and nonlinear optical absorption properties of two new conjugated ferrocene-bridge-pyridinium compounds
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Two electron donor-π-acceptor (D-π-A) chromospheres, with ferrocene as the electron donor and pyridinium as the electron acceptor, were synthesized. The nonlinear optical absorption (NOA) properties in the solution state were investigated by the Z-scan technique. Both compounds exhibited reverse saturable absorption (RSA) and optical limiting effect under nanosecond pulse irradiation.
- Yang, Fan,Xu, Xiu-Ling,Gong, Yong-Hua,Qiu, Wen-Wei,Sun, Zhen-Rong,Zhou, Jin-Wei,Audebert, Pierre,Tang, Jie
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p. 9188 - 9194
(2008/02/10)
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- Enzymatic desymmetrization of 2-amino-2-methyl-1,3-propanediol: Asymmetric synthesis of (S)-N-Boc-N,O-isopropylidene-α-methylserinal and (4R)-methyl-4-[2-(thiophen-2-yl)ethyl]oxazolidin-2-one
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We report herein, the novel enzymatic desymmetrization of 2-tert-butoxycarbonylamino-2-methyl-1,3-propanediol 1. This method makes it possible to prepare (S)-N-Boc-N,O-isopropylidene-α-methylserinal 3, which is a chiral building block for the synthesis of a variety of α-substituted alanine derivatives. Moreover, optically active (4R)-methyl-4-[2-(thiophen-2- yl)ethyl]oxazolidin-2-one 4, one of the key intermediates in the synthesis of a novel immunosuppressant, has been prepared by this methodology.
- Tsuji, Takashi,Iio, Yukiko,Takemoto, Toshiyasu,Nishi, Takahide
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p. 3139 - 3142
(2007/10/03)
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- A FACILE SYNTHESIS OF PERFLUORO- AND POLYFLUORO-ALKYL THIENYL ACETYLENES
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Perfluro- and polyfluoro-alkyl thienyl acetylenes were conveniently prepared by the following reaction sequence: Thienylmethylenetriphenylphoshorane (generated from the corresponding chloride and phenyllithium without isolation) was acylated by the additi
- Xin, Yuankang,Wu, Xiaohong,Shen, Yanchang
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