期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 73, 期 15, 页码 5890-5898出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo800801q
关键词
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A short, high-yielding route to omega-dithiafulvenylpolyenals (1) via the corresponding iminium salts (2) and starting from trimethyl-1,3-dithiolium tetrafluoroborate is reported. The Knoevenagel reactions of either I or 2 with isoxazolone-containing acceptors afford merocyanines 7 and 9, in a process that is often accompanied by a vinylene-shortening side reaction. Experimental and theoretical studies reveal that compounds 7 and 9, featuring two proaromatic end groups, are strongly polarized and show good second-order nonlinear optical responses.
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