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硅橡胶粘接用双酰胺基硅烷偶联剂的合成研究 被引量:4
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作者 胡乃昌 《化学工程师》 CAS 2010年第3期55-57,共3页
在硅橡胶中掺混入双酰胺基硅烷偶联剂后,既提高了粘接强度,又不对硅橡胶本身起增稠作用,保证涂覆工艺的可操作性。我们经过对硅烷偶联剂的广泛研究以及性质的深入分析,通过多次粘接试验,设计及合成出双酰氨基硅烷偶联剂的分子,满足了硅... 在硅橡胶中掺混入双酰胺基硅烷偶联剂后,既提高了粘接强度,又不对硅橡胶本身起增稠作用,保证涂覆工艺的可操作性。我们经过对硅烷偶联剂的广泛研究以及性质的深入分析,通过多次粘接试验,设计及合成出双酰氨基硅烷偶联剂的分子,满足了硅橡胶粘接的要求。 展开更多
关键词 硅橡胶 掺混 双酰胺基硅烷
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A novel and versatile method for the enantioselective syntheses of tropane alkaloids 被引量:3
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作者 MAO ZhongYi HUANG SuYu +2 位作者 GAO LongHui WANG AiE HUANG PeiQiang 《Science China Chemistry》 SCIE EI CAS 2014年第2期252-264,共13页
A full account of the novel and flexible approach to hydroxylated 8-azabicyclo[3,2,1]octan-3-ones and 9-azabicyclo[3,3,1] nonan-3-ones is presented. Using keto-lactams as the starting materials, this two-step method c... A full account of the novel and flexible approach to hydroxylated 8-azabicyclo[3,2,1]octan-3-ones and 9-azabicyclo[3,3,1] nonan-3-ones is presented. Using keto-lactams as the starting materials, this two-step method consists of silyl enol ether for mation with TBDMSOTf, lactam activation with Tf20/DTBMP, and halide-promoted cyclization. Radical dechlorination of the resulting 1-halotropan-3-ones led to the corresponding hydroxylated tropan-3-ones, which can be hydrogenated to yield 3ct,613-dihydroxytropanes. Starting from optically active keto-lactams, the method has been applied to the enantioselective syntheses of (+)-(1S,3S,5R,6S)-pervilleine C (6), (+)-(1S,3R,5S,6R)-valeroidine (3), (+)-(1S,3S,5R,6S)-dibenzoyloxytropane (8) and (+)-(1S,3S,5R,6S)-merredissine (9). 展开更多
关键词 synthetic methods tropane alkaloids CYCLIZATION ACTIVATION AMIDES
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