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Based on the theory of sustainable development, evaluation indexes system of public libraries has been established. Principal component analysis was applied in the empirical study of public libraries in Chongqing in recent years. Three principal components have been chosen, and the comprehensive evaluation model was established. It is concluded that the development level of public libraries in Chongqing...
A novel tandem cross-Rauhut–Currier/cyclization reaction between α,β-unsaturated ketones was developed. Using DABCO (20mol%) as the catalyst, a series of densely functionalized 3,4-dihydropyrans were obtained in excellent yields and stereoselectivities (up to 98% yield, >99:1 dr). A tentative catalytic cycle was proposed with key intermediates confirmed by ESIMS studies.
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