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AbstractAtrolactic syntheses have been carried out to evaluate the potentiality, in asymmetric syntheses, of chiral inducers. The (dl)‐hydroxyhelicenes 1, 2, the (dl) sec. alcohols 3–12 and the (dl) phenolic binaphtyl compound 15 have been used as inducers. The d.e. are collected in table I (6–100%). The atrolactic asymmetric synthesis has also been carried out using three optically active inducers, namely: (‐)‐quinine 13, (‐)‐10, 11‐dihydroquinine 14, and R(‐)‐2, 2, 2‐trifluoro‐1‐(9‐anthryl) ethanol 6. Diastereomeric and enantiomeric excesses equal or greater than 88% have been obtained in six cases out of sixteen: (dl)‐2‐hydroxyheptahelicene 1 (d.e=100%±2), (1‐naphtyl)‐(9‐anthryl) methanol 3 (d.e=90%); 2, 2, 2‐trichloro‐1‐(9‐anthryl) ethanol 7 (d.e=100%±2), 2, 2, 2‐tribromo‐1‐(9‐anthryl) ethanol 8 (d.e=100%±2), (‐)‐quinine 13 (e.e=95.5%), and (‐)‐2, 2, 2‐trifluoro‐1‐(9‐anthryl) ethanol 6 (e.e=88%).
Chimie
Chimie
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 47 | |
popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Top 10% | |
influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Average |