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Hidden Brønsted acid catalysis: pathways of accidental or deliberate generation of triflic acid from metal triflates.
The generation of a hidden Brønsted acid as a true catalytic species in hydroalkoxylation reactions from metal precatalysts has been clarified in case studies. The mechanism of triflic acidExpand
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Mixed phosphane η5-CpRuCl(PR3)2 complexes as ambifunctional catalysts for anti-Markovnikov hydration of terminal alkynes.
The catalytic activity of [CpRu(L)(2)(MeCN)]PF(6) (L = 2-diphenylphosphinopyridine with bulky groups at C-6) for anti-Markovnikov hydration of terminal alkynes to aldehydes is retained when oneExpand
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Inner workings of a cinchona alkaloid catalyzed oxa-Michael cyclization: evidence for a concerted hydrogen-bond-network mechanism.
Cinchona alkaloids catalyze the oxa-Michael cyclization of 4-(2-hydroxyphenyl)-2-butenoates to benzo-2,3-dihydrofuran-2-yl acetates and related substrates in up to 99% yield and 91% ee (ee =Expand
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Asymmetric hydroalkoxylation of non-activated alkenes: titanium-catalyzed cycloisomerization of allylphenols at high temperatures.
The asymmetric catalytic addition of alcohols (phenols) to non-activated alkenes has been realized through the cycloisomerization of 2-allylphenols to 2-methyl-2,3-dihydrobenzofuransExpand
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Cyclization of ortho-hydroxycinnamates to coumarins under mild conditions: A nucleophilic organocatalysis approach
Summary (E)-Alkyl ortho-hydroxycinnamates cyclize to coumarins at elevated temperatures of 140–250 °C. We find that the use of tri-n-butylphosphane (20 mol %) as a nucleophilic organocatalyst in MeOHExpand
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Asymmetric total synthesis of smyrindiol employing an organocatalytic aldol key step
Summary The first organocatalytic asymmetric synthesis of smyrindiol, by using an (S)-proline catalyzed enantioselective intramolecular aldol reaction as the key step, is described. Smyrindiol wasExpand
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Mixed Phosphane η5‐CpRuCl(PR3)2 Complexes as Ambifunctional Catalysts for anti‐Markovnikov Hydration of Terminal Alkynes.
A new in situ mixed phosphane catalyst, is mixed in situ, used for preparative anti-Markovnikov hydration of alkynes in water-rich media.
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Asymmetric Hydroalkoxylation of Non‐activated Alkenes: Titanium‐Catalyzed Cycloisomerization of Allylphenols at High Temperatures.
A microwave-assisted enantioselective intramolecular hydroxyalkylation of 2-allylphenols at high temperatures yields 2-methylcoumarans.