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Kupfer …… wird für die Legierung der japanischen 10‐Yen‐Münze, auf der der Byodo‐in‐Tempel zu sehen ist, verwendet und ist ein effizienter Katalysator der Boraformylierungen und Silaformylierungen von Allenen mit Formiatestern, die T. Fujihara, Y. Tsuji et al. in der Zuschrift auf S. 1561 ff. beschreiben. In Gegenwart von B2(pin)2 oder PhMe2SiB(pin) führen diese Reaktionen selektiv zu den entsprechenden...
The boraformylation of allenes with B2(pin)2 and a formate ester as boron and formyl source, respectively, proceeds in the presence of a copper catalyst. The reaction selectively affords the corresponding β‐boryl β,γ‐unsaturated aldehydes in good to high yields. Furthermore, the silaformylation of allenes was achieved with a formate ester and PhMe2Si−B(pin) as the silicon source.
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