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(–)-(M,7S)-Colchicine and (–)-(M,7S)-10-Ethylthiocolchicide/Alkyne Cycloaddition Reactions: Synthesis of Novel Colchicine Derivatives by Consecutive [4+2] and [3+2] Cycloadditions

✍ Scribed by René Brecht; Frank Haenel; Gunther Seitz; Gerlinde Frenzen; Astrid Pilz; Daniel Guénard


Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
492 KB
Volume
1998
Category
Article
ISSN
1434-193X

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Synthesis and Structure of [Sn4Se11]6–,
✍ Anja Loose; William S. Sheldrick 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 German ⚖ 205 KB 👁 1 views

Reaction of A 2 CO 3 (A = K, Rb) with Sn and Se in an H 2 O/CH 3 OH mixture at 115±130 °C affords the isotypic selenidostannates(IV) A 6 Sn 4 Se 11 ´x H 2 O (A = K, x = 8) 1 and 2 whose discrete [Sn 4 Se 11 ] 6± anions each contain two corner-bridged ditetrahedral [Sn 2 Se 6 ] 4± species. Similar re