Solubility of Helium in Lithium Silicate Melts

✍ Scribed by Priv.-Doz. Dr. H. Scholze; Dipl.-Chem. H.-O. Mulfinger

• Publisher: John Wiley and Sons
• Year: 1962
• Tongue: English
• Weight: 126 KB
• Volume: 1
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.196200521

✦ Synopsis

V [4] (Hg salt: m.p. 128 to 129 "C.) with n-butyllithium [3]. Thus, it is easier to remove a bromine cation from compound 11 than a proton [5]: GHsLi I1 ---+ (%H&P=CHz + (CnHs)P=CHBr

The desired bromomethylenation can be realized with lithium piperidide 161 which predominantly removes protons from 11; subsequent reaction with p-ionone (VI) gives, after chromatographic purification, the very unstable compound VII in 70 % yield (Amax = 269 mp; log E = 4.18). I thank Prof. G. Wiffig for his assistance in this work.