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Synthesis and some properties of vinylogs of 4,4′-dicarbalkoxy-, 4,4′-digyano-, and 4,4′-diaroylbenzenes

✍ Scribed by G. V. Grinev; V. A. Dombrovskii; L. A. Yanovskaya

Book ID
112423901
Publisher
Springer
Year
1972
Tongue
English
Weight
191 KB
Volume
21
Category
Article
ISSN
1573-9171

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## Abstract (−)‐(__R__)‐4,4,4,4′,4′,4′‐Hexafluorovaline hydrochloride ((__R__)‐5) of 98% ee is prepared from β,β‐bis(trifluoromethyl)acrylic acid (= benzyl 4,4,4‐trifluoro‐3‐(trifluoromethyl)but‐2‐enoate; 1) in 4 steps with an overall yield of 9.6%. Key step is the separation of the TsOH salts of t