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A Convenient Method for the Preparation of 6,7-Methyl-Enedioxy-3-Alkyl-2-Hydroxy-1,4-Naphthoquinones from Natural Safrole and Carboxylic Acids

✍ Scribed by Costa, P. R.R.; Lopes, C. C.; Pinto, A. V.


Book ID
126519109
Publisher
Taylor and Francis Group
Year
1983
Tongue
English
Weight
245 KB
Volume
13
Category
Article
ISSN
0039-7911

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Convenient method for the preparation of
✍ Atsushi Ogawa; Kazunari Sakagami; Akiko Shima; Hitoshi Suzuki; Satsuki Komiya; Y πŸ“‚ Article πŸ“… 2002 πŸ› Elsevier Science 🌐 French βš– 75 KB

Hydroxy-1-phenylthio-2-alkynes (5) reacted with dihydropyran to afford the corresponding 4-tetrahydropyranyloxy derivatives which, on treatment with KHMDS, gave a mixture of (E)-and (Z)-1-phenylthio-3-alken-1-ynes, with the former predominant. When MeLi was used in the place of KHMDS, the (Z)-isomer