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New Reagents for Synthesis of Heterocyclics from Carbodiimides and Phosgeniminium Salts

✍ Scribed by Dr. Asher Elgavi; Prof. Dr. Heinz Günter Viehe


Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
193 KB
Volume
16
Category
Article
ISSN
0044-8249

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Two consecutive [3+2] cycloaddition reactions of the diphosphanylketenimine (PPh(2))(2)C[double bond]C[double bond]NPh (3), involving the phosphanyl groups, with two equivalents of the electron-poor alkynes dimethyl acetylenedicarboxylate or methyl acetylenecarboxylate give rise to the formation of