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A convenient method for the preparation of [1-2H]- and [1-3H]-terminal acetylenes

✍ Scribed by S. A. Lermontov; S. E. Tkachenko; R. G. Gafurov

Book ID
112442601
Publisher
Springer
Year
1985
Tongue
English
Weight
172 KB
Volume
34
Category
Article
ISSN
1573-9171

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## Abstract The ureas **3** which are obtained from 3‐(benzylamino)propanenitrile (**1**) and various isocyanates (**2**) cyclize readily upon heating in ethanol, in the presence of hydrochloric acid, to form 3‐substituted 1‐benzyldihydro‐2,4‐(1__H__,3__H__)pyrimidinediones (**11**) in good yield.