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On function-degenerate immersions of a Lobachevsky plane into E4

โœ Scribed by Yu. A. Aminov


Publisher
Springer US
Year
1991
Tongue
English
Weight
642 KB
Volume
53
Category
Article
ISSN
1573-8795

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## Abstract A simple oneโ€step synthesis of 2โ€aminoโ€4โ€arylโ€5โ€oxoโ€4__H__โ€furo[3,4โ€__b__]pyranโ€3โ€carbonitriles 7 is described. It involves reaction of 2,4(3__H__,5__H__)โ€furandione (ฮฒโ€tetronic acid) (5) with arylmethylenemalononitriles 4 in basic medium. Some substituent effects are noted and the assi