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Copyright of Zeitschrift für Naturforschung B: A Journal of Chemical Sciences is the property of De Gruyter and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Orthoamides of alkynecarboxylic acid 15 condense with enolisable β-dicarbonyl compounds and as well with acetophenones to give 3-acryl-1,1-bis(dimethyl-amino)-1,3-butadienes. Some acylbutadienes cyclize affording 2-pyranon-derivatives 33 upon heating with aqueous ethanol. 2H-pyranes are accessible from acetone dicarboxylic acid ester and orthoamides 15. The constitution of one 4-acyl-1,1-bis(dimethylamino)-1,3-butadiene (16f) and one 2H-pyrane (44b) was confirmed by crystal structure determinations. [ABSTRACT FROM AUTHOR]

Copyright of Zeitschrift für Naturforschung B: A Journal of Chemical Sciences is the property of De Gruyter and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)