911125-25-2Relevant articles and documents
3-Cyclopropyl- and 3-tert-butyl-substituted propyne iminium salts as dienophiles in Diels-Alder reactions
Gerster, Holger,Espenlaub, Sigrid,Maas, Gerhard
, p. 2251 - 2259 (2008/02/02)
Starting from cyclopropylacetylene and 3,3-dimethyl-but-1-yne, and an imidoyl chloride 5, the alkynyl imines 6 were prepared and then converted into propyne iminium triflates 7 by N-methylation. These electron-deficient acetylenes were found to be reactiv