Acetolysis of (3,5,5-trimethyl-1-pyrazolin-3-yl)methyl p-bromobenzenesulfonate. Elimination of nitrogen from an azo compound via cationic intermediates
作者:Evan L. Allred、Charles R. Flynn
DOI:10.1021/ja00836a024
日期:1975.2
On the Regioselectivity of the Intramolecular [2 + 2]-Photocycloaddition of Alk-3-enyl Tetronates
作者:Roland Weixler、Jörg P. Hehn、Thorsten Bach
DOI:10.1021/jo201066d
日期:2011.8.5
The simple diastereoselectivity and the regioselectivity of the [2 + 2]-photocycloaddition of alk-3-enyl tetronates were studied, depending on the nature of the substituent R in the α-position. Fourteen tetronates were synthesized and their intramolecular photocycloaddition reactions performed. If R was an alkoxycarbonyl group and if the olefin, which underwent the intramolecular addition, was sterically