H. Mayr, R. Huisgen
1975
Citations
0
Influential Citations
2
Citations
Journal
Tetrahedron Letters
Abstract
It was noticed in the nmr spectm (CDC13, 68 MHz) of the cyclobutanones with R’ = R2 that the 3-H absorbs at higher field in the cycloadducts of tmns-l+lkenyl ethers (R30 and R4 tmns) (l-3). The genemlization is permissible that ring protons are more strongly shielded by cis-victhan by tmns-vic-alkyl. On the other hand, cis-vicand tmns-vic-phenyl appear to be equally effective in deshielding cyclobutanone ring