Can I read endo ‐cyclobutane ring strain in the cyclic isomers of 7‐coumarinyl diesters rooc(CH~2~)~n~COOR on EtoBox?

endo ‐cyclobutane ring strain in the cyclic isomers of 7‐coumarinyl diesters rooc(CH~2~)~n~COOR by F. Compernolle; F. C. De Schryver is a Chemistry article available to read on EtoBox.

What is endo ‐cyclobutane ring strain in the cyclic isomers of 7‐coumarinyl diesters rooc(CH~2~)~n~COOR about?

## Abstract Upon electron impact the open form diesters ROOC(CH~2~)~n~COOR where R = 7‐coumarinyl and 4‐methyl‐7‐coumarinyl and their cyclic isomers obtained by photolysis react via common fragmentation pathways. The cyclic isomers derived from 7‐coumarinyl by photolysis resist heating to 250^o^C, but a thermal ring opening was observed for the more crowded cyclic isomers derived from 4‐methyl‐7‐coumarinyl. Differences in the appearance potentials for the ions [M  OR]^+^ produced from 7‐coumarinyl and its photocyclization isomers can be attributed to their different ground state enthalpies. The strain in the endo‐cyclobutane ring of the photocyclization isomers derived from 7‐coumarinyl (ring strain and strain due to nonbonded interactions) amounts to 38 ± 1 kcal mol^−1^.

Who reads endo ‐cyclobutane ring strain in the cyclic isomers of 7‐coumarinyl diesters rooc(CH~2~)~n~COOR?

Author

F. Compernolle; F. C. De Schryver

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley-Blackwell; Wiley-Liss Inc; John Wiley & Sons Inc.; Wiley; Heyden And Son (ISSN 1076-5174)

Published

1976

Language

EN

Field

Chemistry (Physical Sciences)