Two diastereoisomers of 1-(10-trifluoromethyl-11,12-dioxatetracyclo[6.2.1.13,6.02,7]dodeca-4,9-dien-9-yl)ethyl phenylacetate, C21H19F3O4: members of a series of adducts generated by repeated Diels–Alder cycloaddition of furan to 5,5,5-trifluoropent-3-yn-2-yl phenylacetate
作者:M. G. Barlow、R. G. Pritchard、S. Tajammal、A. E. Tipping
DOI:10.1107/s0108270193007668
日期:1993.12.15
Both the tide bis adducts are anti joined, differing only in the enantiomeric form of the (phenylacetoxy)ethyl substituent relative to the main ring system. hi each case, a CF3 fluorine nearly eclipses the double bond [F-C-C=C; isomer (1), 5.9 (7); isomer (2), 10 (2)-degrees], thereby permitting the adjacent substituent to stagger and the bulky phenylacetoxy group to project away [C=C-C-O; isomer (1), -161.6 (4); isomer (2), 157 (1)-degrees]. Changes in steric congestion introduced by the structural differences are relatively minor, allowing similar quantities of both compounds to be produced [isomer (1), 10; isomer (2), 8%].