Experimental evidence of a cyclopropylcarbinyl conjugative electronic effect
作者:Phyllis A. Leber、Anthony J. Nocket、Matthew F. Wipperman、Sylvia Zohrabian、Christopher Y. Bemis、Munsha K. Sidhu
DOI:10.1039/c3ob41365a
日期:——
Bicyclo[3.2.0]hept-2-enes undergo thermalrearrangement to norbornenes via diradical transition structures. The synthesis of exo-7-cyclopropylbicyclo[3.2.0]hept-2-ene has been achieved by cycloaddition of cyclopentadiene and cyclopropylketene, generated by treatment of cyclopropylacetyl chloride with triethylamine. A comparison of the cyclopropyl substituent effect with that of other C7 substituents