試題詳解

68. The HOMO of (2E,4Z,6E)-octatriene undergo thermal cyclization using which process and which product? (HOMO orbital of pi-electrons of octatriene is given below, not showing the stereochemistry) 
(A) disrotatory and cis-product
(B) conrotatory and cis-product
(C) disrotatory and trans-product
(D) conrotatory and trans-product
(E) both disrotatory and conrotatory to give trans and cis product respectively