Oligometallic template strategy for ring-closing olefin metathesis: highly cis- and trans-selective synthesis of a 32-membered macrocyclic tetraoxime.
An oligometallic template effect was observed on the cis/trans selectivity of a 32-membered macrocyclic tetraoxime in ring-closing olefin metathesis of an acyclic diallyl derivative H4L; the metathesis of heterotrinuclear complex LZn2M (M=Ca2+, La3+) afforded the cis isomer, whereas uncomplexed H4L gave the trans isomer.
Akine
Shigehisa
S
Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan.
Kagiyama
Satoko
S
Nabeshima
Tatsuya
T