Abstract
Even 10-membered rings can be obtained by ring-closing metathesis (RCM). The synthesis of carbocycle B by RCM, which is the key step in the synthesis of the pine-resin sesquiterpene 1,6-germacradien-5-ol, was improved by protecting the hydroxy group of the precursor bisolefin A as a bulky tert-butyldimethylsilyl ether and by complexing its carbonyl group with Ti(OiPr)4 .
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