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It was shown that the cobalt(I)-catalyzed Diels¨CAlder reaction of propargylic phosphonium salts and alkyne-functionalized phosphonium salts with 1,3-dienes led to dihydroaromatic phosphonium salt intermediates that were directly used in a one-pot Wittig-type olefination reaction with aldehydes. Subsequent oxidation led to styrene- and stilbene-type products with the formation of three new carbon¨Ccarbon bonds. The reaction gives predominantly the E-configured products.
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It was shown that the cobalt(I)-catalyzed Diels¨CAlder reaction of propargylic phosphonium salts and alkyne-functionalized phosphonium salts with 1,3-dienes led to dihydroaromatic phosphonium salt intermediates that were directly used in a one-pot Wittig-type olefination reaction with aldehydes. Subsequent oxidation led to styrene- and stilbene-type products with the formation of three new carbon¨Ccarbon bonds. The reaction gives predominantly the E-configured products.

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