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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. îÜ´ß»¯µÄȲ±û»ùì¢ÑλòȲ¹¦ÄÜ»¯µÄì¢ÑÎÓë1,3-¶þÏ©½øÐÐDiels¨CAlder·´Ó¦Éú³ÉÇ⻯·¼×åÑÎÖмä²úÎÕâЩÖмä²úÎï¿ÉÖ±½ÓºÍÒÒÈ©½øÐÐWittigÏ©»¯·´Ó¦¡£ËæºóµÄÑõ»¯Í¨¹ýÐγÉÈýÖÖеÄ̼̼¼üµÃµ½±½ÒÒÏ©ºÍ¾ù¶þ±½´úÒÒÏ©Àà²úÎï¡£¸Ã·´Ó¦µÄ²úÎï¾ø´ó¶àÊýÊÇEÐÍ£¨Ê½£©µÄ¡£ |
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