Removal, Recovery, and Recycling of Triarylphosphonium-Supported Tin Reagents for Various Organic Transformations
摘要:
Phosphonium-supported tin reagents and catalysts were prepared and were shown to be effective in Stille couplings, radical dehalogenations, radical cyclizations, and carbonyl allylations. Not only could the tin residues be removed from the crude reaction mixture through a phase separation process but also they could be recovered and recycled.
C−H Activation in Phosphonium Salts Promoted by Platinum(II) Complexes
作者:Larry R. Falvello、Susana Fernández、Carmen Larraz、Rosa Llusar、Rafael Navarro、Esteban P. Urriolabeitia
DOI:10.1021/om001034i
日期:2001.4.1
bis-phosphonium salts [R2PhPCH2]2C(O)}Cl2 (R2 = Ph2, PhEt, Et2) (1:1 molar ratio) in refluxing 2-methoxyethanol affords the C,C-orthometalated complexes [PtCl2(C6H4-2-PR2C(H)C(O)CH2PPhR2)] (R2 = Ph2 1a, PhEt 1b, Et2 1c). The reaction of PtCl2 with the bis-phosphonium salt [Ph3PCH2]2C(O)}Cl2 (1:1 molar ratio) gives [Ph3PCH2]2C(O)}[PtCl4], 2, while treatment of PtCl2 with the perchlorate salts [R2PhPCH2]2C(O)}(ClO4)2
作者:Chin, Chong Shik、Lee, Misun、Oh, Moonhyun、Won, Gyongshik、Kim, Mieock、Park, Young Ja
DOI:——
日期:——
US3997705A
申请人:——
公开号:US3997705A
公开(公告)日:1976-12-14
Removal, Recovery, and Recycling of Triarylphosphonium-Supported Tin Reagents for Various Organic Transformations
作者:Jean-Christophe Poupon、David Marcoux、Jean-Manuel Cloarec、André B. Charette
DOI:10.1021/ol701447q
日期:2007.8.1
Phosphonium-supported tin reagents and catalysts were prepared and were shown to be effective in Stille couplings, radical dehalogenations, radical cyclizations, and carbonyl allylations. Not only could the tin residues be removed from the crude reaction mixture through a phase separation process but also they could be recovered and recycled.
Halogenovinyl Sulfones. 6.<sup>1</sup> Synthesis of Condensed Heterocycles by Diastereoselective Intramolecular Diels−Alder Reactions of Sulfonyl-Substituted Trienes
Sulfonyl trienes having a chiral center on the allyl carbon of the diene moiety were prepared from L-amino acid as chiral building blocks. Intramolecular Diels-Alderreaction of the sulfonyl trienes having E-geometry on the diene moiety proceeded on the si-face and exo-selectively to give cis-isoindoles as a sole product in good yields. But using the sulfonyl trienes having Z-geometry on the diene