- CONJUGATED DIENE PRODUCTION METHOD
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PROBLEM TO BE SOLVED: To provide a novel conjugated diene production method. SOLUTION: A method of producing a conjugated diene represented by the specified general formula (2) is characterized by reacting 1-acyloxy-1,3-alkadiene represented by the specified general formula (1) with a Grignard reagent represented by R6-Mg-X in the presence of an iron catalyst. SELECTED DRAWING: None COPYRIGHT: (C)2018,JPO&INPIT
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Paragraph 0039; 0040; 0041
(2018/09/30)
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- The fate of bis(η3-allyl)palladium complexes in the presence of aldehydes (or imines) and allylic chlorides: Stille coupling versus allylation of aldehydes (or imines)
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The mere presence or absence of PPh3 suffices to control the reactivity of bis(η3-allyl)palladium complexes. In the absence of PPh3 they undergo chemoselective allylic addition to aldehydes or imines, even in the presence of allylic chlorides, whereas in the presence of PPh3 the Stille coupling reaction takes place chemoselectively, even when aldehydes or imines are also present (see scheme).
- Nakamura, Hiroyuki,Bao, Ming,Yamamoto, Yoshinori
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p. 3208 - 3210
(2007/10/03)
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- A simplified Wittig synthesis using a solid/liquid transfer process. IX. Selectivity of the condensation reaction of moderated ylides with aldehydes
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Conjugated dienes are obtained selectively and with high yields using aldehydes of various structures. The synthesis is made in a two-phase medium, i.e. solid/liquid medium.
- Ben Attra,Le Bigot,El Gharbi,Delmas,Gaset
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p. 1421 - 1425
(2007/10/02)
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- New and Highly (E)-Selective Synthesis of Terminal 1,3-Diene via Three-Carbon Elongation of Aldehyde
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A new synthetic method of 1,3-diene by three-carbon elongation of aldehyde is described. 3-Trimethylsilyl-1-propenylzirconocene chloride (2), generated from 3-trimethylsilyl-1-propyne (1) and Cp2Zr(H)Cl, reacts with aldehyde in the presence of catalytic AgClO4 and subsequent one-pot 1,4-elimination affords 1,3-dienes in high yields with excellent (E)-selectivities.
- Maeta, Hideki,Suzuki, Keisuke
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p. 5969 - 5972
(2007/10/02)
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