- SEMICONDUCTING COMPOSITIONS COMPRISING SEMICONDUCTING POLYMERS
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A semiconducting composition comprising a semiconducting polymer and a semiconducting non-polymeric polycyclic compound, wherein the semiconducting polymer comprises units of A and/or B: wherein R1, R2, R5, R6, R7, R8, x, y, p, q, r, R3, R4, R9, R10 and R11 have any of the meanings defined in the description.
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Paragraph 0583-0585
(2019/05/15)
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- Catalytic asymmetric synthesis of a tertiary benzylic carbon center via phenol-directed alkene hydrogenation
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An expeditious synthetic approach to chiral phenol 1, a key building block in the preparation of a series of drug candidates, is reported. The strategy includes a cost-effective and readily scalable route to cyclopentanone 3 from isobutyronitrile (10). The sterically hindered and enolizable ketone 3 was subsequently employed in a challenging Grignard addition mediated by LaCl 3?2LiCl. A novel preparation of the lanthanide reagent required for this transformation is described. To complete the process, a highly enantioselective hydrogenation step afforded the target (1). The importance of the phenol group to the success of this asymmetric transformation is discussed.
- Caille, Seb,Crockett, Rich,Ranganathan, Krishnakumar,Wang, Xiang,Woo, Jacqueline C. S.,Walker, Shawn D.
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experimental part
p. 5198 - 5206
(2011/08/09)
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