Phosphinalkylene, 51¹; Synthese und Reaktionen von [1-(Trialkylsilyl)alkyliden]triphenylphosphoranen

From Ylides to Doubly Yldiide-Bridged Iron(II) High Spin Dimers via Self-Protolysis

“…All glassware was oven-dried at 120 °C prior to use. [Fe(N(SiMe 3 ) 2 ) 2 ], 32 [Fe(Mes) 2 ] 2 , 13 Ph 3 PCH 2 ( 1a ), 33 Ph 3 PCH(SiMe 3 ) ( 1b ), 33 and 1,3- iso -propyl-2-methylenebenzimidazol (ImCH 2 , 1c ) 34 were prepared according to a literature procedure. NMR spectra were measured on a Bruker AVANCE III HDX, 500 MHz Ascend ( 1 H (500.05 MHz), 13 C (125.75 MHz), 31 P (202.42 MHz), 19 F (470.52 MHz), 29 Si (99.34 MHz)).…”

A Novel Synthesis of 4H-Chromen-4-ones via Intramolecular Wittig Reaction

“…1 As part of our ongoing program for developing methodologies using phosphacumulene 2 and their subsequent application to biologically useful compounds, the (trimethylsilyl)methylenetriphenylphosphorane is envisaged as a versatile reagent offering considerable opportunities for synthetic manipulations. 3 In general, chromones are synthesized by the cyclodehydration of 1-(o-hydroxyaryl)-1,3diketone or equivalent intermediates catalyzed by strong acids or strong bases. 4 They have been also prepared on a large scale by the Allan-Robinson synthesis involving acylation, rearrangement, and subsequent cyclization.…”

Catalysis of Intramolecular Morita–Baylis–Hillman and Rauhut–Currier Reactions by Fluorous Phosphines; Facile Recovery by Liquid/Solid Organic/Fluorous Biphase Protocols Involving Precipitation, Teflon® Tape, and Gore‐Rastex® Fiber

“…The known ylides Ph 3 PCHA C H T U N G T R E N N U N G (C=O)Ph [28] and Ph 3 PCHA C H T U N G T R E N N U N G (C= O)-p-tol [29] were prepared by an alternative procedure. [30] The new ylide Ph 3 PCHA C H T U N G T R E N N U N G (C=O)S-i-Pr was synthesized analogously to the SEt homolog.…”