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Effect of Cl–Br Exchange on 2 J PP and δ 31 P in Bis(dihalophosphanyl) Ylides
Author(s) -
Schrödel HansPeter,
Schmidpeter Alfred
Publication year - 1996
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199603)34:3<227::aid-omr875>3.0.co;2-5
Subject(s) - chemistry , halogen , ylide , coupling constant , carbon atom , medicinal chemistry , competition (biology) , atom (system on chip) , carbon fibers , electron exchange , computational chemistry , organic chemistry , ion , ecology , alkyl , physics , materials science , particle physics , composite number , computer science , composite material , biology , embedded system
Tetrachloro‐ and tetrabromodiphosphanyltriphenylphosphonium ylides give an equilibrium mixture of all possible halogen‐exchange products. Their strongly varying coupling constants J (Ph 3 P–C–P) are explained as resulting from varying shares of two conformations. The chemical shifts δ 31 P of the phosphanyl groups seem to reflect their competition for the electron transfer from the ylide carbon atom. Related examples are included for comparison.