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Diboranyl Phosphonium Cations: Synthesis and Chemical Properties
Author(s) -
Litters Sebastian,
Ganschow Michael,
Kaifer Elisabeth,
Himmel HansJörg
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201500861
Subject(s) - chemistry , phosphonium , phosphine , diborane , medicinal chemistry , carbene , hydride , base (topology) , decomposition , stereochemistry , polymer chemistry , organic chemistry , hydrogen , boron , catalysis , mathematical analysis , mathematics
Hydride abstraction from the diborane [HB(hpp)] 2 (hpp = 1,3,4,6,7,8‐hexahydro‐2 H ‐pyrimido[1,2‐ a ]pyrimidinate) followed by base stabilization led to the first (highly water sensitive) diboranyl phosphonium cations of the general formulas [HB(hpp) 2 BPR 3 ] + and [HB(hpp) 2 BPHR 2 ] + . The B–P bond strength could be varied over a relatively large range by choice of the substituents R on the phosphine. The cation [HB(hpp) 2 BPCy 3 ] + (Cy = cyclohexyl) was structurally characterized. The PCy 3 base of this cation could be substituted by a stronger base (a carbene or a bicyclic guanidine). In solution, [HB(hpp) 2 BPCy 3 ] + very slowly decomposes, and [HB(hpp) 3 BH] + was identified as one of the decomposition products.