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Phosphane – Tetrahalodiborane(4) Adducts: Formation of closo ‐3,4,5,6‐Tetrabromo‐1,2‐diphosphahexaborane(4)
Author(s) -
Keller Willi,
Sneddon Larry G.,
Einholz Wolfgang,
Gemmler Armin
Publication year - 1992
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19921251102
Subject(s) - chemistry , diborane , adduct , trimethylsilyl , medicinal chemistry , boron , yield (engineering) , stereochemistry , boro , tris , organic chemistry , biochemistry , materials science , metallurgy
Tetrabromodiborane(4), B 2 Br 4 , forms a 1:2 adduct 1 with PBr 3 , which reacts at 350°C to closo ‐1,2‐P 2 B 4 Br 4 ( 4a ) in 25% yield. Compound 4a neither rearranges to the 1,6‐isomer nor decomposes to an appreciable extent upon heating to 650°C. B 2 C 14 reacts with equimolar amounts of either tris(trimethylsilyl)‐phosphane or 1,2‐bis(dichlorophosphanyl)ethane to give B 2 Cl 4 · P(SiMe 3 ) 3 ( 2 ) and B 2 Cl 4 · Cl 2 PCH 2 CH 2 PCl 2 ( 3 ), respectively. Compound 2 represents the first phosphane – diborane(4) monoadduct with two boron atoms in different coordination environment.