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Synthesen, Struktur und Eigenschaften von 1,2,5‐Phosphadiborolanen
Author(s) -
Frankhauser Pascal,
Drieß Matthias,
Pritzkow Hans,
Siebert Walter
Publication year - 1994
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.19941270208
Subject(s) - chemistry , nuclear magnetic resonance spectroscopy , yield (engineering) , molecule , stereochemistry , medicinal chemistry , crystallography , organic chemistry , materials science , metallurgy
Syntheses, Structure and Properties of 1,2,5‐Phosphadiborolanes Reactions of ( Z )‐1,2‐bis[chloro(diisopropylamino)boryl]ethane with Li 2 PC 6 H 5 and of 1,2‐bis[chloro(diisopropylamino)boryl]‐1,2‐diisopropylideneethane with [LiPh 2 ·dme] yield the 1,2,5‐phosphadiborolanes 1 and 2 , respectively. The compounds are characterized by 1 H‐, 11 B‐, 13 C‐, and 31 P‐NMR spectroscopy as well as an X‐ray structure analysis of 2 . Low‐temperature 1 H‐NMR studies show that the inversion barrier at P is distinctly lower than that of related unsaturated compounds. This might be the result of a favorable BP‐π interaction in the transition state of the inversion at the phosphorus atom. Reaction of 1 with S 8 or CS 2 leads to the 1,2,5‐thiadiborolane 3 .