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A Novel Pattern of Dimerization for 1,4-Diphospha-1,3-butadienes.

✍ Scribed by Alex S. Ionkin; William J. Marshall

Publisher: John Wiley and Sons
Year: 2003
Weight: 75 KB
Volume: 34
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.200331199

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## Abstract A new example of [2+4] cycloaddition of the low‐coordinated diphospha‐analog of butadiene protected with a 2,4‐di‐__tert__‐butyl‐6‐methylphenyl group has been described. X‐ray structure investigations of monomer **__4b__** and dimer **__5a__** have been reported for the first time. © 20

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The reactions of 2,3-dichloro-1,4-diphospha-1,3-butadiene, which is sterically protected with the 2,4,6-tri-t-butylphenyl group, with some nucleophiles, including alkyllithium reagents and lithium aluminum hydrides, afforded 1,2-diphosphinoacetylenes or 3-phosphino-1-phosphaallenes.

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## Abstract Novel complexes [(C~5~Me~5~)~2~Ln][B(C~6~F~5~)~4~] (Ln = Pr, Nd, or Gd) were prepared, which in combination with ^__i__^Bu~3~Al efficiently induce highly 1,4‐cis‐specific polymerization of butadiene. The activity of the Gd complex/^__i__^Bu~3~Al system is high enough to exhibit good cat