3,4-dimethyl-2,5-bis(trimethylsilyl)phospha- and 3,4-dimethyl-2,5-bis(trimethylsilyl)arsacyclopentadienides of calcium

Citation
M. Westerhausen et al., 3,4-dimethyl-2,5-bis(trimethylsilyl)phospha- and 3,4-dimethyl-2,5-bis(trimethylsilyl)arsacyclopentadienides of calcium, ORGANOMETAL, 18(13), 1999, pp. 2491-2496
Citations number
50
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
ORGANOMETALLICS
ISSN journal
02767333 → ACNP
Volume
18
Issue
13
Year of publication
1999
Pages
2491 - 2496
Database
ISI
SICI code
0276-7333(19990621)18:13<2491:3A3>2.0.ZU;2-8
Abstract
The reaction of zirconocene dichloride with 2 equiv of butyllithium and 1-t rimethylsilylpropyne yields yellow 1,1-bis(cyclopentadienyl)-3,4-dimethyl-2 ,5-bis(trimethylsilyl)zirconacyclopenta-2,4-diene, 1. The metathesis reacti on of 1 with PCl3 gives a mixture of 1-chloro- and 1-cyclopentadienyl-3,4-d imethyl-2,5-bis( which was allowed to react in THF with distilled calcium. Crystallization of the product from THF solution gave dimeric bis(tetrahydr ofuran-O)dicalcium bis[3,4-dimethyl-2,5-bis(trimethylsilyl)-1-phosphacyclop enta-2,4- cyclopentadienide chloride, 2. The metathesis reaction of 1 with AsCl3 yielded nearly quantitatively 1-chloro-3,4-dimethyl-2,5-bis(trimethyl silyl)-1-arsacyclopenta-2,4-diene, 3. 3,4-Dimethyl-2,5-bis(trimethylsilyl)- 1-arsacyclopentadienyl bis(tetrahydrofuran-O)calcium chloride, 4, was isola ted from the reduction of 3 with distilled calcium.