The double base impact in the dehydrochlorination of 1,2-bis[bis(trimethylsilyl)methylchlorophosphino]ethane

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

• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 82 KB
• Volume: 14
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/hc.10122

✦ Synopsis

Abstract

1,2‐Bis[bis(trimethylsilyl)methylchlorophosphino]ethane was prepared by the reaction of 1,2‐bis(dichlorophosphino)ethane and the Grignard reagent of bis(trimethylsilyl)chloromethane. It adds DBN (1,5‐diazabicyclo[4.3.0]non‐5‐ene) in a 1:2 ratio. Subsequent treatment with t‐BuLi converts the adduct to a condensation product, which in its enamine form reacts with MgCl~2~ (still present from the preparation of 1) to give the cyclic magnesium diamide 2. By additional coordination of the two phosphine sites of the condensation product, 2 attains a tricyclic structure. An unchanged DBN molecule completes the pentacoordination of the magnesium atom. The structure of product 2 has been determined by single crystal X‐ray diffraction. © 2003 Wiley Periodicals, Inc. Heteroatom Chem 14:197–199, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.10122