Aminosubstituted disilanes: Synthesis by unsymmetrical and symmetrical reductive coupling

✍ Scribed by Joachim Heinicke; Steffen Mantey

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 190 KB
• Volume: 9
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/(sici)1098-1071(1998)9:3<311::aid-hc6>3.0.co;2-c

✦ Synopsis

The reductive coupling of chlorotris(diorganylamino)silanes 1 with chlorotrimethylsilane by the action of lithium in THF provides for steric reasons, an easy access to unsymmetrical aminosubstituted disilanes (R 2 N) 3 Si-SiMe 3 3. Similarly, crosscoupling to give pentakis(diethylamino)disilane 4 is observed between 1a and bis(diethylamino)chlorohydridosilane 2a on treatment with lithium. In reactions of the less bulky bis(diorganylamino)chlorohydridosilanes 2 with ClSiMe 3 and Li, however, the symmetrical coupling is preferred and affords SiHfunctional substituted (R 2 N) 32 HSi-SiH(NR 2 ) 2 5. Aminosubstituted disilanes 3-5 are useful starting materials for modification of disilanes or syntheses of silicon heterocycles via generation and trapping of aminosilylenes, as exemplified by diethylaminosilacyclopent-3-ene 6a.