A novel method for the preparation of diborane from aluminum, ethyl chloride, boron oxide and hydrogen

✍ Scribed by Chengwen Zhao; Yijian Gu; Zunhong Rui; Zhongqiang Lin; Huoming Yin; Guangyu Lu; Yusheng Tao

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 344 KB
• Volume: 3
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/hc.520030312

✦ Synopsis

A novel method i s described for the preparation of diborane froin aluminum, ethyl chloride, boron oxide and hydrogen via three steps: deoxyalkylation of boron oxide, hydrogenation of triethylboron and liberation of diborane. The triethylboron was prepared froin aluwiinunt, ethyl chloride and boron oxide directly at 85-110°C in 88% yield, with aluminum trichloride as by-product in 95% yield. I n the presence of triethylamine and a hydrogen pressure of 130 kg/cin2, the triethylboron was hydrogenated at 200°C for 2 hours to produce borane-triethylamine complex in 92% yield. The borane-triethylaaniine complex was treated again at 80°C with the aluriiinuin trichloride collected from the first step to liberate diborane in 94% yield. The overall reaction yield was 76%.