Thermal reactions of (2,4,6-tri-butylphenyl)phosphonous dichloride and its derivatives; formation of 2,3-dihydro-1h-phosphinodes

✍ Scribed by Masaaki yoshifuji; Ichiro Shima; Kaori Ando; Naoki Inamoto

• Publisher: Elsevier Science
• Year: 1983
• Tongue: French
• Weight: 237 KB
• Volume: 24
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(00)81569-5

✦ Synopsis

2,3-Dihydro-lH-phosphindole derivatives were obtained from thermal reactions of (2,4,6-tritert-butylphenyl)phosphonous dichloride in refluxing toluene, probably through cyclization involving phosphorus radicals with an adjacent methyl of o-tert-butyl groups.

Recently we reported that the reaction of ( 2,4,6-tri-tert-butylphenyl)lithium with phosphoryl trichloride gave a very crowded molecule, bis(2,4,6-tritert-butylphenyl)phosphinic chloride (&).'-' The reaction of (2,4,6-tri-tert-butylphenyl)lithium with phosphorus trichloride gave the corresponding phosphonous dichloride (2) almost quantitatively and the first stable phosphobenzene, E-bis(2,4,6-tri-tert-butylphenyl)diphosphene (A)," was obtained after dechlorination with magnesium metal. Very recently Majoral et al. 5 have reported a thermal reaction of bis(2,4,6-