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Cyclization of aryl/alkyl phosphonic dichlorides (2a–f) with phenylboronic acid/K2CO3/I2 in dry toluene at 60–70 °C afforded 2,6-diaryl/alkyl-4,8-diphenyl-1,3,5,7,2λ 5,6λ 5,4,8-tetraoxadiphosphadiborocane-2,6-diones (3a–f).
The authors thank the Council of Scientific and Industrial Research, Human Resources Development Group, Government of India, New Delhi, for providing financial assistance (01/2347/09/EMR-II).
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