Diphenyl diselenide (PhSeSePh) was effective as a pre-catalyst for the vicinal dichlorination of α,β-unsaturated phosphonates with sulfuryl chloride. The reaction conditions were mild and the desired products were formed in up to 93% yield and moderate diastereoselectivity (10 : 1). The important diphenylselenium dichloride intermediate was obtained and characterized by X-ray crystallography.
X. Zeng, C. Gong, J. Zhang and J. Xie, New J. Chem., 2016, 40, 7866 DOI: 10.1039/C6NJ00658B
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