Scheme 1.
Synthesis of α-containing pyrophosphates. (a) i. Me3Al, Cp2ZrCl2, DCM, 0°C, 18 hr; ii. (CH2O)n, 3 hr; (b) NCS, DMS, DCM, 0°C to rt, 2.5 hr; (c) (NBu4)3 HP2O7, ACN, 2.5 hr.
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