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. 2019 Oct 21;9(58):33853–33862. doi: 10.1039/c9ra06170c

Phosphotungstic acid catalyzed regio-selective O-4 ring opening reactions.

graphic file with name c9ra06170c-u3.jpg
Entry SM H3[P(W3O10)4] (equiv.) Product Yield
1 5a 0.05 6a 31%
2 5a 0.1 6a 80%
3 5a 0.2 6a 79%
4 5b 0.1 6b 82%
5 5c 0.1 6c 86%
6 5d 0.1 6d 79%
7 5e 0.1 6e 69%
8 5f 0.1 6f 80%