Double proton transfer in crystals of 1,3,4,6,7,8-hexahydro-2H-pyrimido[1, 2-a] pyrimidine (hppH):13C and15N CPMAS NMR study of (hppH)2

1. Coles, M.P.
2. Khalaf, M.S.
3. Claramunt, R.M.
4. Garća, M.A.
5. Alkorta, I.
6. Elguero, J.