Chemspider has launched C13-NMR predictions using the NMRSHIFTDB-database system. An (again critical) evaluation can be found at
I strongly recommend to take a textbook on Carbon-NMR and to rerun the examples I have shown on my webpage - otherwise you won't believe !
Before somebody starts a 'blog-war', please convince me that 1000's of literature citations claiming that a terminal CH3 in an alkyl-chain resonates at 14ppm, are wrong - I will immediately publish here an "Erratum".
In order to make the superior CSEARCH-technology available free-of-charge an interface can be found at
Every request is processed twice for your infomation - give it a try and enjoy yourself !
Stay tuned - more to come ! Wolfgang Robien