Organic Chemistry Data – Lots of very useful resources including the Hans Reich Collection
Mayr Database – Electrophilicity/Nucleophilicity Scales
H Reich Webpage – pKa and other useful data
Chemistry Reference Resolver – quick reference finder
Named Reactions (Organic Chemistry Portal)
Top Pharmaceuticals Charts (Jón Njarðson Group)
Sheffield Chemputer (Isotope patterns etc)
mcgarrigleresearch 