ChemRefer

http://www.chemrefer.com/

It doesn’t get any simpler. Type in your keywords and get links to the matching full-text PDFs from the primary literature. A simple search interface makes constructing the right query easy to master without special training. Search results are laid out in the familiar style of the big general purpose search engines to aid navigation. Each search result link takes the user off the ChemRefer website to the original website source. Search results are designed to contain only the minimum and required metadata to allow the user to decide on their relevancy quickly. They are also entirely 'organic' in that they are all ranked according to the same scoring algorithm with no advantage being given to particular articles