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With this approach, Chemspace makes it possible to cover the needs of various medicinal chemistry programs and pharmaceutical researches including lead oriented combinatorial synthesis, hit-to-lead and lead optimization projects, as well as the needs of synthetic chemistry providing reagents for click chemistry, couplings, and photoredox transformations. The products in our database range from widely demanded classes of chemical building blocks like amines and carboxylic acids to exclusively rare compounds like sulfoximines and phenyl bioisosteres. With more than 582 million chemical building blocks from numerous suppliers, Chemspace offers the most comprehensive coverage of the chemical space available through a single source.Įquipped with powerful database functionality and various search options including Exact Match, Substructure, and Similarity, Chemspace provides researchers with an ultimate tool for decision making and chemicals procurement. Therefore, we have gathered the largest database of chemical building blocks so that you can conveniently search tens of millions of compounds within a few seconds and enjoy the best purchasing experience. As more come up, I’ll add them.The Comprehensive Collection of Chemical Building BlocksĪt Chemspace, we aim to deliver chemical building blocks to fulfill the needs of your projects. Here’s a table with some representative examples. There are some additional tricks with structural formulas that don’t involve brackets but are still important to know.Ĭarboxylic acids are represented by CO 2H (or COOH)Įsters are represented by CO 2R (or COOR) Some Representative Examples That helps to highlight a useful rule of thumb: look to the left of the bracket t o see which atom it’s attached to. For example CH 3CH(CH 3)CH 2CH 3 depicts a 4-carbon chain where the CH 3 in brackets is directly attached to the carbon before it. So CH 3C(O)CH 3 implies that the second carbon is double-bonded to an oxygen.īrackets can also be used to show branching. An equivalent (but less efficient) way to write the structure would be CH 3C(CH 3) 3.Ĭarbonyl oxygens (that’s C=O) can also be dealt with by putting them in brackets.
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So put the CH 3 groups in brackets and write C(CH 3) 4. C CH 3 4 is a little better but having those numbers next to each other is confusing (it looks like CCH 34). You wouldn’t write it CH 3CH 3CH 3CH 3C writing it like that implies a chain, and each of those CH 3 groups can only be attached to one thing. In organic chemistry, we use brackets in exactly the same way.Ĭonsider a case where you have four CH 3 groups attached to a carbon.
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Think back to math: there’s a difference between 4 + 2 * 3 and (4+2)*3. Using brackets is a no brainer.Ī second use of brackets is to reduce ambiguity. Much less work, right? Chemists gravitate towards solutions that involve doing less work. They can 1) reduce the amount of work, and 2) remove ambiguity from a structure.įor example, consider the difference between writingĬH 3CH 2CH 2CH 2CH 2CH 2CH 2CH 3 and CH 3(CH 2) 6CH 3. What’s The Purpose Of Using Brackets?īrackets help in two ways. In between those two extremes, there are a few tricky things to keep track of. It’s pretty much impossible to draw a useful condensed formula for something like morphine. It’s easy for simple hydrocarbons like propane: CH 3CH 2CH 3. In the days before word processors and graphics programs made it a cinch to include pictures, condensed formulae were the method of choice when you wanted to convey the structure of something without actually having to draw it. It’s a way of depicting molecules completely in text form.