A Review on the Use of Deep Eutectic Solvents in Protection Reactions

Given the recent research on the application of eco-sustainable methods in organic chemistry, we have focused our attention on the derivatization processes for fundamental functional groups in organic chemistry, such as amino, hydroxyl and carbonyl groups. Protection reactions are needed to temporarily block a certain reactive site on a molecule. The use of green solvents in this context has made an excellent contribution to the development of eco-sustainable methods. In recent years, deep eutectic solvents (DESs) have had great success as a new class of green solvents used in various chemical applications, such as extraction or synthetic processes. These solvents are biodegradable and nontoxic. In this framework, a list of relevant works found in the literature is described, considering DESs to be a good alternative to classic toxic solvents in the protection reactions of important functional groups.

Evaluation of 5,000 endodontic treatments: incidence of the opened tooth

Five thousand endodontic cases treated by three endodontists were reviewed to determine the frequency of the need to leave teeth opened for drainage. The subsequent treatment of these teeth is described. Of the 5,000 cases reviewed, 518 were left open at some point during treatment. Two hundred and eighty-one cases (54.2 percent) remained closed after the first closure. Four hundred and twenty-six (82.2 percent) of the cases opened were eventually completed without surgical intervention. The need to prescribe antibiotics and perform a trephination is also stated.