During these ten years, reactions which are carried out with the use of reagents adsorbed on alumina or silica gel have increasingly appeared and many compounds have become accessible in much simpler synthetic procedures. This new method for organic synthesis is based on the reasoning that high reactivity of reagents are reduced or adjusted by adsorption to produce high selectivity of the reagents toward substrates. In some cases nature of the reagents is completely changed by adsorption to result in appearance of new reactions. Use of silica gel as a mild and therefore selective acid catalyst for some condensation reactions is also important. Usually these reactions proceed selectively, cleanly, and give products in high yields. These newly developed reactions are reviewed, mainly from the standpoint of organic synthesis.